6A – 88 ENGINE MECHANICAL
4. Visually inspect the piston rings.
If a piston ring groove is damaged or distorted, the piston
must be replaced.
Piston Pin Diameter
Use a micrometer to measure the piston pin diameter at
several points.
If the measured value is less than the specified limit, the piston
pin must be replaced.
Piston Pin Diameter
mm (in)
Standard Limit
30.995-31.000
(1.2202-1.2204)
30.97
(1.2193)
Piston Pin and Piston Clearance
Use and inside dial indicator to measure the piston pin hole (in
the piston).
Piston Pin Hole
mm (in)
4JA1T (L) 31.002-31.010 (1.2206-1.2208)
4JA1TC, 4JH1TC 31.005-31.013 (1.2207-1.2210)
iston Pin and Piston Pin Hole Clearance mm (in)
4JA1T (L) 0.002-0.015 (0.00008-0.0006)
4JA1TC, 4JH1TC 0.005-0.018 (0.0002-0.0007)
CYLINDER HEAD GASKET SELECTION
Cylinder head gasket is determined by the piston head
projection from the cylinder body upper surface, in order to
improve engine performance.
Three types of gasket are provided by the difference of
thickness. Select the adequet one out of three grades of
gasket, according to the following procedure.
Before measurement, clear off carbon from the piston head
and cylinder body surface and also clean the place where a
gasket was installed.
015LX026
015RW048
011LX011
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