CRANKSHAFT, PISTON AND CONNECTING ROD
70
Piston Inspection
1. Clean the piston and remove all carbon from the
rings and ring groves.
2. Clean the cylinder bore and remove all carbon.
3. Insert one ring into the cylinder. Push it down
about one inch from the top.
See Figure 10.9.
4. Measure the end gap with a feeler gauge and
compare to the chart at the end of this chapter.
See Figure 10.9.
5. Repeat steps 3 and 4 on the other rings.
NOTE: Piston rings are not available as service
parts. If any of the end gaps are out of spec, the
engine must be short blocked.
6. Install rings back onto the piston.
NOTE: The compression rings on the MTD
engine have different profiles. It is important that
the proper profiled ring is on the right grove.
See Figure 10.10.
NOTE: To help identify the top surface of the
middle piston ring, it has an “H” etched on it.
See Figure 10.11.
Figure 10.9
Feeler gauge
Piston ring
Figure 10.10
Top piston ring
Middle piston
3-piece oil ring
ring
Figure 10.11
“H” etched on the top surface
of the middle piston ring
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