Chapter 10: Crankshaft, piston and Connecting Rod
92
Cylinder inspection
1. Clean and inspect the cylinder, inside and out.
NOTE: If there is any sign of damage, especially
cracked cooling fins, short block the engine.
NOTE: Take two measurements of the cylinder
bore 90 degrees apart at the top, bottom and
middle of the cylinder. See Figure 10.16.
NOTE: The measurements can be made using
telescoping gauges, inside micrometers or a cyl-
inder bore dial indicator. See Figure 10.17.
2. Compare the measurements to those that are
listed in the chart at the end of the chapter.
3. Inspect the cylinder cross hatch.
See Figure 10.18.
NOTE: The cross hatch is important because it
helps hold oil on the cylinder walls.
NOTE: If the cross hatch is polished off, that is a
sign of dirt ingestion. The cylinder can not be re-
honed because replacement piston rings are not
available. The engine must be short blocked.
Figure 10.16
Measure the cylinder bore
Figure 10.17
Measuring the cylinder bore using
a cylinder bore dial indicator
Figure 10.18
Cross hatch
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