2. INSPECT PISTON
A. Inspect piston oil clearance
HINT: There are three sizes of the standard diameter, marked
”1”, ”2” and ”3” accordingly. The mark is stamped on the top
of the piston.
(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.)
O/S 0.50
87.410–87.440 mm (3.4413–3.4425 in.)
(b) Measure the cylinder bore diameter in the thrust directions.
(See step 5 on page EG–108)
(c) Subtract the piston diameter measurement from the cylinder
bore diameter measurement.
Standard oil clearance:
0.13–0.15 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.
HINT (Use new cylinder block): Use a piston with the same
number mark as the standard bore diameter marked on the
cylinder block.
–ENGINE TROUBLESHOOTING ENGINE MECHANICAL
EG–111
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