Timing Chain: Service and Repair

Timing Chain

Removal
1. Remove and discard the camshaft oil seal. Service and Repair
2. Remove the engine front cover. Timing Cover
3. Remove the lower intake manifold Service and Repair






4. Remove the camshaft oil seal retainer.

5. CAUTION: This pulse wheel has two keyway slots and is used in several different engines. Install the pulse wheel in the keyway slot stamped 25, color coded blue.






Remove the Crankshaft Position (CKP) sensor pulse wheel.






6. Install the crankshaft pulley bolt and washer.
Remove the crankshaft position (CKP) sensor pulse wheel.


7. Install the crankshaft pulley retaining bolt and washer.






8. Rotate the crankshaft in a clockwise direction to position number one cylinder at top dead center(TDC) with the crankshaft keyway at the 11 o'clock position. If the camshafts are not positioned as shown, rotate the crankshaft one complete revolution.






9. Rotate the crankshaft in a clockwise direction to position the crankshaft keyway in the 3 o'clock position.
- The right-hand camshafts are in the neutral position.






10. NOTE: Mark the position of all chain drive components to make sure they are assembled in their original positions.
Remove the right-hand chain tensioner and tensioner arm.
1. Remove the bolts, the chain tensioner and the tensioner adapter plate right-hand, (if equipped).
2. Remove the chain tensioner.
3. Remove the timing chain tensioner arm.






11. Remove the right-hand timing chain.
1 Remove the timing chain guide.
2 Remove the right-hand timing chain.






12. Rotate the crankshaft in a clockwise direction approximately 600 degrees and position the crankshaft keyway at the 11 o'clock position.






13. Remove the crankshaft pulley bolt and washer.






14. NOTE: Mark the position of all timing chain tensioner components to make sure they are assembled in their original position.

Remove the left-hand chain tensioner and tensioner arm.
1 Remove the bolts.
2 Remove the chain tensioner.
3 Remove the tensioner arm.






15. Remove the left-hand tinning Chain
1 Remove the fixed chain guide.
2 Remove the left-hand timing chain.






16. Remove the tinning Chain sprockets.

Installation






1. Install the timing chain sprockets, crankshaft pulley washer and bolt.
1 Install the sprockets.
2 Install the washer and bolt.






2. Position the left-hand crankshaft as shown.
1. The mark on the intake camshaft at the 9 o'clock position.
2. The mark on the exhaust camshaft at the 12 o'clock position.
3. Remove the crankshaft pulley bolt and washer.






3. CAUTION: Make sure vise jaw protectors are used.
Loosely mount the left-hand timing chain tensioner in a vise.






4. CAUTION: During tensioner compression, do not release the ratchet stem until the tensioner piston is fully retracted into its bore, or damage to the ratchet stem will result.
Using a suitable pin, release the left-hand timing chain tensioner piston.

5. NOTE: The piston should retract with minimal force. If binding occurs, reposition the tensioner to eliminate side loading.

Slowly compress the left-hand timing chain tensioner, by using the vise.

6. NOTE: The retaining wire or paper clip must remain in the timing chain tensioner until the tensioner has been installed.

Timing Chain Tensioner:

Using suitable 1.5mm diameter wire or paper clip, lock the left-hand timing chain tensioner piston in position.






7. If the marks on the timing chain are not evident, use a permanent marker to mark the crankshaft and camshaft timing marks on the left-hand timing chain.
1. Mark any link to use as the crankshaft timing mark.
2. count 29 links from the crankshaft timing mark and mark this link.
3. Continue counting to link 42 and mark this link.

8. NOTE: Install the crankshaft with timing marks facing outwards.






Note: align the marks on the chain with marks on the camshaft sprockets.

Install the left-hand timing chain.
1 Install the timing chain guide.
2 Install the left-hand timing chain.






9. Install the left-hand tensioner
1. Install the left-hand timing chain tensioner arm.
2. Position the timing chain tensioner.
3. Install the bolts.

10. Remove the left-hand timing chain tensioner piston retaining wire.






11. Position the right-hand camshafts as shown.
1. The mark on the exhaust camshaft at the 12 o'clock position.
2. The mark on the intake camshaft at the 3 o'clock position.






12. Install the crankshaft pulley retaining bolt and washer.
Rotate the crankshaft in a clockwise direction to position the keyway at the 3 o'clock position.






13. Remove the crankshaft pulley retaining bolt and washer.

14. CAUTION: Make sure vise jaw protectors are used.
Loosely mount the right-hand timing chain tensioner in a vise.






15. CAUTION: During tensioner compression, do not release the ratchet stem until the tensioner piston is fully retracted into its bore or damage to the ratchet stem will result.
Using a suitable pin, release the the right-hand timing chain tensioner piston.






16. NOTE: The piston should retract with minimal force. If binding occurs, reposition the tensioner in the vise to eliminate side loading.
Slowly compress the right-hand timing chain tensioner, by tightening the vise.






17. NOTE: The retaining wire or paper clip must remain in position until the timing chain tensioner has been installed.






Using suitable 1.5 mm diameter wire or a paper clip, lock the left-hand timing chain tensioner piston in position.






18. If the timing marks on the timing chain are not evident, use a permanent marker to mark the crankshaft and camshaft timing marks on the right-hand timing chain.
1. Mark any link to use as the crankshaft timing mark.
2. Count 29 links from the crankshaft timing mark and mark this link.
3. Continue counting to link 42 and mark this link.

19. NOTE: Align the marks on the timing chain with the marks on the camshaft and crankshaft sprockets.






Install the right-hand timing chain.
1. Install the right-hand timing chain guide.
2. Install the right-hand timing chain.






20. Install the right-hand timing chain tensioner.
1. Install the right-hand timing chain tensioner arm.
2. Position the timing chain tensioner.
3. Install the bolts.
21. Remove the right-hand timing chain tensioner piston retaining wire.






22. Install the crankshaft pulley retaining bolt and washer.

23. NOTE: Ignore the timing flags on the rear of the camshaft sprockets.

NOTE: Check the number of timing chain links between the camshaft front timing marks and between the camshaft front timing marks and timing marks on the crankshaft sprockets.






Rotate the crankshaft approximately 120 degrees in a counterclockwise direction and check the timing.
1. There should be 12 chain links between the camshaft timing marks.
2. There should be 27 chain links between the camshaft and crankshaft timing marks.
3. There should be 30 chain links between the camshaft and crankshaft timing marks.






24. Remove the crankshaft pulley retaining bolt and washer.

25. CAUTION: This pulse wheel has two keyway slots and is used in several different engines.






Install the pulse wheel with the keyway in the slot stamped 25, color coded blue.






26. Install the camshaft oil seal retainer.
27. Install a new camshaft seal.
28. Install the lower intake manifold.
30. Install the engine front cover.