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Delco Carburetor BULLETIN 9D-201 DATE: NOVEMBER, 1971 PAGE 1 FILE I N SERVICE "FIX" SECTION SERVICE INFORMATION SUBJECT: New Screw Kit Released for Monojet Carburetors PART NUMBER: 7041830 - Screw Kit /-- A new k i t is released which contains self-locking type screws for use on Monojet carburetors. The following screws are contained in the kit: 1 - Fast idle cam screw - 3 - Long air horn screws 3 - Short air horn screws 2 - Throttle body to bowl attaching screws 2 - Air cleaner bracket screws The special screws in the k i t have self-locking threads and are extremely useful on applications where excessive engine vibration or rough road operation can cause loose carburetor screws. CO. WD. 131,132:16,9X.9FR.9FD,9LA PRINTED I N USA. @ 1971. GENERAL MOTORS CORP. DELCO CARBURETOR SERVICE INFORMATION D 1 SUBJECT: P A R T NO. Quadrajet Secondary Main Well Seal 7041342 0 s? 9 < -I D BULLETIN 9D- 202 DATE November. 1971 PAQE 1 ED 0 = z0 " 4a FILE IN 90-200 SECTION C 0 x NO. , Some cases of fuel leakage at the secondary main well plugs have been reported o n early model quadra~ets. I f teakage occurs past the t w o plugs, it will fill the secondary well cavity i n the throttle body with fuel. The fuel then seeps through the throttle body-to-bowl gasket, and into the carburetor bores which could result i n rough idle or hard starting. T o stop this seepage o f fuel, a special Viton* seal i s available for service use only. Use of this seal avoids the possibility of cracking the bowl when installing some types of plugs available o n the market. I The procedure for installing this seal i s as follows: - 1. Remove carburetor from engine. 2. Disconnect accelerator pump rod. C rn r- 3. Remove float bowl-to-throttle body attaching screws and t w o long air horn attaching screws at rear of carburetor and remove throttle body. V) n < V) -4 4. Insert seal. part #7041342, into bottom of secondary well cavity i n throttle body. see figurc below. 5. Replace throttle b o d y t o float bowl, tightening attaching screws and t w o air horn screws evenly and securely. 6. Reconnect accelerator pump rod and install carburetor o n engine. NOTE: The t w o secondary well plugs should not be removed when performing this operation. 'Registered trade-mark E.I. duPont deNemours PRINTED I N U S A. 8 GENERAL MOTORS CORP. 12 DELCO CARBURETOR SERVICE I N F O R M A T I O N SUBJECT: BULLETIN 9D- 203 Quadrajet - Stripped Fuel Inlet Nut Repair DATE January, P A R T NO 7041634 and 7041635 PAGE 1974 1 of 2 FILE I N 9 D - 2 0 0 SECTION NO, 74-T-1 REPLACES 9D.203 DATED November. 197 Two fuel inlet adapter repair kits are released t o cover all Quadralet models. Applicat~onsare as follows: K i t Part No. Use on Following Ouadrajet Applications 7041634 1966-71 Buick' 1966-71 Oldsmobile 1967-71 Pontiac 1965-71 Chevroiet - 318" fuel line I 'On 1966 Buick use the original inlet nut with nipple adapter 7041635 1967-71 Cadillac 1966-67 Chevrolet - 5/16" fuel line F U E L I N L E T GASKET E N D &"EL PI.IIG FUEL ! N L E T G A S K E T F U E L l N L E T ADAPTER F U E L I N L E T ADAPTER BLOW O F F SPRlNG NOTE I N L E T N U T GASKET ro oullldr dlsmeler L INLET N U T 0, f u l l , " , e l atlBO1I: SIDE I N L E T ,- Enlacqe i n i p l nut hole ,n "lug r e l a l n r . ,*LET N U T GASKET INSTALLATION INSTRUCTIONSOJ (OSS - 0051) CO:S, 131, 1 3 2 : G - K , FD, WD, X REVERSE S (OVER) s . PRINTED IN U S A GENERALMOTORSCORP INSTALLATION OF FUEL INLET ADAPTER 1. Remove fuel inlet nut, filter and spring and discard all pans. 2. Blow out fuel inlet cavity in float bowl making sure it is free of chips and foreign material.. 3. Apply Loctite Primer "T" to threaded area of bowl and on inlet nut adapter. Allow Primer "T" to dry on threads. Note: The use of Loctite adhesive #75 and "T" Primer is t o assure a perma. nently sealed fitting in the carburetor bowl and no attempt should be made to remove adapter. IMPORTANT Loctite Primer "T" and #75 adhesive sealant is available through pans jobbers and dealers. 4. Install one inlet nut gasket on adapter. Coat the threads of adapter which fit into float bowl with Loctite #75. Use extreme caution so Loctite is only on adapter threads. Note: On 1966 Model 4MV carburetors the fuel passage end plug retainer should be used i f needle and seat Modification Kit #7036775 has been installed. 5. lnstall adapter i n bowl and torque t o 50 ft. Ibs. 6. Blow out bowl cavity b y blowing air through adapter. 7. Install new filter spring, filter and inlet nut with gasket. Note: Care should be taken when installing inlet nut, filter and gasket not t o move adapter as it takes 5 t o 10 minutes for Loctite t o set up. 8. Connect fuel line. 9. Adjust engine t o specified R.P.M. DELCO CARBURETOR SERVICE INFORMATION SUBJECT: SERVICE REPLACEMENT IDLE LIMITER CAPS PART NO. All Carburetors BULLETIN 9D- 204 DATE November, 1973 PAGE 1 FILE I N 9 D - 2 0 0 SECTION NO. - 74-1-2 - - - .. Replaces 9D-204 dated April, 1972 Special attention is directed t o vehicle manufacturer's recommendations for idle speed and idle mixture adjunmenrs. Complete effect~venessof the Exhaust Emission Control system, on vehicles so equipped, depends upon idle speed and idle mixtures being set t o factory specifications. The idle mixture is preset ana sealed at the factory with black plastic limiter caps. The idle mixture caps should not be removed in the field unless idle mixture adjustment is required after cleaning or major carburetor repair. I f the idle needle caps are removed the idle mixture should be reset according t o instructions on the decal in the engine compartment or as outlined in the service manual. Red plastic limiter caps were originally used for replacemenr after field adjustment and were supplied separately and in the repair k i t s . x r % d limiter *replacement is no longer required afrer field adjustment, so they have been discontinued as a replacement part. (OSS - 0 0 8 5 ) CO:9, 131, 132:G-K, WD, F D , X PRINTED IN U S A O GENERAL MOTORS CORP. DELCO CARBURETOR SERVICE INFORMATION SUBJECT: PART NO. MONOJET CARBURETOR CHOKE SHAFT AND LEVER REPLACEMENT A l l 1968 and l a t e r E b n o j e t c a r b u r e t o r s " BuLLlEflN 9D- 205 DATE August, I rn : < w 1972 0 r m + PAGE I FILE I N 9D-200 SECTION NO, 72-T-1 A l l 1968 Monojet c a r b u r e t o r s have a s l o t i n the f a s t i d l e cam t o a l l o w f r e e movement of t h e choke rod i n t h e cam. The upper choke rod l e v e r has a standard h o l e f o r attachment of t h e upper end of the choke rod t o t h e choke shaft. I f choke s h a f t replacement i s necessary, i t should be s e r v i c e d w i t h choke s h a f t and l e v e r assembly, P a r t No. 7034009. The upper choke rod l e v e r i s s t i l l s e r v i c e d s e p a r a t e l y under P a r t Number 7034056. - 'I On 1969 and l a t e r models t h e upper choke l e v e r i s s l o t t e d f o r f r e e movement of t h e choke rod and t h e f a s t i d l e cam has a standard h o l e . On these models a choke s h a f t and l e v e r k i t . P a r t No. 7036973, must be used i f necessary t o r e p l a c e t h e upper choke rod s l o t t e d l e v e r o r t h e choke s h a f t and c o i l l e v e r assembly. The new k i t , P a r t Number 7036973, c o n t a i n s a choke s h a f t w i t h t h e s l o t t e d choke l e v e r spun on one end and a separate choke c o i l rod l e v e r w i t h an a t t a c h i n g screw. 1968 Models 1969 and l a t e r models - (OSS 0519) CO. WD. 131.132: lO.WX.9FR.9FD.9LA PRINTED I N U S A . 8 OENERAL MOTORS CORP. i ,DELCO CARBURETOR SERVICE I N F O R M A T I O N , - SUBJECT: Monojet Main Well Plug K i t PART NO. 7041848 Assortment K i t B U L L E T I N 9 D - 200 The assortment kit has been released t o the field for replacement of the main well plug where necessary. The following are contained in the kit: DATE January, 1974 PAGE 1 of 2 FILE I N 99-200 SECTION NO. 74-1-1 Replaces9D~200 Dated November, 1971 Quantity Part No. Identification Color 10 5 5 10 7030470 703047 1 7030472 7030473 No bleed hole ,023" bleed hole ,030" bleed hole ,036" bleed hole Silver Silver Copper Black Some plugs have bleed holes and some do nor. - -- I t IS very important that the correct plug be used in each particular carburetor model The follow~nglist gives the correct plug application for each carburetor unlt: 1968 Carb. No. 7028006 7028007 7028008 7028009 7028010 702801 1 7028012 7028013 7028014 7028015 7028017 7028047 7028057 7028065 7028067 7028082 7028083 7028180 7028181 7028182 Plug Color Black Black Black Black Black Black Black Black Black Black Black Silver (bleed hole) Black Silver (bleed hole) Copper Black Black Black Black Black (ass - 0051) CO:9, 131, 132:G-K, FD, WD, 1969 Carb. No. 7029007 7029008 702901 1 7029012 7029014 Plug Color Silver (no hole) Black Silver (no hole) Silver (no hole) Silver (no hole) Silver (no hole) Silver (no hole) Silver (no hole) Silver (no hole) Silver (bleed hole) Black Copper Copper Copoer Copper 1970 Carb. No. 7040007 7040008 704001 1 7040012 7040014 7040017 7040021 7040022 7040025 7040026 (OVER) X 1 Plug Color Silv. (bld. hole) Black Silv. (bld. hole) Silv. (no hole) Silv. (no hole) Silv. (no hole) Silv. (bld. hole) Silv. (no hole) Silv. (bld. hole) Silv. (no hole) PRINTED IN U S A @ GENERAL MOTORS COUP. 1 I BULLETIN 8D-200 Pap2 1971 Carb. No. Plug Color Silver (bleed hole) Silver (bleed hole) Silver (bleed hole) Silver (no hole) Copper Copper Silver (bleed hole) Silver (no hole) 1972 Carb. No. 7042011 7042012 7042014 7042017 7042021 7042022 7042023 7042024 7042025 7042026 7042984 7042987 7042991 7042992 7042993 7042994 7042995 Plug Color Silver (bleed hole) Silver (no hole) Silver (bleed hole) Silver (bleed hole) Silber (bleed hole) Silver (bleed hole) Copper Copper Silver (bleed hole) Silver (no hole) Silver (bleed hole) Silver (bleed hole) Silver (bleed hole) Silver (bleed hole) Copper Copper Silver (bleed hole) 1973 Carb. No. 7043009 7043012 7043014 7043017 7043021 7043022 7043023 7043024 7043025 7043026 7043312 7043323 7043324 7043326 7043333 7043334 Plug Color Silv. (bld. hole) Silv. (no hole) , Silv. (bld. hole) Silv. (bld. hole) Silv. (bld. hole) Silv. (bid. hole) Copper Copper Silv. (bld. hole) Silv. (no hole) Silv. (bld. hole) Copper Copper Silv. (bld. hole) Copper Copper Installation: The main well plug is a press f i t and is located in top of main well as shown. To install usea tool made from a piece of 5/16" steel gas line tubing cut t o 3" length. The inside diameter of gas line is approximately 114". I f a piece of regular tubing is used, make sure the inside diameter is the above dimension. Remove burrs from end of tube. 1. 2. Removecarburetor from engine; then remove air horn assembly from float bowl. Start new main well plug into top of main well with fingers. Make sure sides of plug are vertical with hole in main well. Using the 3" piece of 5/16" steel gas line and hammer, carefully drive main well plug inward until bead on plug rests on top of main well casting. SEE DRAWING. Do not use any type sealer on main well plug as it may get into fuel CAUTION: channels. 3. DELCO CARBURETOR SERVICE INFORMATION SUBJECT: PART NO. 1D CORRECT l NSTALLATI ON OF FLOAT NEEDLE PULL CLl P A l l Quadrajet Carburetors BULLETIN 9D- 206 DATE PAGE August , 1972 1 FILE I N 90-200 SECTION NO. 72-T-2 r r n P D -0 u < v, Z V) , R e p o r t s have been r e c e i v e d o f i n c o r r e c t i n s t a l l a t i o n o f t h e f l o a t If n e e d l e p u l l c l i p o n t h e f l o a t arm d u r i n g f i e l d replacement. t h e c l i p i s n o t i n s t a l l e d as recommended, c a r b u r e t o r f l o o d i n g can result. I t i s r e p o r t e d t h a t t h e end o f t h e p u l l c l i p i s b e i n g i n s t a l l e d t h r o u g h t h e h o l e s i n t h e t o p o f t h e f l o a t arm above t h e n e e d l e . These a r e l o c a t i n g h o l e s used f o r m a n u f a c t u r e o f t h e f l o a t arm and a r e & t o b e used f o r t h e p u l l c l i p . ,--- C o r r e c t i n s t a l l a t i o n o f t h e f l o a t n e e d l e p u l l c l i p , i s t o hook t h e c l i p o v e r t h e edge of t h e f l a t on f l o a t arm f a c i n g t h e f l o a t pontoon, as shown. HOOK CLIP OVER EDGE O F /. F L O A T A R M , - (OSS Note: The o n l y e x c e p t i o n t o t h i s i s when u s i n g t h e f l o a t n e e d l e m o d i f i c a t i o n k i t - P a r t Number 7036775. T h i s n e e d l e p u l l c l i p hooks o v e r t h e o p p o s i t e edge o f f l o a t arm as shown o n i n s t r u c t i o n sheet i n t h e k i t . - 0519) CO. WO. 1 3 1 . 1 3 2 : 1 6 . 9 X . 9 F R . 9 F D . 9 L A PRINTED I N U S A. 0 GENERAL MOTORS CORP. DELCO CARBURETOR SERVICE INFORMATION SUBJECT: PART NO. 1 BULLETIN 9D- PUMP ROD REMOVAL ON ROCHESTER QUADRAJET CARBURETORS 207 DATE August. 1972 PAGE 1 FILE IN 9D-200 SECTION ~ 1 1970 1 and l a t e r models NO. 72-T-3 I- n % 0 C It 0 Z m The above model c a r b u r e t o r s use a c l i p l e s s pump r o d t o prevent the p o s s i b i l i t y o f r e t a i n i n g c l i p s belng a c c i d e n t a l l y l e f t o f f o r becoming l o s t due to improper i n s t a l l a t i o n . Reports have been received t h a t t h e pump rod i s b e l n g b e n t t o remove the r o d from upper pump l e v e r when removing t h e a i r horn fran f l o a t bowl. T h i s i s a bad s a f e t y p r a c t i c e as t h e pump rod w l l l be weakened and a l s o may cause a b i n d due t o n o t b e i n g a l i g n e d p r o p e r l y a f t e r bending. C o r r e c t removal o f t h e pump rod shouid be aone by d r i v i n g the small r o l l p i n r e t a i n i n g t h e upper pump l e v e r inward (towards a i r cleaner boss) u n t i l t h e l e v e r can be removed fran boss on a1 r horn. Then remove upper pump l e v e r , pump rod and a i r horn assenbly. To i n s t a l l pump rod a f t e r a i r horn i n s t a l l a t i o n , i n s t a l l pump rod t o t h r o t t l e l e v e r and upper end o f rod t o upper pump l e v e r . Then i n s e r t upper l e v e r I n t o boss on a i r horn and push r o l l p i n back through h o l e i n pump l e v e r u n t i l t h e o u t e r end o f p i n I s f l u s h w i t h boss on a i r horn. See sketch. I (OSS DRIVE PIN INWARD TO REMOVE PUMP LEVER - 0519) PRINTED I N U S A. CO. W D . 131. 132: 1 6 . 9 X . 9 F R . S F D . 9 L A 0 GENERAL MOTORS CORP. DELCO CARBURETOR SERVICE INFORMATION ,-.. SUBJECT: QUADRAJET A I R VALVE CAM REPLACEMENT BULLETIN 9D- 209 PART NO. 7035344 A i r V a l v e and S p r i n g K i t DATE PAGE August, 1972 I FILE I N 9D-200 SECTION NO. 72-1-2 A cam and s p r i n g k i t i s a v a i l a b l e f o r Q u a d r a j e t a i r v a l v e cam repair. The k i t i n c l u d e s t h e cam, s p r i n g , s e t screw, p i n , and the a i r v a l v e s h a f t seal plug. T o r e p l a c e cam: I . Remove a i r v a l v e screws 2. Remove a i r v a l v e s 3. Remcve s e t screw f o r a d j u s t m e n t p i n 4. Remove a d j u s t m e n t p i n 5. Remove wind-up s p r i n g 6. D r i v e o u t a i r v a l v e s h a f t 7. I n s t a l l new cam 8. Reverse above p r o c e d u r e f o r re-assembly 9. I n s t a l l new s h a f t s e a l 10. R e f e r t o s p e c i f i c a t i o n f o r s e t t i n g a i r v a l v e wind-up. ( ~ u l l e t i n9 ~ - 2 1 0 ) P R I N T E D IN U S A @ GENEAALMOTORSCORP DELCO CARBURETOR SERVICE I N F O R M A T I O N SUBJECT: QUADRAJET A t R VALVE CAM RE PLACEMENT BULLETIN 9DDATE PART N O . 7035344 A i r V a l v e and S p r i n g K i t PAGE 209 August, 1972 1 FILE IN 9D-200 SECTION NO. 72-1-2 A cam and s p r i n g k i t i s a v a i l a b l e f o r Q u a d r a j e t a i r v a l v e cam r e p a i r . The k i t i n c l u d e s t h e cam, s p r i n g , s e t screw, p i n , and the a i r v a l v e s h a f t seal plug. To r e p l a c e cam: 1 . Remove a i r v a l v e screws 2. Remove a i r v a l v e s 3. Remove s e t screw f o r a d j u s t m e n t p i n 4. Remove a d j u s t m e n t p i n 5. Remove wind-up s p r i n g 6. D r i v e o u t a i r v a l v e s h a f t 7. I n s t a l l new cam 8. Reverse above p r o c e d u r e f o r re-assembly 9. I n s t a l l new s h a f t s e a l 10. R e f e r t o s p e c i f i c a t i o n f o r s e t t i n g a i r v a l v e wind-up. ( B u l l e t i n 9D-210) (OSS - 0588) CO:9,131,132:G-K,WD,FD,X - -- - ~ O -~ PRINTED IN u s A GENERAL MOTORS COUP. - -~ ~ ~ I DELCO CARBURETOR SERVICE INFORMATION 1 D ~ C O SUBJECT: PART NO. A i r Valve Windup Setting Procedure and Specifications. BULLETIN 9D- 210 DATE November, 1 9 7 3 All Quadrajets PAGE 1 of 2 FILE IN 90-200 SECTION NO. 72-1-3 Replaces 9 D - 2 1 0 Dated August, 1972 ADJUSTING . .- .- SCREW --+ AIR VALVE SPRING ADJUSTMENT MODEL YEAR CARBURETOR NO. Buick '66 '67-'69 '70-'72 '73 ALL A A AIR VALVE WINDUP (TURNS) 518 112 711 6 711 6 -704x241)-242-243 ll/lfi 7, "" -,, '69 '70 '71-'72 '73 ALL ALL ALL 71 '74 Ct.:vrolet '655'66 '67 '68 '69 (0% - 005 1) C 0 : 9 , 131, 132:G-K, FD, WD,X 7/16 112 5/16 318 318 1 12 5/16 1 718 318 718 13/16 7/16 7043230-231-233 7043232 7044230-233-235-530 7044232-532 7044234 ALL ALL 7028207-208-21 2-21 9-229 128209-210-211-21: 7029200-21 7029201-2( (OVER) - - - '-218 PRINTED IN U S A GENERAL MOTORS CORP. -- - - BULLETIN 9D-21 Page 2 MODEL Chevrolet Cont'd. YEAR '70 '7 1 '72 '73 '74 Oldsrnobile '6 6 '6 7 '68 '69 '70 '71 '72 '73-'74 Pontiac '74 '66-'69 '70 '7 1 '72 '73 '7 4 CARBURETOR NO. 7040200-202-203-208-21 3-500-502-503-'508 704051 1-512-513 7040201-204-205-206-207-221-501-504-505 7040506-507-508-521 7041200201 -202-203-204-205-208-209-21 1 7041212-213 7041206 7042200-201 -204-205-209-21 2-21 5-216-21 7 704221 8-219-220 7042202-203-208-210-21 1-902-903;910-911 7042206-207 7043200-201-207 7043215-502-503-508-510-51 1-515 7043212-213-217-224-512-513 7043202-203-21 0-21 1-21 9 7044202-203-206-207-21 3-214-215-216-218-219 7044224-502-503-506-507-51 3-514-51 5-516 7044518-519 7044201-212-217-221-223-225-227-505-512 7044517-520-550 7044208-209-210-21 1 704226-526-527 7026250-256-7036250 7026254-7036254 7026255 70271 56-157 7027036-135-153 7028250 7028251-252-255 7029250 7029251-252-253-254-255 7040251-252-253-255-256-257-258-551-552 7040554-555 7040250-550 7041-252-253-; 7041 250 7042251-252-9 53 7042250-950 7043250-255-256-257 7043251 -252-253-254-2! 7044557-558-559 ALL 7040577 7040262-263-264-267-268-271 -274272; 7040277-562-563-564-567-568-572-575-5; 7040265-266-270-273-565-566-570-573 7041 267-268-270 7041 262-263-264-271 7042262-270-273 7042264 7042267 7042263 7043263 7043265-274 7043262-272 7043264 7044262-267-272-560 7044266-268-21 7044270-273 7044274 - AIR VALVE WINDUP (TURNS1 7116 13116 7116 13116 7116 112 11/16 11116 112 1 314 , 718 7/16 1 314 314 112 518 314 112 112 314 112 314 314 112 314 i 12 314 112 112 314 314 112 318 . - 7/16 314 1I 2 7116 7116 518 9116 11116 518 9116 318 1 318 112 314 9116 / 2 - PI ~ ' c DELCO CARBURETOR O SERVICE INFORMATION I SUBJECT: PART NO. USE OF INCORRECT THROTTLE BODY TO FLOAT BOWL GASKET QUADRAJET - 1970 and L a t e r Q u a d r a j e t C a r b u r e t o r s BULLETIN 90- 21 1 r DATE November, 1972 PAGE 1 0 9 FILE IN 90-200 SECTION NO, 72-1-4 c r m 0 - 'A 0 Z U1 - F i e l d r e p o r t s , a l o n g w i t h r e t u r n e d samples, i n d i c a t e servicemen somet i m e s a r e s u b s t i t u t i n g t h e wrong t h r o t t l e body t o f l o a t bowl g a s k e t o n 1970 and l a t e r model Q u a d r a j e t c a r b u r e t o r s . When t h i s s u b s t i t u t i o n i s made, vacuum l e a k s o c c u r c a u s i n g rough i d l e due t o a i r b y - p a s s i n g t h e p r i m a r y t h r o t t l e v a l v e s t h r o u g h t h e c a n i s t e r purge passage i n t h e t h r o t t l e body because t h e gasket w i l l n o t s e a l t h i s passage. T h e r e f o r e , i n no case should t h e wrong t h r o t t l e body t o f l o a t bowl gasket be used on 1970 and l a t e r model Q u a d r a j e t c a r b u r e t o r s . The d i f f e r e n c e between t h e t h r o t t l e body t o bowl g a s k e t s i s shown below: UNSEALED CANISTER PURGE PASSAGE SEALED CANISTER PURGE PASSAGE L I I F?l ~ 3 9 4 ~ DELCO CARBURETOR ~ 0 SUBJECT: "LOADED" PART NO SERVICE INFORMATION BULLETIN 90- QUADRAJET FLOATS DATE PAGE 1967-70 BUI CK, CHEVROLET AND PONT l AC QUADRAJET March, 21 2 1973 I FILE I N 9D-200 SECTION Some cases of loaded f l o a t a s s e m b l i e s have been encountered i n t h e above Q u a d r a j e t c a r b u r e t o r s . I f a f t e r s e t t i n g t h e i d l e speed t o s p e c i f i e d R.P.M., main d i s c h a r g e n o z z l e d r i p o r e x c e s s i v e s t a l l i n g i s encountered, If float e s p e c i a l l y on s t o p s , check t h e f l o a t l e v e l s e t t i n g . s e t t i n g i s O.K., check f o r a f l o a t "loaded" w i t h f u e l . I f t h e f l o a t pontoon has absorbed f u e l i t w i l l f e e l h e a v i e r t h a n a new f l o a t o f t h e same p a r t number o r w i l l sometimes show wetness when squeezed between t h e thumb and f i n g e r . I f these c o n d i t i o n s a r e found, r e p l a c e t h e f l o a t assembly. PRINTED I N U S A CO, WD 1 3 1 1 3 2 1 6 . 9 X 9FR 9FD.9LA 0 QENERALMOTORSCDRP ~ . . ~ - -~ DELCO CARBURETOR SERVICE INFORMATION - SUBJECT: VAPOR CANISTER PART NO. 7041344 PURGE VALVE REPAIR K I T BULLETIN 9D- 213 PURGE VALVE REPAIR DATE March I973 PAGE 1 FILE I N 9D-200 SECTION ,/~ - The p u r g e v a l v e l o c a t e d on t h e t o p o f t h e f u e l v a p o r c o l l e c t i o n c a n i s t e r , used on some a p p l i c a t i o n s , can be r e p a i r e d w i t h o u t r e p l a c i n g the complete vapor c a n i s t e r . (See p h o t o ) The r e p a i r k i t , P a r t No. 7041344, c o n s i s t s ' of t h e f o l l o w i n g : 1 1 1 1 - Diaphragm c o v e r Diaphragm S p r i n g R e t a i n e r Washer Diaphragm S p r i n g Service o f t h e purge valve i s n o t a r o u t i n e m a i n t e n a n c e i t e m and s h o u l d b e p e r f o r m e d i f damaged o r p a r t s a r e m i s s i n g . I n s t a l l p a r t s i n o r d e r shown i n p h o t o . Make s u r e s p r i n g i s s e a t e d i n m e t a l r e t a i n e r and d i a p h r a g m l a y s f l a t between p u r g e v a l v e f l a n g e on c a n i s t e r and diaphragm cover. Snap d i a p h r a g m c o v e r i n p l a c e a l i g n i n g vacuum p i c k - u p t u b e w i t h vacuum hose. P R I N T E D I N U.S.A. CO. WD. 131. 132: 1 6 . 9 X . 9 F R . 9 F D . 9 L - -- - - --- W G E N E H A L MOTORS CORP. --- ~ ~ - p~ -- ,,-. DELCO CARBURETOR SERVICE INFORMATION SUBJECT: REMOVAL OF CLl PLESS PUMP PLUNGER ASSEMBLY FROM INSIDE PUMP LEVER BULLETIN 9 ~ -214 PART NO. ALL MODEL 2GV ( 2 BARREL) CARBURETORS USING INSIDE RETAINING LEVER DATE APRl L 1973 PAGE 1 NO. 73-1-2 ,-~ When removing t h e pump p l u n g e r assembly f r o m t h e i n n e r pump l e v e r on t h o s e models n o t u s i n g a r e t a i n i n g c l i p , i t i s n e c e s s a r y t o f i r s t remove t h e i n n e r pump l e v e r f r o m t h e pump s h a f t b y l o o s e n i n g s e t screw on i n n e r l e v e r . Then remove i n n e r pump l e v e r from pump s h a f t . R o t a t e pump p l u n g e r assembly u n t i l upper end o f p l u n g e r r o d s l i p s o u t of h o l e i n i n n e r pump l e v e r . CAUTION: Do n o t remove the r e t a i n i n g r e t a i n i n g arm cases, allow lever. pump p l u n g e r assembly b y b e n d i n g arm on i n n e r l e v e r . I f bent, the can cause b i n d i n g , jamming and i n some t h e pump assembly t o f a l l o u t o f t h e ,~ -~ /- PRINTED I N U.S.A. @ G E N E R A L MOTORS CORP. CO. W D . 1 3 1 . 1 3 2 : 1 8 . 9 X . 9 F R . 9 F D . 9 L A - - - - - ~ - D E L C O CARBURETOR Delco SERVICE INFOR M A T I O N SUBJECT: QUAORAJET CARBURETOR SECONDARY W I N WELL SEAL PART NO. 7041342 Reference S e r v i c e " F i x " d a l e d November 1971. BULLETIN 90- 215 DATE July. 1973 PAoE 1 B u l l e t i n 90-202 FILE IN 9D-200 SECTION NO. 73-1-3 F i e l d r e p o r t s i n d i c a t e servicemen a r e replacing t h e f l o a t bowl assembly a n d / o r a d d i n g secondary main w e l l p l u g s e a l 7041342 i n t h e t h r o t t l e body c a v i t y (see i l l u s t r a ~ i o nbelow), on Q u a d r a j e t c a r b u r e t o r s t h a t use t h e s o l i d aluminum "spun-in" secondary main w e l l p l u g s , t o c b r r e c t what appears The presence of f u e l i n t h e t o be " l e a k i n g secondary main we1 l plugs". c a v i t y a c t u a l l y i s due t o "weeping a c t i o n " whereby f u e l f r o m t h e secondary n o z z l e s , d u r i n g engine o p e r a t i o n , seeps b y t h e t h r o t t l e body t o bowl gasket t o p a r t i a l l y f i l l t h e c a v i t y i n t h e t h r o t t l e body. Fuel I n the t h r o t t l e body c a v i t y below t h e "spun-in" main w e l l p l u g s w i l l n o t a f f e c t o p e r a t i o n and t h e f l o a t bowl assembly s h w l d n o t be r e p l a c e d o r t h e secondary main ell p l u g s e a l 7041342 used. I f leakage o f f u e l a t t h e secondary main w e l l p l d g s i s suspected, p l a c e t h e bowl on t h e bench on a d r y , c l e a n towel and f i l l t h e bowl w i t h f u e l . After about 5 m i n u t e s . c a r e f u l l y l i f t t h e bowl c h e c k i n g f o r dampness on t h e t o w e l i n t h e secondary maih w e l l p l u g l o c a t i o n . I f 1 e a k a g e . i ~e v i d e n t , t h e 7041342 seal may be i n l t a l l e d i n t h e t h r o t t l e body c a v i t y . P R I N T E D IN U S A 0 GENERALMOTORSCORP I, r 2 AC-DelCO Divls~onot General C~lWral!oo Service Bulletin MDtOiS n Bulletin 9D-216 ~~t~ November, 1974 one 74-T-1 F i l e i n 9D-200 S e c t i o n Page No. SUBJECT: ,-. Q u a d r a j e t Secondary Main Well P l u g S e a l K i t 17052246 The s e c o n d a r y main w e l l p l u g r e p a i r k i t i s r e l e a s e d f o r u s e on e a r l y model c a r b u r e t o r s which u s e t h e b r a s s cup p l u g o r s o l i d aluminum p l u g w i t h o u t s p i n n i n g . T h i s k i t s h o u l d n o t b e used on l a t e r models w i t h t h e 7, spun-in" t y p e s e c o n d a r y main w e l l p l u g . B e f o r e i n s t a l l i n g p l u g k i t , check f o r l e a k s a s f o l l o w s : .- 1. Disassemble c a r b u r e t o r . 2. P l a c e f l o a t bowl on s t a n d and f i l l h a l f f u l l o f f u e l . 3. Observe p l u g a r e a f o r f u e l s e e p a g e . 4. I n p l u g s l e a k , remove e a r l y t y p e b r a s s cup p l u g s w i t h "Easy-out". I f p l u g i s s o l i d t y p e ( w i t h o u t s p i n n i n g ) , u s e a 3/16" s t o p d r i l l and d r i l l h o l e 114'' deep i n c e n t e r o f o l d p l u g . Use "Easy-out" and remove Plug. CAUTION: I- II 2r- Do n o t d r i l l t h r o u g h p l u g a s c a s t i n g may b e damaged i n w e l l a r e a . Blow o u t c a s t i n g t o remove d i r t and c h i p s . 7 5. I n s t a l l r u b b e r "0" r i n g s e a l i n t o groove i n new p l u g . Lube assembly w i t h l i g h t e n g i n e o i l , t h e n c a r e f u l l y d r i v e p l u g i n t o main w e l l , chamfered end down. Top of p l u g s h o u l d b e f l u s h w i t h c a s t i n g . L i g h t l y stake i n place. NEW PLUG c RUBBER SEAL FLUSH LIGHTLY -STAKE AS Z H O W N II I FLOAT BOWL I) INSTALLATION SECONDARY MAIN WELL PLUGS AC-Delco Dlvlslonof General Motors Corpomtlon Delco Carburetor Service Bulktin Bulletin 90.277 Date Page 12/1/76 10f5 76-1-1 NO. FILE I N 90-200SECTlON SUBJECT: IDLE MIXTURE ADJUSTMENT PART NO. ALL 1977 G.M. VEHICLES Idle mixture screws have been preset at the factory and capped. Do not remove the caps during normal engine maintenance. Before suspecting the carburetor as the cause of poor engine performance or rough idle, check ignition system including distributor, timing. spark plugs and wires. Inspect air cleaner, evaporative emission system, EFE system, PCV system, EGR system, and engine compression. Also inspect intake manifold, vacuum hoses and connectionsfor leaks and check torque of carburetor mounting boltslnuts. In the case of major carburetor overhaul, throttle body replacement or high idle CO as indicated by state or local emission inspection, then idle mixture may be adjusted. Adjusting mixture by other than the following method may violate Federal and/or California or other state or Provincial laws. The following procedure MUST be followed. PROCEDURE 1. Set parking brake and block drive wheels. On cars equipped with a vacuum parking brake release, disconnect and plug vacuum hose at brake. 2. Remove air cleaner for access to carburetor, but keep vacuum hoses connected. On cars with automatic level control, disconnect and plug vacuum hose to compressor. ..A 3. Disconnect and plug other hoses as directed on Emission Control lnformation Label under the hood. 4. Engine must be at normal operating temperature, choke open, air conditioning off. 5. Connect an ACCURATE tachometer to engine. 6. Disconnect vacuum advance and plug hose, check ignition timing. I f necessary, adjust to specification shown on Emission Control lnformation Label. Reconnect vacuum advance. NOTE: On cars with electronic spark timing, follow instructions on Emission Control lnformation Label very carefully. 7. Carefully remove caps from idle mixture screws. Be careful not to bend screws. Lightly seat screws, then back out EQUALLY just enough so engine will run. 8. Place transmission in 'Drive (automatics1 or Neutral (manuals). 9. Except certain trucks. See Emission Control lnformation Label. Back each screw out (richen) 118 turn at a time until maximum idle speed is obtained. Then set idle speed screw to value shown in Chart Column A. See specs -page 3 thru 5. Repeat Step 9 to be certain you have maximum idle speed. 10. Turn each screw in (lean) with 118 turn increments until idle speed reaches value shown in Chart Column B. (See specs. -pages 3 ~ 5 ) 11. Reset idle speed to specification shown on Emission Control lnformation Label. (Note: Thls number may be different than the value shown on Chart Column 13). 12. Check and adjust fast idle as described on the Emission Control lnformation Label. 13. Reconnect vacuum hoses, Install air cleaner. 14. Recheck idle speed, If necessary reset to specification. PRINTED U S . A . q 9 7 7 G E N E R A L MOTORS CORP. 1977 ENGINE IDENTIFICATION When performing service on 1977 General Motors passenger cars, it i s often necessary to know the size and the source of the engine. This information is readily available by referring to the vehicle identification number. This number i s in the left corner o f the dash and is visible through the windshield. It also appears on a tag on the rear edge of the left front door. The f i f t h character in the vehicle identification number identifies the engine. VEHICLE IDENTIFICATION NUMBERS Example: 2 Division Code D 7 100000 - Plant 3 A Car Line Series Body Type I Engine Code Letter I Plant Code Following i s a list of engine code letters for 1977. It gives the size of the engine and the division that manufactures the engine. V I N CODE B C D E F H I J - K L P R S T U V X Y Z ENGINE SIZE SOURCE 140 in. 4 cyl. 231 in. V-6 250 in. L-6 98 in. (1.6L) 4 cyl. 260 in. V-8 350 in. (2 bbl.) V-8 85 in. (1.4L) 4 cyl. 350 in. (4 bbl.) V-8 403 in. V-8 350 in. V-8 350 in. V-8 350 in. V-8 425 in. V-8 425 in. V-8 EFI 305 in. V-8 151 in. 4 cyl. 350 in. V-8 301 in. V-8 400 in. V-8 Chevrolet Buick Chevrolet Chevrolet Oldsmobile Buick Chevrolet Buick Oldsmobile Chevrolet Pontiac Oldsmobile Cadillac Cadillac Chevrolet Pontiac Chevrolet Pontiac Pontiac IDLE MIXTURE ADJUSTMENTS ABBREVIATIONS - (Terms): EFI Electronic Fuel Injection MIT Manual Transmission AIT Automatic Transmission AIC Air Conditioning High Altitude - Engines calibrated for elevations over 4000 feet above sea level. Federal - Engines calibrated for all states except California. California - Engines calibrated to meet California emission requirements. When performing idle mixture adjustments 1. Identify engine 2. Follow idle mixture adjustment procedure as outlined on page 1. 3. Set t o specifications that follow.