Camshaft - Installation
Camshaft
All camshafts
NOTE: On early build engines, the timing chain rides on the inner side of the RH timing chain guide. Late build engines are equipped with a different design RH timing chain guide that requires the timing chain to ride on the outer side of the RH timing chain guide. For service, all replacement RH timing chain guides will be the late build design.
1. NOTICE: The crankshaft must remain in the freewheeling position (crankshaft dowel pin at 9 o'clock) until after the camshafts are installed and the valve clearance is checked/adjusted. Do not turn the crankshaft until instructed to do so. Failure to follow this process will result in severe engine damage.
Rotate the crankshaft counterclockwise until the crankshaft dowel pin is in the 9 o'clock position.
LH camshafts
2. NOTICE: The camshafts must remain in the neutral position during installation or engine damage may occur.
NOTE: Coat the camshafts with clean engine oil prior to installation.
Position the camshafts onto the LH cylinder head in the neutral position as shown.
3. NOTE: Cylinder head camshaft bearing caps are numbered to verify that they are assembled in their original positions.
Install the 8 camshaft caps and the 16 bolts.
- Tighten in the sequence shown to 10 Nm (89 lb-in).
RH camshafts
4. NOTICE: The camshafts must remain in the neutral position during installation or engine damage may occur.
NOTE: Coat the camshafts with clean engine oil prior to installation.
Position the camshafts onto the RH cylinder head in the neutral position as shown.
5. NOTE: Cylinder head camshaft bearing caps are numbered to verify that they are assembled in their original positions.
Install the 8 camshaft caps and the 16 bolts.
- Tighten in the sequence shown to 10 Nm (89 lb-in).
All camshafts
6. NOTICE: If any components are installed new, the engine valve clearance must be checked/adjusted or engine damage can occur.
NOTE: Use a camshaft sprocket bolt to turn the camshafts.
Using a feeler gauge, confirm that the valve tappet clearances are within specification. If valve tappet clearances are not within specification, the clearance must be adjusted by installing new valve tappet(s) of the correct size. For additional information, refer to Valve Clearance Check Adjustments.
LH camshafts
7. NOTE: Use a camshaft sprocket bolt to turn the camshafts.
Rotate the LH camshafts to the Top Dead Center (TDC) position and install the Camshaft Holding Tool on the flats of the camshafts.
8. Assemble the LH Variable Camshaft Timing (VCT) assembly, the LH exhaust camshaft sprocket and the LH secondary timing chain.
- Align the colored links with the timing marks.
9. Position the LH secondary timing assembly onto the camshafts.
10. Install 2 new bolts and the original washer. Tighten in 4 stages.
- Stage 1: Tighten to 40 Nm (30 lb-ft).
- Stage 2: Loosen one full turn.
- Stage 3: Tighten to 10 Nm (89 lb-in).
- Stage 4: Tighten 90 degrees.
11. Remove the lockpin from the LH secondary timing chain tensioner.
RH camshafts
12. NOTE: Use a camshaft sprocket bolt to turn the camshafts.
Rotate the RH camshafts to the TDC position and install the Camshaft Holding Tool on the flats of the camshafts.
13. Assemble the RH VCT assembly, the RH exhaust camshaft sprocket and the RH secondary timing chain.
- Align the colored links with the timing marks.
14. Position the RH secondary timing assembly onto the camshafts.
15. Install 2 new bolts and the original washer. Tighten in 4 stages.
- Stage 1: Tighten to 40 Nm (30 lb-ft).
- Stage 2: Loosen one full turn.
- Stage 3: Tighten to 10 Nm (89 lb-in).
- Stage 4: Tighten 90 degrees.
16. Remove the lockpin from the RH secondary timing chain tensioner.
All camshafts
17. Rotate the crankshaft clockwise 60 degrees to the TDC position (crankshaft dowel pin at 11 o'clock).
18. Install the primary timing chain with the colored links aligned with the timing marks on the VCT assemblies and the crankshaft sprocket.
19. Install the lower LH primary timing chain guide and the 2 bolts.
- Tighten to 10 Nm (89 lb-in).
20. Install the primary timing chain tensioner arm.
21. Reset the primary timing chain tensioner.
- Rotate the lever counterclockwise.
- Using a soft-jawed vise, compress the plunger.
- Align the hole in the lever with the hole in the tensioner housing.
- Install a suitable lockpin.
22. NOTE: It may be necessary to rotate the crankshaft slightly to remove slack from the timing chain and install the tensioner.
Install the primary tensioner and the 2 bolts.
- Tighten to 10 Nm (89 lb-in).
- Remove the lockpin.
23. As a post-check, verify correct alignment of all timing marks.
24. Inspect the VCT housing seals for damage and replace as necessary.
25. NOTICE: Make sure the dowels on the Variable Camshaft Timing (VCT) housing are fully engaged in the cylinder head prior to tightening the bolts. Failure to follow this process will result in severe engine damage.
Install the LH VCT housing and the 3 bolts.
- Tighten in the sequence shown to 10 Nm (89 lb-in).
26. NOTICE: Make sure the dowels on the Variable Camshaft Timing (VCT) housing are fully engaged in the cylinder head prior to tightening the bolts. Failure to follow this process will result in severe engine damage.
Install the RH VCT housing and the 3 bolts.
- Tighten in the sequence shown to 10 Nm (89 lb-in).
27. Install the engine front cover. For additional information, refer to Engine Front Cover Engine Front Cover - Installation.