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Check the crank bearing. Check the crank bearing. The connect-
ing rod shall not have any radial play
(up and down).
It should, however, have axial play, in
order to ensure good lubrication of the
crank bearing among other things.
Inspect the crankshaft bearing and
sealing rings.
Check for wear in the crankshaft
bearing and sealing rings.
Clean the bearings and rotate the outer
ring. If movement is “jerky” the bearing
track is probably damaged. If so,
replace the bearing.
Also check that the gap is not too great.
Inspect the sealing rings. The seal edge
shall be sharp or slightly ground.
Crankshaft and crankcase
Inspect the small end of the connecting
rod.
Inspect the small end of the connecting
rod.
If seizure marks or discolouration are
found in the bearing track the crank-
shaft must be replaced.
Inspecting the
crankshaft
Inspect the large end of the connecting
rod.
Inspecting the
crankshaft
The crankshaft cannot be reconditioned
but must be replaced if it is worn or
damaged.
Inspect the large end of the connecting
rod. If seizure marks, discolouration on
the sides or damaged needle holders
are found the crankshaft must be
replaced.