APRILIA M191M, Workshop Manual

Page: 98 / 177

ENGINE
3 - 74
Engines M192M / M191M / M245M / M234M / M282M / M281M
Checking crankshaft alignment
• Measure crankshaft misalignment in the four points in-
dicated.
Max. misalignment allowed:
A = 0.15 mm
B = 0.01 mm
C = 0.01 mm
D = 0.10 mm
•
Check that crankshaft cone, keyway, oil seal thrust sur-
face, ribbed end and threaded dowels are in good con-
dition.
• If necessary change the crankshaft.
NOTE Main bearings cannot be ground. Con-rod big-end
bearings cannot be changed.
Con-rods cannot be changed for the same reason when
cleaning the crankshaft, take special care to prevent dirt from
entering the crankshaft lubrication hole.
To avoid damage to con-rod bearings, do not clean lubrica-
tion duct with compressed air.
• Make sure that the two buffers are correctly installed
on crankpin.
• Lubrication pressure to con-rod bearings can be im-
paired if one buffer is not correctly installed.