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: Typically there is a top and bottom profile
to compression rings, But the compression rings
on the MTD are symmetrical.
See Figure 10.10.
7. Measure the distance between the ring and the
ring land using a feeler gauge and compare the
measurement to the chart at the end of this
chapter.
See Figure 10.11.
Figure 10.9
Feeler gauge
Piston ring
Figure 10.10
Top piston ring
Middle piston ring
3-piece oil ring
Figure 10.11
Feeler gauge
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