Chrysler Dodge Caravan 2002 Manual page 1315

9 - 114 ENGINE 3.3/3.8L
ENGINE BLOCK (Continued)
The cylinder walls should be checked for out-of-
round and taper with Tool C119 or equivalent (Fig.
46) (Refer to 9 - ENGINE - SPECIFICATIONS). If
the cylinder walls are badly scuffed or scored, the
cylinder block should be replaced, and new pistons
and rings fitted.
Fig. 46 Checking Cylinder Bore Size
Measure the cylinder bore at three levels in direc-
tions A and B (Fig. 46). Top measurement should be
10 mm (3/8 in.) down and bottom measurement
should be 10 mm (3/8 in.) up from bottom of bore.
(Refer to 9 - ENGINE - SPECIFICATIONS).
CAMSHAFT & BEARINGS (IN
BLOCK)
DESCRIPTION
The nodular iron camshaft is mounted in the
engine block and supported with four steel backed
aluminum bearings (Fig. 47). A thrust plate, located
in front of the first bearing, is bolted to the block and
controls the camshaft end play (Fig. 47). To distin-
guish camshafts between the 3.3L and 3.8L engines,
a cast-in ring is located between the rear bearing
journal and rear lobe (Fig. 48). The 3.3L engine
application is as-cast only. The 3.8L engine applica-
tion the cast ring is machined off.
OPERATION
The camshaft is driven by the crankshaft through
a timing chain and sprockets. The camshaft has pre-
Fig. 47 CAMSHAFT AND BEARINGS
1 - CAMSHAFT
2 - THRUST PLATE
3 - BOLT
4 - CAMSHAFT BEARINGS (SERVICED WITH BLOCK)
Fig. 48 CAMSHAFT IDENTIFICATION
1 - CAMSHAFT - 3.3L ENGINE
2 - CAST-IN RING
3 - CAMSHAFT - 3.8L ENGINE
4 - MACHINED CAST-IN RING
cisely machined (egg-shaped) lobes to provide accu-
rate valve timing and duration.
REMOVAL
(1) Remove the engine assembly from vehicle.
(Refer to 9 - ENGINE - REMOVAL)
Remove the cylinder heads. (Refer to 9 - ENGINE/
CYLINDER HEAD - REMOVAL)
(2) Remove the timing
sprocket. (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT/CHAIN
REMOVAL)
(3) Remove the hydraulic lifters. (Refer to 9 -
ENGINE/ENGINE BLOCK/HYDRAULIC LIFTERS
(CAM IN BLOCK) - REMOVAL). Identify each tappet
for reinstallation in original location.
RS
chain and camshaft
AND SPROCKETS -