454 CID (7.4L) / 502 CID (8.2L)
SERVICE MANUAL NUMBER 23
Page 3A-77
90-861326--1 MARCH 1999
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 timing chain deflection, as follows:
1. Rotate camshaft (in either direction) to place tension 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
fingers and again measure the distance between reference point and timing chain.
4. The deflection is the difference between these two measurements. If the deflection
exceeds 3/4 in. (19 mm), timing chain should be replaced.
72946
a
a-Reference Point
5. Install torsional damper and crankcase front cover.
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