CAUTION: When camshaft sprocket bolts are loos-
ened or removed, the camshafts must be re-timed
to the engine. Also, the camshaft sprocket bolts
must NOT be reused.
(1) Remove front timing belt covers. (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - REMOVAL)
(2) Position crankshaft sprocket to the TDC mark
on the oil pump housing by turning crankshaft in the
clockwise direction (Fig. 147).
(3) Install a dial indicator in number 1 cylinder to
check TDC of the piston (Fig. 148). Rotate the crank-
shaft until the piston is at exactly TDC.
(4) Remove camshaft retainer/thrust plates from
rear of cylinder heads. To access the right side plate,
remove the EGR valve. (Refer to 25 - EMISSIONS
CONTROL/EXHAUST GAS RECIRCULATION/
VALVE - REMOVAL)
NOTE: Special Tool 6642 is interchangeable
between cylinder banks.
(5) Install Special Tools 6642 Camshaft Alignment
tools to the rear of each cylinder head by inserting
pin on the alignment tool to the pilot hole on the
camshaft. Attach tools using the retainer plate bolts.
(Fig. 149).
NOTE: If the alignment tools do not properly line-up
to install attaching bolts, first remove the timing
belt tensioner, then slowly rotate camshaft with a
wrench until bolts can be installed.
(6) Remove the timing belt. (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT/CHAIN AND
SPROCKETS - REMOVAL)
(7) Hold camshaft sprocket with 36 mm (1 7/16 in.)
box end wrench.
Fig. 147 Camshaft Sprocket Timing Marks
1 - ALIGN CAMSHAFT SPROCKET TIMING MARK BETWEEN
MARKS ON REAR TIMING BELT COVER
2 - CRANKSHAFT AT TDC
Fig. 148 Dial Indicator
Fig. 149 Camshaft Alignment Holding Tools
1 - LEFT CAMSHAFT PILOT HOLE
2 - RIGHT CAMSHAFT PILOT HOLE
3 - CAMSHAFT ALIGNMENT SPECIAL TOOLS 6642
LH ENGINE 3.5L 9 - 173
TIMING BELT AND SPROCKETS (Continued)
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