Timing Components: Service and Repair

Timing Drive Components

CAUTION:This pulse wheel is used with several different engines. Install the pulse wheel with the keyway in the slot stamped "20-25-30 DAMB 30 RFF" only. This slot is also marked with an orange paint mark and aligns with the missing tooth in the trigger wheel.

1. Remove the engine front cover. Service and Repair

2. Remove the ignition pulse wheel.











3. Install the crankshaft damper bolt and washer.






4. Rotate the crankshaft clockwise to position the crankshaft keyway to the 9 o'clock position.






5. Rotate the crankshaft clockwise to position the crankshaft keyway to the 3 o'clock position.






6. Verify that the front two intake camshaft lobes are pointing up.






7. Compress the timing chain tensioner.
1 Release the racketing pawl.
2 Compress the timing chain tensioner and install a stiff wire or paper clip.






8. Remove the bolts and the RH timing chain tensioner.






9. CAUTION:If the RH timing chain tensioner arm is to be reused, mark the position to make sure that it is installed on the correct side when reassembled.

Remove the RH timing chain tensioner arm.






10. Remove the RH timing chain.






11. Remove the bolts and the RH Variable Camshaft Timing (VCT) solenoid housing assembly.






12. Rotate the crankshaft counterclockwise to position the crankshaft keyway to the 11 o'clock position.






13. Compress the timing chain tensioner.
1 Release the racheting pawl.
2 Compress the timing chain tensioner and install a stiff wire or paper clip.






14. Remove the bolts and the LH timing chain tensioner.





15. CAUTION:If the LH timing chain tensioner arm is to be reused, mark the position to make sure that it is installed on the correct side when reassembled.

Remove the LH timing chain tensioner arm.






16. Remove the LH timing chain.






17. Remove the LH VCT solenoid housing assembly.






18. Using a wrench on the flats of the camshaft, hold the camshaft in position and remove the bolt and the RH VCT actuator.

- Discard the bolt.






19. Using a wrench on the flats of the camshaft, hold the camshaft in position and remove the bolt and the RH exhaust camshaft sprocket.
- Discard the bolt.






20. Using a wrench on the flats of the camshaft:, hold the camshaft in position and remove the bolt and the LH VCT actuator.
- Discard the bolt.






21. Using a wrench on the flats of the camshaft, hold the camshaft in position and remove the bolt and the LH exhaust camshaft sprocket.
- Discard the bolt.






22. Remove the crankshaft sprockets.






Installation

1. Install the LH Variable Camshaft Timing (VCT) actuator and install a new bolt hand tight. Use a wrench on the flats of the camshaft to hold it in position and tighten the bolt in two stages.
- Stage 1: Tighten the VCT actuator bolt to 20 Nm (15 ft. lbs.).
- Stage 2: Tighten an additional 90 degrees.






2. Install the LH exhaust camshaft sprocket and install a new bolt hand tight. Using a wrench on the flats of the camshaft, hold the camshaft in position and tighten the bolt in two stages.
- Stage 1: Tighten the exhaust camshaft sprocket bolt to 20 Nm (15 ft. lbs.).
- Stage 2: Tighten an additional 90 degrees.






3. Install the RH Variable Camshaft Timing (VCT) actuator and install a new bolt hand tight. Using a wrench on the flats of the camshaft, hold the camshaft in position and tighten the bolt in two stages.
- Stage 1: Tighten the VCT actuator bolt to 20 Nm (15 ft. lbs.).
- Stage 2: Tighten an additional 90 degrees.






4. Install the RH exhaust camshaft sprocket and install a new bolt hand tight. Using a wrench on the flats of the camshaft, hold the camshaft in position and tighten the bolt in two stages.
- Stage 1: Tighten the exhaust camshaft sprocket bolt to 20 Nm (15 ft. lbs.).
- Stage 2: Tighten an additional 90 degrees.






5. With the two keyways lacing forward, install the crankshaft sprockets.






6. If timing marks in the timing chains are not evident, use a permanent-type marker to mark the crankshaft and camshaft timing marks on the LH and RH timing chains.
1 Mark any link to use as the exhaust camshaft timing mark.
2 Starting with the exhaust camshaft timing mark, count 16 links and mark the link as the intake camshaft sprocket timing mark.
3 Starting with the intake camshaft timing mark, count 25 links and mark the link as the crankshaft sprocket timing mark.






7. Verify that the crankshaft keyway is in the 11 o'clock position.






8. CAUTION:The crankshaft keyway must remain in the eleven o'clock position until the cams are located in the neutral position, or damage to the valves can occur.

Rotate the LH and RH intake and exhaust camshafts to locate them in their neutral positions.






9. NOTE: The gold colored bolt (No. 2 location) must be installed in its original location.

Install the LH VCT solenoid housing assembly and hand-tighten the bolts.
- Tighten in the sequence shown to 25 Nm (18 lb-ft).






10. Install the LH timing chain, aligning the copper (or marked) link with the marks on the camshaft and crankshaft sprockets.






11. Install the LH timing chain tensioner arm.






12. NOTE: Be sure to position the tensioner so that the tensioner piston is fully engaged in the tensioner arm.

Install the LH timing chain tensioner and bolts.






13. Remove the wire or paper clip from the tensioner.






14. Rotate the crankshaft clockwise and position the keyway at the 3 o'clock position for RH timing chain installation.






15. Verify that the copper (or marked) links on the LH timing chain are in alignment with the timing marks on the camshaft and crankshaft sprockets.






16. Install the RH VCT solenoid housing assembly and hand-tighten the bolts.
- Tighten in the sequence shown to 25 Nm (18 lb-ft).






17. Install the RH timing chain, aligning the copper or (marked) links with the marks on the camshaft and crankshaft sprockets.










18. Install the RH timing chain tensioner arm.






19. Install the RH timing chain tensioner and bolts.






20. Remove the wire or paper clip from the RH timing chain tensioner.






21. Rotate the crankshaft counterclockwise to position the crankshaft keyway to the 11 o'clock position.

22. CAUTION:Failure to verify correct timing drive component alignment will result in severe engine damage.

Verify that the timing component alignment is correct.
1. There should be 14 chain links between the exhaust and intake camshaft timing marks.
2. There should be 23 chain links between the camshaft and crankshaft timing marks.
3. There should be 28 chain links between the camshaft and crankshaft timing marks.

23. Remove the crankshaft damper bolt and washer.

24. CAUTION:This pulse wheel is used with several different engines. Install the pulse wheel with the keyway in the slot stamped "20-25-30 DAMB 30 RFF" only. This slot is also marked with an orange paint mark and aligns with the missing tooth in the trigger wheel.

Install the ignition pulse wheel using the orange marked keyway slot and the teeth facing forward.

25. If necessary, install new variable camshaft timing (VCT) system oil filters.

26. Install the engine front cover. For additional information, Service and Repair