TM 10-4610-310-14
0121 00
PISTON RINGS - continued
6. Measure the piston ring end gap as follows:
a. Measure at the lower part of the cylinder. This is the area with the least wear.
b. Push the piston ring into the cylinder block using the head of the piston. See Figure 5 (a).
c.
Remove the piston and leave the piston ring inside. See Figure 5 (b).
d. Measure the gap of the piston ring.
(a)
(b)
Figure 5. Ring End Gap Measurement.
e. Measure the piston ring end gap. Replace if the gap is wider than the service limit. See Table 3.
Table 3. Piston Ring End Gap
SERVICE LIMIT
st
1.0 mm (0.039 inch)
1 Ring
2nd Ring
1.0 mm (0.039 inch)
1.0 mm (0.039 inch)
Oil Ring
ASSEMBLY
Use the following precautions when replacing piston rings:
a. Never stretch the piston ring.
b. Carefully clean the ring groove. The end gap of the top ring should face the intake side.
c.
When inserting the piston ring, the manufacturer marker should face up. See Figure 6.
Figure 6. Piston Ring Marker.
