Page 228
REPAIR INSTRUCTIONS, PART 1
4. Perform steps 1, 2 and 3 on each piston.
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 (Figure 237).
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.
237
Figure 237 — Side Clearance Measurement
RING INSTALLATION
Identification markings on the rings should face
the piston top. The keystone ring goes in the top
ring groove.
Follow the directions on each piston ring packet.
1. To prevent distortion, use the proper size
piston ring expander, PT6587 (Figure 238),
to place the rings in the piston grooves.
238
Figure 238 — Piston Ring Expander PT6587
2. Stagger the piston rings so that no ring gap
is directly over the wrist pin bore, and no ring
end gaps are aligned over each other
(Figure 239).
1. Ring Groove Side Clearance
5-111.bk Page 228 Monday, July 10, 2006 2:26 PM
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