Engine Cylinder Head Assembly; Fabricate Alignment Dowels; Alignment Dowel Locations - Jeep 200 Cherokee Service Manual

XJ
REMOVAL AND INSTALLATION (Continued)
Fig. 56 Engine Cylinder Head Assembly
1 – BRIDGE
2 – PIVOT ASM.
3 – ROCKER ARM
4 – CYLINDER HEAD
5 – HEAD GASKET
6 – PUSH ROD
(1) Fabricate two engine cylinder head alignment
dowels from used head bolts (Fig. 57). Use the long-
est head bolt. Cut the head of the bolt off below the
hex head. Then cut a slot in the top of the dowel to
allow easier removal with a screwdriver.
Fig. 57 Fabricate Alignment Dowels
1 – USED CYLINDER HEAD BOLT
2 – SLOT
(2) Install one dowel in bolt hole No.10 and the
other dowel in bolt hole No.8 (Fig. 58).
(3) Remove the shop towels from the cylinder
bores. Coat the bores with clean engine oil.
(4) Place the engine cylinder head gasket (with the
numbers facing up) over the dowels.
(5) Place the engine cylinder head over the dowels.
Fig. 58 Alignment Dowel Locations
1 – ALIGNMENT DOWEL
2 – ALIGNMENT DOWEL
CAUTION: Engine cylinder head bolts should be
reused only once. Replace the head bolts if they
were used before or if they have a paint dab on the
top of the bolt.
(6) Coat the threads of bolt No.7, only, with Loctite
PST sealant or equivalent.
(7) Install all head bolts, except No.8 and No.10.
(8) Remove the dowels.
(9) Install No.8 and No.10 head bolts.
CAUTION: During the final tightening sequence,
bolt No.7 will be tightened to a lower torque than
the rest of the bolts. DO NOT overtighten bolt No.7.
(10) Tighten the engine cylinder head bolts in
sequence according to the following procedure (Fig.
59) :
(a) Tighten all bolts in sequence (1 through 10)
to 30 N·m (22 ft. lbs.) torque.
(b) Tighten all bolts in sequence (1 through 10)
to 61 N·m (45 ft. lbs.) torque.
(c) Check all bolts to verify they are set to 61
N·m (45 ft. lbs.) torque.
(d) Tighten bolts (in sequence):
• Bolts 1 through 6 to 149 N·m (110 ft. lbs.)
torque.
• Bolt 7 to 136 N·m (100 ft. lbs.) torque.
• Bolts 8 through 10 to 149 N·m (110 ft. lbs.)
torque.
(e) Check all bolts in sequence to verify the cor-
rect torque.
(f) If not already done, clean and mark each bolt
with a dab of paint after tightening. Should you
encounter bolts which were painted in an earlier
service operation, replace them.
(11) Connect the coolant temperature sending unit
connector.
(12) Install the spark plugs and tighten to 37 N·m
(27 ft. lbs.) torque. Connect the ignition wires.
2.5L ENGINE 9 - 39