Dodge 2000 DURANGO Service Manual page 529

9 - 20 4.7L ENGINE
SERVICE PROCEDURES (Continued)
Fig. 11 Engine Top Dead Center (TDC) Indicator
1 – TIMING CHAIN COVER
2 – CRANKSHAFT TIMING MARKS
(3) Note the location of the V8 mark stamped into
the camshaft drive gears (Fig. 12). If the V8 mark on
each camshaft drive gear is at the twelve o'clock posi-
tion, the engine is at TDC on the exhaust stroke. If
the V8 mark on each gear is at the six o'clock posi-
tion, the engine is at TDC on the compression stroke.
(4) If both of the camshaft drive gears are off in
the same or opposite directions, the primary chain or
both secondary chains are at fault. Refer to Timing
Chain and Sprockets procedure in this section.
(5) If only one of the camshaft drive gears is off
and the other is correct, the problem is confined to
one secondary chain. Refer to Single camshaft tim-
ing, in this procedure.
(6) If both camshaft drive gear V8 marks are at
the twelve o'clock or the six o' clock position the
engine base timing is correct. Reinstall the cylinder
head covers.
Mark
SINGLE CAMSHAFT TIMING
NOTE: to adjust the timing on one camshaft, pre-
form the following procedure.
(1) Using Chain Tensioner Wedge, special tool
8350, stabilize the secondary chain drive. For refer-
ence purposes, mark the chain-to-sprocket position
(Fig. 13).
(2) Remove the camshaft drive gear retaining bolt.
(3) Carefully remove the camshaft drive gear from
the camshaft.
(4) Re-index the camshaft drive gear in the chain
until the V8 mark is at the same position as the V8
mark on the opposite camshaft drive gear.
NOTE: When gripping the camshaft, place the pli-
ers on the tube portion of the camshaft only. Do not
grip the lobes or the sprocket areas.
(5) Using a suitable pair of adjustable pliers,
rotate the camshaft until the alignment dowel on the
camshaft is aligned with the slot in the camshaft
drive gear (Fig. 14).
CAUTION: Remove
sprocket retaining bolt before reinstalling bolt. Fail-
ure to do so may cause over-torqueing of bolt
resulting in bolt failure.
(6) Position the camshaft drive gear onto the cam-
shaft, remove oil from bolt then install the retaining
bolt. Using Special Tools, Spanner Wrench 6958 with
Adapter Pins 8346 and a suitable torque wrench,
Tighten retaining bolt to 122N·m (90 ft. Lbs.) (Fig.
15) (Fig. 16).
(7) Remove special tool 8350.
(8) Rotate the crankshaft two full revolutions, then
reverify that the camshaft drive gear V8 marks are
in fact aligned.
(9) Install the cylinder head covers. Refer to Cylin-
der Head Cover in this section.
excess oil from camshaft
DN