INSPECTION AND REPAIR OF BASIC ENGINE
6-6
1.8 Measuring distortion of the bottom surface
of the cylinder head
&$87,21
Refacing of cylinder head should be kept to an abso-
lute minimum.
Excessive grinding of the cylinder head may result in
defects such as defective combustion and stamping
(contact between piston and valve).
With a straight edge placed on the bottom face of the
cylinder head, measure the bottom face distortion using a
feeler gauge. If the measurement exceeds the limit, grind the
bottom face using a surface grinder.
Measuring distortion of the bottom surface of the
cylinder head
1.9 Measuring push rod runout
Measure the runout of push rod. If the standard value is
exceeded, replace the push rod.
Measuring runout of push rod
Item Standard Limit
Bottom surface distortion
0.05 mm
[0.0020 in.]
0.10 mm
[0.0039 in.]
Measuring points
Item Standard Limit Remark
Push
rod
runout
Less than 0.3 mm
[0.012 in.]
0.3 mm
[0.012 in.]
Total indicated
reading
(TIR)
1/2L1/2L
L
Pushrod
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