DISASSEMBLY OF BASIC ENGINE
5-5
1.7 Measuring piston protrusion
&$87,21
Piston protrusion must always meet the standard, as
the amount of protrusion not only influences on the
engine performance, but also it is important to prevent
valve interference.
Measure the protrusion of each piston following the
instructions below. If the measured value exceeds the limit,
inspect and repair each bearings.
(1) Search the top dead center of the piston by using dial
guage.
(2) Apply the dial gauge plunger to the top surface of the
crankcase, and zero the dial gauge.
(3) Measure the protrusion at three points on the piston
head, and calculate the mean value. Subtract the mean
value from the thickness of the gasket compressed by
tightening the cylinder head, and the clearance between
the piston top and cylinder head will be determined.
Measuring piston protrusion
Item Standard
Piston protrusion
0.13 to 0.60 mm
[0.0051 to 0.0236 in.]
Compressed thickness of
cylinder head gasket
1.27 to 1.37 mm
[0.0500 to 0.0539 in.]
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