Lumina V6-204 3.4L DOHC VIN X SFI (1996)
marks during final rotation to TDC.
^
DO NOT REVERSE ROTATION OF ENGINE.
11. Rotate the tensioner pulley counterclockwise applying 16-20 Nm (12-15 lb. ft.) torque.
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Use a helper to hold the crankshaft at TDC, and keep it from springing back.
12. Seat lock ring on the right exhaust and right intake camshaft into the bore by threading in the attaching bolt.
TIGHTEN
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Hold sprocket from turning using J 38614.
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Running torque that is, before seating) of bolt should be 6-90 Nm (44-66 lb. ft.).
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If less torque is required before seating, the shim ring and lock ring must be replaced and inspect the nose of the camshaft for brinelling.
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If more torque above 90 Nm (66 lb. ft.) is encountered before seating, the shim ring and lock ring must be replaced and inspect the attaching
bolt threads for burrs and/or foreign material.
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Seating of the lock ring is accomplished when edge is flush with sprocket hub.
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Bolt to 110 Nm (81 lb. ft.) to complete this step.
13. Remove J 38613 - right hand side only.
14. Rotate engine clockwise one revolution and realign the balancer marks at TDC. DO NOT REVERSE ROTATION OF ENGINE.
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Make sure timing mark on damper lines up with front cover timing mark.
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Use a helper to hold crankshaft from springing back.
15. Repeat step 12 for the left intake camshaft and then the left exhaust camshaft.
16. Remove J 38613 - left side.
17. Remove old timing marks. Mark the positions of each sprocket at TDC # 1 exhaust position with permanent paint.
18. Secondary timing belt cover.
19. Install cam carrier covers.
ALIGNING TIMING MARKS
If a valve timing driveability problem is discovered, it is not always necessary to go through a complete retiming of the valve train. Check to find the
cause of the problem. If the problem is found to be a slipped belt, find the reason for the slipping and retime the valve train. If the problem is caused
by the cam sprockets moving position in reference to the camshafts, a complete retiming will have to be performed.
