3A-56 - 454 C.I.D. (7.4L) / 502 C.I.D. (8.2L)
90-823224--2 796
Cleaning and Inspection
1. Clean all parts in solvent and dry with com-
pressed 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 25
lb. ft. (34 N·m).
4. Lubricate timing chain with engine oil. Install
crankcase front cover and torsional damper as
outlined.
Crankshaft Sprocket
Removal
1. Remove torsional damper and crankcase front
cover as outlined.
2. Remove camshaft timing chain as outlined.
3. Remove crankshaft sprocket using crankshaft
gear and sprocket puller (J-24420-B).
Installation
1. Using crankshaft gear and sprocket installer, as
shown, install sprocket on crankshaft.
72550
a
a - Crankshaft Gear And Sprocket Installer (J-1058-20)
2. Install timing chain as outlined.
3. Install crankcase cover and torsional damper as
outlined.
Checking Timing Chain Deflection
With timing chain and sprockets installed, check tim-
ing chain deflection, as follows:
1. Rotate camshaft (in either direction) to place ten-
sion on one side of the chain.
2. Establish a reference point on the block (on taut
side of chain) and measure from this point to the
chain.
3. Rotate camshaft in the opposite direction to
slacken the chain, then force chain out with fin-
gers and again measure the distance between
reference point and timing chain.
