11-52
Inspection: Piston projection from upper crankcase top sur-
face
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 (five points in total) on the top surface of
the upper crankcase as shown in the illustration. Using each of
the marks as a zero point, measure the amount of piston projec
-
tion 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 (eight 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.
• Select and use a cylinder head gasket that can accommodate
the average piston projection (average value of the eight mea
-
surements). (See the CYLINDER HEAD section.)
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: Difference in flange projection between neigh-
boring cylinder liners
• Install on the upper crankcase so that it is not lying on top
of any part of the flanges. Tighten to a torque of 49 N·m {5
kgf·m}.
• Measure the amount of projection of the cylinder liner flange
above the upper crankcase top surface.
• If the measurement is not within the standard value range, in-
spect the state of installation of the cylinder liner and then re-
place the defective part(s).
CAUTION
• Insufficient projection of the flange can lead to a reduced
pressure around the bore of the cylinder head gasket, caus-
ing gas leakage.
PISTONS, CONNECTING ROD AND CYLINDER LINERS
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