Valve Timing - Jeep KJ 2005 Service Manual

KJ
MANIFOLD - EXHAUST (Continued)
Fig. 109 Exhaust Manifold Right
1 - HEAT SHIELD
2 - NUTS
3 - MANIFOLD FLANGE
Fig. 110 Exhaust Manifold left
1 - HEAT SHIELD
2 - NUTS
3 - MANIFOLD FLANGE
(1) Position the engine exhaust manifold and gas-
ket on the two studs located on the cylinder head.
Install conical washers and nuts on these studs .
(2) Install remaining conical washers. Starting at
the center arm and working outward, tighten the
bolts and nuts to 25 N·m (18 ft. lbs.) torque.
(3) Install the exhaust heat shields.
(4) Raise and support the vehicle.
CAUTION: Over tightening heat shield fasteners,
may cause shield to distort and/or crack.
(5) Assemble exhaust pipe to manifold and secure
with bolts, nuts and retainers. Tighten the bolts and
nuts to 34 N·m (25 ft. lbs.) torque.
LEFT EXHAUST MANIFOLD
CAUTION: If the studs came out with the nuts when
removing the engine exhaust manifold, install new
studs. Apply sealer on the coarse thread ends.
Water leaks may develop at the studs if this precau-
tion is not taken.
(1) Position the engine exhaust manifold and gas-
ket on the two studs located on the cylinder head.
Install conical washers and nuts on these studs .
(2) Install remaining conical washers. Starting at
the center arm and working outward, tighten the
bolts and nuts to 25 N·m (18 ft. lbs.) torque.
(3) Install the exhaust heat shields.
(4) Raise and support the vehicle.
CAUTION: Over tightening heat shield fasteners,
may cause shield to distort and/or crack.
(5) Assemble exhaust pipe to manifold and secure
with bolts, nuts and retainers. Tighten the bolts and
nuts to 34 N·m (25 ft. lbs.) torque.

VALVE TIMING

DESCRIPTION
The timing drive system (Fig. 111)has been
designed to provide quiet performance and reliability
to support a non-free wheeling engine. Specifically
the intake valves are non-free wheeling and can be
easily damaged with forceful engine rotation if cam-
shaft-to-crankshaft timing is incorrect. The timing
drive system consists of a primary chain (6), two sec-
ondary timing chain drives (1,4) and a counterbal-
ance shaft drive.
OPERATION
The primary timing chain is a single inverted tooth
chain type. The primary chain drives the large 50
tooth idler sprocket directly from a 25 tooth crank-
shaft sprocket. Primary chain motion is controlled by
a pivoting leaf spring tensioner arm and a fixed
ENGINE - 3.7L 9 - 149