Bonneville V8-4.6L VIN Y (2004)
Camshaft: Service and Repair
Setting Camshaft Timing
Setting Camshaft Timing
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Tools Required
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J 39946 Crankshaft Rotation Socket
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J 44214 Flywheel Holder
Setting the camshaft timing is necessary whenever the camshaft drive system has been disturbed such that the relationship between any chain and
sprocket has been lost. Even when only one sprocket is involved the following procedure should be observed since one crankshaft rotation will not
provide conditions where correct timing can be confirmed.
The camshafts and crankshaft events are correctly timed when the relationships shown exist. The following procedure explains how to establish this
condition. Correct timing exists when the crank sprocket and the intermediate shaft sprocket have their timing marks aligned and all four camshaft
drive pins are perpendicular (90 degrees) to the cylinder head surface.
1. Remove the following components for access:
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The left camshaft cover-
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The right camshaft cover-
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The engine front cover-
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The 3 chain tensioners- The tensioners may be in their installed positions but must be fully retracted.
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The oil pump-
2. The primary and secondary chain guides should be reinstalled if previously removed.
3. Rotate the crankshaft (2) until the sprocket drive key (1) is at approximately the 1 o'clock position. Use the J 39946 to rotate the crankshaft (2).
4. Install the crankshaft and the intermediate shaft sprockets to the primary drive chain with their timing marks adjacent to each other.
5. Install the crank and intermediate sprocket assembly (4) over their respective shafts.
6. Rotate the crankshaft (2) as necessary to engage the crankshaft key (1) in the sprocket without changing the relationship of the timing marks to
each other. Use the J 39946 to rotate the crankshaft (2).
Notice: Refer to Fastener Notice in Service Precautions.
7. Install the camshaft intermediate sprocket bolt (3).
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Tighten the camshaft intermediate sprocket bolt to 60 Nm (44 ft. lbs.).
8. Install the primary camshaft drive chain tensioner or release the tensioner shoe.
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Tighten the primary camshaft drive chain tensioner bolts to 25 Nm (18 ft. lbs.).
