Piston Pin - Removal; Piston Ring - Removal; Piston Ring Fitting; Piston Rings - Installation - Jeep 200 Cherokee Service Manual

9 - 36 ENGINE
REMOVAL AND INSTALLATION (Continued)
(2) Remove cylinder heads, refer to cylinder head
removal in this section.
(3) Raise vehicle on host.
(4) Remove oil pan, refer to oil pan removal in this
section.
(5) Remove top ridge of cylinder bores with a reli-
able ridge reamer before removing pistons from cyl-
inder block. Be sure to keep tops of pistons
covered during this operation. Mark piston with
matching cylinder number.
(6) Pistons and connecting rods must be removed
from top of cylinder block. Rotate crankshaft so that
each connecting rod is centered in cylinder bore.
(7) Remove connecting rod cap. Install connecting
rod bolt protectors on connecting rod bolts. Push each
piston and rod assembly out of cylinder bore.
NOTE: Be careful not to nick crankshaft journals.
(8) After removal, install bearing cap on the mat-
ing rod.
Fig. 53 Piston Assembly
PISTON PIN—REMOVAL
(1) Secure connecting rod in a soft jawed vice.
(2) Remove 2 clips securing piston pin.
(3) Push piston pin out of piston and connecting
rod.
2000 JEEP CHEROKEE
PISTON RING—REMOVAL
Fig. 54 Piston Rings—Removing and Installing
(1) ID mark on face of upper and intermediate pis-
ton rings must point toward piston crown.
(2) Using a suitable ring expander, remove upper
and intermediate piston rings (Fig. 54).
(3) Remove the upper oil ring side rail, lower oil
ring side rail and then oil ring expander from piston.
(4) Carefully clean carbon from piston crowns,
skirts and ring grooves ensuring the 4 oil holes in
the oil control ring groove are clear.

PISTON RING FITTING

(1) Wipe cylinder bore clean. Insert ring and push
down with piston to ensure it is square in bore. The
ring gap measurement must be made with the ring
positioning at least 12 mm (0.50 in.) from bottom of
cylinder bore. Check gap with feeler gauge. Top com-
pression ring gap.25 to.50mm (.0098 to.0196 in.). Sec-
ond compression ring gap.25 to.35mm (.0098 to.0137
in.). Oil control ring gap.25 to.58mm (.0098 to.0228
in.).
(2) If ring gaps exceed dimension given, new rings
or cylinder liners must be fitted. Keep piston rings in
piston sets.
(3) Check piston ring to groove clearance (Fig. 56).
Top compression ring gap.08 to.130mm (.0031 to.0051
in.). Second compression ring gap.070 to.102mm
(.0027 to.0040 in.). Oil control ring gap.040 to.072mm
(.0015 to.0028 in.).
PISTON RINGS—INSTALLATION
(1) Install rings on the pistons using a suitable
ring expander (Fig. 57).
(2) Top compression ring is tapered and chromium
plated. The second ring is of the scraper type and
must be installed with scraping edge facing bottom of
the piston. The third is an oil control ring. Ring gaps
must be positioned, before inserting piston into the
liners, as follows (Fig. 59).
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