Dodge Dakota (R1). Manual — part 502
(5) Remove the front two exhaust heat shield
retaining fasteners. Raise vehicle and remove the
fasteners at rear of heat shield.
(6) Remove heat shield (Fig. 119).
(7) Lower vehicle and remove the upper exhaust
manifold retaining bolts (Fig. 119).
(8) Raise vehicle and remove the lower exhaust
manifold retaining bolts (Fig. 119).
(9) Remove exhaust manifold and gasket (Fig.
119). Manifold is removed from below the engine
compartment.
CLEANING
(1) Clean the exhaust manifold using a suitable
cleaning solvent, then allow to air dry.
(2) Clean all gasket residue from the manifold
mating surface.
INSPECTION
(1) Inspect the exhaust manifold for cracks in the
mating surface and at every mounting bolt hole.
(2) Using a straight edge and a feeler gauge, check
the mating surface for warp and twist.
Fig. 119 Exhaust Manifold—Left
ITEM
DESCRIPTION
TORQUE
ITEM
DESCRIPTION
TORQUE
1
Stud (Qty 2)
25 N·m (18 ft. lbs.)
4
Nut (Qty 2)
8 N·m (72 in. lbs.),
then loosen 45
degrees
2
Bolt (Qty 4)
5
Nut (Qty 2)
3
Stud (Qty 2)
9 - 196
ENGINE 4.7L
AN
EXHAUST MANIFOLD (Continued)
(3) Inspect the manifold to exhaust pipe mating
surface for cracks, gouges, or other damage that
would prevent sealing.
INSTALLATION
RIGHT EXHAUST MANIFOLD
(1) Install exhaust manifold and gasket (Fig. 120)
from below engine compartment.
(2) Install lower exhaust manifold fasteners. DO
NOT tighten until all fasteners are in place.
(3) Lower vehicle and install upper exhaust mani-
fold fasteners. Tighten all manifold bolts starting at
center and working outward to 25 N·m (18 ft. lbs.).
CAUTION: Over tightening heat shield fasteners,
may cause shield to distort and/or crack.
(4) Install exhaust manifold heat shield. Tighten
fasteners to 8 N·m (72 in. lbs.), then loosen 45
degrees.
(5) Install starter and fasteners.
(6) Connect exhaust pipe to manifold.
(7) Connect heater hoses at engine.
(8) Install fastener attaching A/C accumulator.
(9) Install A/C compressor and fasteners.
(10) Install accessory drive belt (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
INSTALLATION).
(11) Install air cleaner assembly, resonator assem-
bly and air inlet hose.
Fig. 120 Exhaust Manifold—Right
ITEM
DESCRIPTION
TORQUE
ITEM
DESCRIPTION
TORQUE
1
Stud (Qty 2)
25 N·m (18 ft. lbs.)
4
Nut (Qty 2)
8 N·m (72 in. lbs.),
then loosen 45
degrees
2
Bolt (Qty 4)
5
Nut (Qty 2)
3
Stud (Qty 2)
AN
ENGINE 4.7L
9 - 197
EXHAUST MANIFOLD (Continued)
(12) Install battery and connect cables.
(13) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
LEFT EXHAUST MANIFOLD
(1) Install exhaust manifold and gasket from below
engine compartment.
(2) Install lower exhaust manifold fasteners (Fig.
121). DO NOT tighten until all fasteners are in
place.
(3) Lower vehicle and install upper exhaust mani-
fold fasteners (Fig. 121). Tighten all manifold bolts
starting at center and working outward to 25 N·m
(18 ft. lbs.).
CAUTION: Over tightening heat shield fasteners,
may cause shield to distort and/or crack.
(4) Install exhaust manifold heat shield (Fig. 121).
Tighten fasteners to 8 N·m (72 in. lbs.), then loosen
45 degrees.
(5) Connect exhaust pipe to manifold.
(6) Connect negative cable to battery.
Fig. 121 Exhaust Manifold—Left
ITEM
DESCRIPTION
TORQUE
ITEM
DESCRIPTION
TORQUE
1
Stud (Qty 2)
25 N·m (18 ft. lbs.)
4
Nut (Qty 2)
8 N·m (72 in. lbs.),
then loosen 45
degrees
2
Bolt (Qty 4)
5
Nut (Qty 2)
3
Stud (Qty 2)
9 - 198
ENGINE 4.7L
AN
EXHAUST MANIFOLD (Continued)
VALVE TIMING
DESCRIPTION—TIMING DRIVE SYSTEM
The timing drive system (Fig. 122) 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 and two sec-
ondary timing chain drives.
OPERATION—TIMING DRIVE SYSTEM
The primary timing chain is a single inverted tooth
type. The primary chain drives the large fifty tooth
idler sprocket directly from a 25 tooth crankshaft
sprocket. Primary chain motion is controlled by a
pivoting leaf spring tensioner arm and a fixed guide.
The arm and the guide both use nylon plastic wear
faces for low friction and long wear. The primary
chain receives oil splash lubrication from the second-
ary chain drive and oil pump leakage. The idler
sprocket assembly connects the primary and second-
ary chain drives. The idler sprocket assembly con-
sists of two integral thirty tooth sprockets and a fifty
tooth sprocket that is splined to the assembly. The
spline joint is a non – serviceable press fit anti rattle
type. A spiral ring is installed on the outboard side of
the fifty tooth sprocket to prevent spline disengage-
ment. The idler sprocket assembly spins on a station-
ary idler shaft. The idler shaft is press-fit into the
cylinder block. A large washer on the idler shaft bolt
and the rear flange of the idler shaft are used to con-
trol sprocket thrust movement. Pressurized oil is
routed through the center of the idler shaft to pro-
vide lubrication for the two bushings used in the
idler sprocket assembly.
Fig. 122 Timing Drive System
1 - RIGHT CAMSHAFT SPROCKET AND SECONDARY CHAIN
2 - SECONDARY TIMING CHAIN TENSIONER (LEFT AND RIGHT
SIDE NOT COMMON)
3 - SECONDARY TENSIONER ARM
4 - LEFT CAMSHAFT SPROCKET AND SECONDARY CHAIN
5 - CHAIN GUIDE
6 - TWO PLATED LINKS ON RIGHT CAMSHAFT CHAIN
7 - PRIMARY CHAIN
8 - IDLER SPROCKET
9 - CRANKSHAFT SPROCKET
10 - PRIMARY CHAIN TENSIONER
11 - TWO PLATED LINKS ON LEFT CAMSHAFT CHAIN
12 - SECONDARY TENSIONER ARM
AN
ENGINE 4.7L
9 - 199
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