(a) Using a micrometer, measure the piston diameter at
right angles to the piston pin center line, 26 mm (1.02
in.) from the piston head.
Piston diameter:
STD
Mark ”1”
87.360 – 87.370 mm (3.4394 – 3.4398 in.)
Mark ”2’
87.370 – 87.380 mm (3.4398 – 3.4402 in.)
Mark ”3”
87.380 – 87.390 mm (3.4402 – 3.4405 in.)
0/S 0.50
87.860 – 87.890 mm (3.4590 – 3.4602 in.)
(b) Measure the cylinder bore diameter in the thrust di–
rections. (See step 4 on page EG2–107)
(c) Subtract the piston diameter measurement from the
cylinder bore diameter measurement.
Standard oil clearance:
0.130 – 0.150 mm (0.0051 – 0.0059 in.)
Maximum oil clearance:
0.17 mm (0.0067 in.)
If the oil clearance is greater than maximum, replace
all the six pistons. If necessary, rebore all the six
cylinders or replace the cylinder block.
2. INSPECT PISTON
A. Inspect piston oil clearance
HINT: There are three sizes of the standard piston
diameter, marked ”2” and ”3” accordingly. The
mark is stamped on the piston top.
(c) Using solvent and a brush, thoroughly clean the
piston.
NOTICE: Do not use a wire brush.
–ENGINE ENGINE MECHANICAL
EG2–109
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