Page 178
REPAIR INSTRUCTIONS
2. Using a four- to five-inch micrometer,
measure the distance between the outer
edges of the two parallel pins. Check each
compression ring groove in two locations:
parallel and perpendicular to the wrist pin
bore. Record both measurements.
3. Compare readings with the tolerances listed
under Fits and Limits in the
SPECIFICATIONS section.
171
Figure 171 — Ring Groove Wear Measurement
4. Perform steps 1, 2 and 3 on each piston.
Refer to Figure 172.
5. Check the oil control ring as follows:
a.
Using a thickness gauge, check for
excessive wear of the oil control ring
groove side clearance (1). Position a
new oil control ring in the groove and
insert a thickness gauge between the
ring and upper land of the groove.
b.
Record the measurement and compare
the reading with the tolerance listed
under Fits and Limits in the
SPECIFICATIONS section.
For a new ring and piston, the oil ring side
clearance is 0.0016–0.0030 inch
(0.0406–0.0762 mm). For an old ring and piston,
the clearance should NOT exceed 0.0045 inch
(0.1143 mm).
6. Perform step 5 on each piston.
172
Figure 172 — Side Clearance Measurement
1. Ring Groove Side Clearance
5_106_00.bk Page 178 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs
