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PISTON AND CONNECTING ROD, CYLINDER LINER
Inspection procedure
11-42
Inspection: Piston projection from crankcase top surface
CAUTION
• The amount of piston projection affects engine perfor-
mance and must therefore be inspected without fail.
• Set the piston at the top dead center.
• Mark reference points A (seven points in total) on the top surface
of the crankcase as shown in the illustration. Using each of the
marks as a zero point, measure the amount of piston projection
relative to the zero point (height of measurement point B –
height of reference point A).
• Make the measurements at the two measurement points B for
each cylinder (twelve points in total) using the reference point A
nearest to each measurement point, and calculate the average
value of all the measurements.
• If the average value is out of the standard value range, check the
clearances between all relevant parts.
Inspection: Connecting rod end play
• Measure the end play for every connecting rod.
• If any measurement exceeds the specified limit, replace the de-
fective part(s).
Inspection: Cylinder liner flange projection
• If the measurement deviates from the standard value, inspect
the installation and replace the defective part(s).
CAUTION
• If the cylinder liner flange protrusion is less than the speci-
fied value, the contact pressure of the cylinder head gasket
against the bore of the cylinder will not be high enough to
prevent gas leakage.
Inspection: Connecting rod bearing span when free
CAUTION
• Do not attempt to manually expand the bearings.
• If the span is less than the specified limit, replace both the upper
and lower bearings.
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