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3. Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance:
0.060 to 0.104 mm (0.0023 to 0.0041 in.)
Maximum oil clearance: 0.124 mm (0.0049 in.)
If the oil clearance is greater than the maximum, replace all the 8 pistons. If necessary, replace the
c
ylinder block sub-assy.
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Fig. 442: Measuring Piston Diameter At Right Angles Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 3731 of 4500
HINT:
Use a new cylinder block:
Use a piston with the same number mark as the cylinder diameter marked on the cylinder
block.
The shape of the piston varies for the LH and RH banks. The LH piston is marked with "3L"
and the RH piston is marked with "3R".
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Fig. 443: Identifying Cylinder Block Diameter
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Inspect the piston pin fit.
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1. At 60°C (140°F), check that the piston pin can be pushed into the piston pin hole with your
thumb.
Fig. 444: Checking Piston Pin
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Using a micrometer, measure the piston pin diameter.
Piston pin diameter:
21.997 to 22.006 mm (0.8660 to 0.8664 in.)
Page 3734 of 4500
Fig. 445: Measuring Piston Pin Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.INSPECT PISTON RING SET
a. Inspect the piston ring groove clearance.
1. Using a feeler gauge, measure the clearance between a new piston ring and the wall of the
ring groove.
RING GROOVE CLEARANCE:
RING GROOVE CLEARANCE SPECIFICATIONS
If the clearance is not as specified, replace the piston.
No. 10.030 to 0.080 mm (0.0012 to 0.0031 in.)
No. 20.020 to 0.060 mm (0.0008 to 0.0024 in.)
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Fig. 446: Measuring Clearance Between Piston Ring Using Feeler Gauge
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Inspect the piston ring end gap.
1. Insert the piston ring into the cylinder bore.
2. Using a piston, push the piston ring a little beyond the bottom of the ring travel 105 mm (4.13 in.)
from the top of the cylinder block.
Page 3736 of 4500
Fig. 447: Inserting Piston Ring Into Cylinder Bore
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Using a feeler gauge, measure the end gap.
STANDARD END GAP:
END GAP SPECIFICATIONS