454 CID (7.4L) / 502 CID (8.2L) SERVICE MANUAL NUMBER 23
Page 3A-76
90-861326--1 MARCH 1999
Timing Chain and Sprocket
Removal
1. Remove torsional damper, oil pan and front cover as outlined.
2. Turn crankshaft until timing marks on crankshaft and camshaft sprockets are in align-
ment as shown.
72946
b
a
a-Timing Marks Aligned
b-Locating Pin
3. Remove camshaft sprocket and timing chain. If sprocket does not come off easily, a light
tap on the lower edge of the sprocket, using a plastic mallet, should dislodge it.
4. If crankshaft sprocket requires replacement, remove as outlined.
Cleaning and Inspection
1. Clean all parts in solvent and dry with compressed air.
2. Inspect timing chain for wear and damage.
3. Inspect sprockets for wear and damage.
Installation
1. If crankshaft sprocket was removed, install as outlined in “Crankshaft Sprocket.”
2. Install timing chain on camshaft sprocket. Hold sprocket vertical with chain hanging
down. Align marks on camshaft and crankshaft sprockets.
IMPORTANT: Do not attempt to drive sprocket on camshaft, as welsh plug at rear of
engine can be dislodged.
3. Install sprocket on camshaft. Torque bolts to 22 lb-ft (30 Nm).
4. Lubricate timing chain with engine oil. Install crankcase front cover and torsional damper
as outlined.
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