Download ENGINE MECHANICAL Supplement 3 (Diesel)

YD25DDTi
CYLINDER HEAD
Installation (Cont’d)
Gasket thickness*
mm (in)
Number of grade
Number of cut-outs
0.900 (0.0354)
1
0
0.925 (0.0364)
2
1
0.950 (0.0374)
3
2
0.975 (0.0384)
4
3
1.000 (0.0394)
5
4
1.025 (0.0404)
6
5
*: Measured with head bolts tightened
SEM891G
+ Gasket thickness can be identified at the location shown in
the figure by the numbers of cut-outs before removal.
When the following parts have been repaired/replaced:
+ With cylinder block upper surface and/or crankshaft pin journal ground
+ With cylinder block, pistons, connecting rods, and/or crankshaft replaced
1. Set piston at a point close to TDC.
2. Set a dial gauge at the location as shown in the figure. Turning crankshaft gradually, set the gauge scale to “0” where the
piston protrusion is maximized.
3. Move the dial gauge stand so that the tip of dial gauge can
contact the cylinder block. Read the difference.
4. Measure at two locations per cylinder, that is eight locations
for four cylinders. Select gasket based on the maximum protrusion of eight measurements.
JEM170G
Identification
Gasket thickness*
mm (in)
Number of cut-outs
Less than 0.255 (0.0100)
0.900 (0.0354)
0
Less than 0.255 - 0.280
(0.0100 - 0.0110)
0.925 (0.0364)
1
Less than 0.280 - 0.305
(0.0110 - 0.0120)
0.950 (0.0374)
2
Less than 0.305 - 0.330
(0.0120 - 0.0130)
0.975 (0.0384)
3
Less than 0.330 - 0.355
(0.0130 - 0.0140)
1.000 (0.0394)
4
More than 0.355 (0.0140)
1.025 (0.0404)
5
Piston protrusion
mm (in)
*: Measured with head bolts tightened
CYLINDER HEAD BOLT DEFORMATION CHECK
+ Measure the outer diameter of threaded area, d1 and d2, at
the points specified in the figure.
+ When the necked point is identified at a point other than
specified points, measure at the point as d1.
+ Calculate the difference between d1 and d2. If the value
exceeds the limit, replace with new ones.
Limit: 0.15 mm (0.0059 in)
JEM171G
EM-3057