Timing Chain And Sprockets-Inspection, Removal And Installation - Jeep cherokee 1989 Owner's Manual

28-8
I 2
anaerobic sealant
the mating surface where the cover engages the oil pan lip). Apply RTV-
type sealant to the cover-to-oil pan area. Also apply anaerobic sealant
to the areas surrounding the coolant passages (see illustration).
9 Place the timing chain cover in position on the engine block and
install the mounting bolts. Tighten the bolts to the specified torque.
10 The remaining installation procedures are the reverse of removal.
1 4 Timing chain and sprockets
and installation
Refer to illustrations 14.8, 14.9, 14.10 and 14.12
1
Disconnect the cable from the negative battery terminal.
2 Remove the vibration damper (refer to Section 11).
3 Remove the timing chain cover (refer to Section 13).
4 Before removing the chain and sprockets, visually inspect the teeth
on the sprockets for signs of wear and check the chain for looseness.
5 If either or both sprockets show any signs of wear (edges on the
teeth of the camshaft sprocket rounded, bright or blue areas on the
teeth of either sprocket, chipping, pitting, etc.), they should be replaced
with new ones. Wear in these areas is very common. Failure t o replace
A screwdriver will hold the camshaft sprocket i n
14.9
place while loosening the mounting bolts
The Motor Manual Guy
Chapter 2 Part B
-
inspection, removal
V 6 engine
14.8 The camshaft and crankshaft timing marks (arrows)
should be in exact alignment before removing the timing
sprockets and chain
a worn timing chain and sprockets may result in erratic engine perform-
ance, loss of power and lowered gas mileage.
6 If any one component (timing chain or either sprocket) requires
replacement, the other t w o components should be replaced as well.
7
If it is determined that the timing components require replacement,
proceed as follows.
8 Reinstall the vibration damper center bolt and use it to turn the
crankshaft clockwise until the marks on the camshaft and crankshaft
are in exact alignment (see illustration). At this point the number one
and four pistons will be at top dead center with the number four piston
in the firing position (verify by checking the position of the rotor in
the distributor, which should point t o the number four spark plug wire
terminal). Note: Do not attempt to remove either sprocket or the timing
chain until this is done and do not turn the crankshaft or camshaft after
the sprockets/chain are removed.
9 Remove the three camshaft sprocket retaining bolts (see illustra-
tion) and lift the camshaft sprocket and timing chain off the front of
the engine. It may be necessary to tap the sprocket with a soft-faced
hammer t o dislodge it.
10 If it is necessary to remove the crankshaft sprocket, it can be
withdrawn from the crankshaft with a special puller (see illustration).
1 1 Push the crankshaft sprocket onto the crankshaft using a bolt and
washer from the puller set.
14.10 A special puller will be needed t o remove the
crankshaft sprocket