7. CYLINDER/PISTON DOWNTOWN 125i
Cylinder
Check the cylinder for warpage with a
straight edge and feeler gauge in the
directions shown.
Se
Check the cylinder wall for wear or damage.
Measure and record the cylinder I.D. at three
levels in an X and Y axis. Take the maximum
reading to determine the cylinder wear. TOP
MIDDLE
BOTTOM
Measure the piston-to-cylinder clearance.
Take a maximum reading to determine the
clearance.
Measure the taper and out-of-round at three
levels in an X and Y axis. Take the maximum
reading to determine them.
Measure the connecting rod small end I.D.
vi
Measure the connecting rod-to-piston pin
clearance.
7-7
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