Jeep 1996 Grand Cherokee Service Manual - page 994
(9) Lift sprockets and chain (keep sprockets tight
against the chain in position as described).
(10) Slide both sprockets evenly over their respec-
tive shafts and use a straightedge to check alignment
of timing marks (Fig. 7).
(11) Install the camshaft bolt. Tighten the bolt to
47 N·m (35 ft. lbs.) torque.
(12) Check camshaft end play. The end play should
be 0.051-0.152 mm (0.002-0.006 inch) with a new
thrust plate and up to 0.254 mm (0.010 inch) with a
used thrust plate. If not within these limits install a
new thrust plate.
FITTING PISTONS
Piston and cylinder wall must be clean and dry.
Specified clearance between the piston and the cylin-
der wall is 0.013-0.038 mm (0.0005-0.0015 inch) at
21°C (70°F).
Piston diameter should be measured at the top of
skirt, 90° to piston pin axis location A in (Fig. 8). Cyl-
inder bores should be measured halfway down the
cylinder bore and transverse to the engine crankshaft
center line.
Pistons and cylinder bores should be measured at
normal room temperature, 21°C (70°F).
FITTING PISTON RINGS
(1) Measurement of end gaps:
(a) Measure piston ring gap 2 inches from bottom
of cylinder bore. An inverted piston can be used to
push the rings down to ensure positioning rings
squarely in the cylinder bore before measuring.
(b) Insert feeler gauge in the gap. The top com-
pression ring gap should be between 0.254-0.508
mm (0.010-0.020 inch). The second compression
ring gap should be between 0.508-0.762 mm (0.020-
0.030 inch). The oil ring gap should be 0.254-1.270
mm (0.010-0.050 inch).
(c) Rings with insufficient end gap may be prop-
erly filed to the correct dimension. Rings with
excess gaps should not be used.
(2) Install rings and confirm ring side clearance:
(a) Install oil rings being careful not to nick or
scratch the piston. Install the oil control rings accord-
ing to instructions in the package. It is not necessary
to use a tool to install the upper and lower rails.
Insert oil rail spacer first, then side rails.
(b) Install the second compression rings using
Installation Tool C-4184. The compression rings
must be installed with the identification mark face
up (toward top of piston) and chamfer facing down.
An identification mark on the ring is a drill point,
a stamped letter “O”, an oval depression or the
word TOP (Fig. 9) (Fig. 11).
(c) Using a ring installer, install the top com-
pression ring with the chamfer facing up (Fig. 10)
(Fig. 11). An identification mark on the ring is a
drill point, a stamped letter “O”, an oval depression
or the word TOP facing up.
(d) Measure side clearance between piston ring
and ring land. Clearance should be 0.074-0.097 mm
(0.0029-0.0038 inch) for the compression rings. The
steel rail oil ring should be free in groove, but
should not exceed 0.246 mm (0.0097 inch) side
clearance.
(e) Pistons with insufficient or excessive side
clearance should be replaced.
FITTING CONNECTING ROD BEARINGS
Fit all rods on a bank until completed. DO NOT
alternate from one bank to another, because connect-
Fig. 7 Alignment of Timing Marks
Fig. 8 Piston Measurements
ZJ
5.2L ENGINE
9 - 57
SERVICE PROCEDURES (Continued)