Jeep J-10 Series 1982 Technical & Service Manual page 160

1B-92 ENGINES
3.629 in.
(92.1766mm)
3.624 in.
(92.0436mm)
3.680 in.
(93.477mm)
3.670 in.
(93.218mm)
OIAMETER
1ST AND ,
2ND
GROOVE
OIAMETER
3RD
GROOVE
MEASURE PISTON
AT THIS AREA
FOR FITTING
0.0805 in.
(2.0447 mm)
,0795 in.
,0193mm)
0.189S In.
(4.8133mm)
0.1880 in.
(4.7752 in
GROOVE
HEIGHT
41909
Fig. IB-138 Piston Measurements
Piston Rings
. The top compression ring is constructed of moly-filled
iron. The second compression ring is constructed of cast-
iron. The oil control ring has a three-piece steel design.
Ring Measurements
CAUTION: Do not remove metal from grooves or
lands. This will change ring groove clearances and will
destroy ring-to-landseating.
(1) Clean carbon deposits from all ring grooves. En
sure oil drain openings in oil ring grooves and pin boss
are open.
(2) Measure ring side clearance with correct size
feeler gauge that fits snugly between ringland and ring.
Slide ring around groove. It must slide freely around
circumference of groove (fig. 1B-139). Refer to Specifica
tions for correct ring side clearance.
(3) Place ring in cylinder bore. Use inverted piston
to push ring down near lower end of ring travel area.
Measure ring gap (clearance) with feeler gauge fitted
snugly in ring opening (fig. 1B-140). Refer to
Specifications.
NOTE: Insert each compression ring (not oil control
rings) in its respective cylinder bore and measure end
gap.
Rg. 1B-139 Ring Side Clearance Measurement
Installation
NOTE: Ensure top and bottom compression rings are
installed properly. Ideally, ring gaps should be spaced
180degreesfrom each other. Correct ringgap spacing is
depicted in figure 1B-U1.
(1) Install oil control rings according to instructions
in package. Roll upper and lower rails into place without
use of tool (fig. 1B-142).
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41947
Rg. 1B-140 Compression Ring Gap Measurement
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