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Group 21 Engine Body
136
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Crankcase
Flatness of gasket surface
Measure flatness with a straight edge and feeler
gauges. If the warpage exceeds the assembly stan-
dard, reface the gasketed surfaces with a surface
grinder.
Crankcase gasket surface flatness, mm [in]
Assembly standard ... 0.1 [0.004] max
Repair limit ................ 0.2 [0.008]
NOTE! Do not grind the crankcase more than neces-
sary to remove warpage. Excessive grinding can
cause the piston protrusion to exceed assembly stan-
dard.
Main bearing bore diameter
Secure the end bearing cap to the specified torque,
and measure the bore diameter in the three direc-
tions.
Main bearing bore diameter, mm [in]
Nominal value ........... Ø179 [7.05]
Assembly standard ... 179.000–179.025 [7.04723–7.04821]
Service Limit ............. 179.045 [7.04900]
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