Download Group 14 - Fuel System

A
HOLLEY 4 1 6 0 — F U E L S Y S T E M
14-51
i n s t a l l c l a m p , a f t e r e n g a g i n g stub e n d of s p r i n g i n
c l a m p . I n s t a l l r e t a i n i n g s c r e w a n d tighten s e c u r e l y .
(14) L o o s e n c h o k e v a l v e a t t a c h i n g s c r e w s s l i g h t l y .
(15) T a p lightly o n c h o k e v a l v e to c e n t e r v a l v e i n
a i r h o r n . H o l d i n g c h o k e v a l v e w i t h t h e fingers, tighten
attaching s c r e w s s e c u r e l y . S t a k e b y s q u e e z i n g w i t h
pliers.
(16) E n g a g e f a s t idle c a m w i t h fast idle c a m l e v e r ,
t h e n s l i d e a s s e m b l y onto stub s h a f t positioning fast
idle c a m b e h i n d f a s t idle c a m l e v e r . A t t h e s a m e t i m e
engage fast idle c a m l e v e r w i t h c h o k e rod. I n s t a l l " E "
clip to s e c u r e .
C h o k e Vacuum
VACUUM HOLE
NP767
Fig. 15—Secondary Throttle
Diaphragm
(Exploded View)
Diaphragm
I n s p e c t t h e d i a p h r a g m v a c u u m fitting to b e s u r e
that t h e p a s s a g e i s n o t p l u g g e d w i t h foreign m a t e r i a l .
L e a k c h e c k t h e d i a p h r a g m to d e t e r m i n e i f i t h a s i n t e r n a l l e a k s . T o d o this, first d e p r e s s t h e d i a p h r a g m
s t e m , t h e n p l a c e a finger o v e r t h e fitting to s e a l t h e
opening. R e l e a s e t h e s t e m . I f t h e s t e m m o v e s m o r e
t h a n 1 / 1 6 i n c h i n t e n (10) s e c o n d s , t h e l e a k a g e i s
e x c e s s i v e a n d the a s s e m b l y m u s t b e r e p l a c e d .
Install the diaphragm assembly on the carburetor
as follows:
(1) E n g a g e c h o k e l i n k i n slot i n c h o k e l e v e r .
(2) P l a c e t h e d i a p h r a g m o n t h e m o u n t i n g s u r f a c e .
I n s t a l l a n d t i g h t e n the attaching s c r e w s s e c u r e l y .
(3) I n s p e c t t h e r u b b e r hose f o r c r a c k s b e f o r e p l a c i n g it on the c o r r e c t c a r b u r e t o r fitting. D o not c o n n e c t
then carefully lower cover. Install attaching screws
a n d tighten s e c u r e l y .
(6) C h e c k d i a p h r a g m b y p r e s s i n g in o n s t e m a n d
p l a c i n g finger o v e r port. D i a p h r a g m s h o u l d s t a y i n
r e t r a c t e d position.
(7) I n s t a l l a n e w g a s k e t i n v a c u u m p a s s a g e r e c e s s
i n d i a p h r a g m h o u s i n g , t h e n i n s t a l l s e c o n d a r y diap h r a g m on m a i n body of c a r b u r e t o r a n d at t h e s a m e
t i m e engage s t e m w i t h s e c o n d a r y stop l e v e r . I n s t a l l
s c r e w s a n d tighten s e c u r e l y .
(8) I n s t a l l p u m p l e v e r o n s t u b s h a f t a n d s e c u r e
w i t h " E " clip. S l i d e s p r i n g a n d l o c k n u t b e t w e e n f u e l
p u m p l e v e r a n d p u m p o p e r a t i n g l e v e r . O p e n throttle
valve a n d install adjusting screw. Tighten 2 or 3
t h r e a d s to hold. T h e c o r r e c t s e t t i n g of t h e a d j u s t i n g
s c r e w w i l l be c o v e r e d u n d e r a d j u s t m e n t s .
the v a c u u m h o s e to t h e d i a p h r a g m fitting u n t i l a f t e r
the v a c u u m k i c k a d j u s t m e n t h a s b e e n made.
(4) I n s t a l l h o t idle
c o m p e n s a t o r valve g a s k e t i n
position i n r e c e s s i n m a i n body, followed b y v a l v e . ( B e
s u r e v a l v e i s positioned w i t h l e g s toward outside of
m a i n body.) ( F i g . 5). P l a c e c o v e r over opening a n d
install
attaching
screws.
Tighten
securely.
(If so
equipped.)
(5) S l i d e a n e w distributor g r o u n d s w i t c h i n s u l a t e d
b u s h i n g into stop o n m a i n body, w i t h the n o t c h a l i g n e d
w i t h r a i s e d portion of boss. F o r c e into position against
stop.
(6) P l a c e i n s u l a t i n g w a s h e r o v e r tangs o n l e a d w i r e
t e r m i n a l , t h e n i n s t a l l c u r b i d l e speed s c r e w w i t h
spring through terminal and washer.
(7) T u r n s c r e w into boss, at t h e s a m e time, k e e p
i n s u l a t i n g w a s h e r aligned.
Assembling
Secondary
Diaphragm
(1) S l i d e d i a p h r a g m into h o u s i n g ( F i g . 15).
(2) P o s i t i o n d i a p h r a g m so that t h e v a c u u m hole i n
h o u s i n g i s a l i g n e d w i t h v a c u u m hole i n d i a p h r a g m .
(3) I n s t a l l d i a p h r a g m r e t u r n s p r i n g w i t h c o i l e d e n d
snapped over button i n cover.
(4) S u p p o r t d i a p h r a g m s t e m i n o r d e r to k e e p diap h r a g m flat as s p r i n g a n d c o v e r a r e i n s t a l l e d .
(5) A l i g n v a c u u m port i n c o v e r w i t h port i n h o u s i n g
CARBURETOR
ADJUSTMENTS
It i s v e r y i m p o r t a n t that t h e f o l l o w i n g a d j u s t m e n t s
be m a d e on a r e c o n d i t i o n e d c a r b u r e t o r :
Q u a l i f y i n g the C h o k e C o n t r o l L e v e r
C h o k e U n l o a d e r A d j u s t m e n t (wide open k i c k )
F a s t Idle C a m Position A d j u s t m e n t
V a c u u m K i c k A d j u s t m e n t (On o r off v e h i c l e )
F a s t I d l e S p e e d A d j u s t m e n t (On t h e v e h i c l e )
C h e c k i n g the B o w l V e n t V a l v e C l e a r a n c e .
C h e c k i n g the P u m p L e v e r C l e a r a n c e
I d l e S p e e d A d j u s t m e n t ( C u r b idle)
Adjusting the Float
Secondary Throttle Adjustment
Idle Mixture Adjustment
Checking Wet Fuel Level
Checking
(C.A.S.)
Bowl
Vent
Valve
Clearance
T o c h e c k t h e b o w l vent v a l v e c l e a r a n c e ( F i g . 16),
p r o c e e d as follows:
(1) W i t h throttle v a l v e s a t c u r b i d l e , i t s h o u l d b e
possible to i n s e r t a 1 / 1 6 i n c h d r i l l s h a n k b e t w e e n
b o w l vent v a l v e a n d top of p r i m a r y f u e l b o w l , w i t h
the i d l e s p e e d p r o p e r l y set.
(2) I f a n a d j u s t m e n t
i s necessary,
bend
r o d to