Installation

1. NOTE: If engine has "jumped time," ensure that all service to engine components and/or valve train have been made.

NOTE: Make sure primary and secondary timing chain tensioners are in collapsed position and retained with clip.

Crankshaft Position:

If cylinder head was removed from cylinder block, position crankshaft keyway to 270 degrees (or at nine o'clock position).

2. NOTE: The rocker arms must not be installed in the cylinder heads at this time. Install cylinder heads on cylinder block.

LH Camshafts Keyways:

3. Install Camshaft Positioning Tool T93P-6256-A into D-slots on rear of camshafts to position both intake and exhaust camshafts with the keyways pointing down towards crankshaft.

4. NOTE: Do not remove Camshaft Holding Tool T93P-6256-AH from camshafts until all parts are installed and tightened.

Install Camshaft Holding Tool T93P-6256-AH on center of camshafts.
5. If removed, install LH secondary timing chain tensioner. Tighten retaining bolts to 8-12 Nm (70-106 in/lb).

Secondary Timing Chains:

6. If removed, install LH secondary camshaft sprockets and secondary timing chain as an assembly with hubs of camshaft sprockets facing as shown in the illustration.
7. Remove locking pin from secondary timing chain tensioner.
8. Install LH primary camshaft sprocket and camshaft sprocket spacer (6265) on LH camshaft.

9. NOTE: Secondary camshaft sprockets must be free to turn.

Install washers and camshaft sprocket retaining bolts; finger-tight only.

Secondary Timing Chain Tensioner:

10. Install Timing Chain Tensioning Tool T93P-6256-BH on LH secondary timing chain tensioner.

Fig. 18 Camshaft Positioning Tool Installation:

11. CAUTION: Failure to use Camshaft Holding Tool T93P-6256-AH while assembling or disassembling timing chains will result in damage to D-slots or Camshaft Positioning Tool T93P-6256-A.

Install Camshaft Positioning Tool T93P-6265-A into D-slots.
12. Install Camshaft Holding Tool T93P-6256-AH at center area of LH intake and exhaust camshafts.
13. Tighten camshaft sprocket bolts to 110-130 Nm (81-95 lb/ft).
14. NOTE: Remove Camshaft Positioning Tool and Camshaft Holding Tool. Repeat Steps 1 through 13 for RH cylinder head.

Fig. 26 Crankshaft Sprocket Position:

15. NOTE: Crankshaft sprockets are identical. They may only be installed one way. Refer to the illustration for proper crankshaft sprockets installation.

Install LH crankshaft sprocket.

16. NOTE: Make sure tapered part of crankshaft sprocket faces away from cylinder block for LH primary timing chain crankshaft sprocket.

Marking The Timing Chain:

NOTE: If colored links of timing chain are not visible, split both chains in half and mark the two opposing links as shown.

Timing Marks:

Install LH primary timing chain on LH primary camshaft sprocket. Make sure copper link of timing chain lines up with timing mark of camshaft sprocket.
17. Install LH primary timing chain on crankshaft sprocket. Make sure copper link of timing chain lines up with timing mark of crankshaft sprocket.

18. NOTE: Make sure tapered part of crankshaft sprocket faces toward cylinder block for RH primary timing chain crankshaft sprocket.
Repeat Steps 14,15 and 16 for RH primary timing chain.

19. NOTE: For timing chain guides two bolts to the cylinder head are longer than the bolt to the cylinder block.

Timing Chain Guides:

Install RH and LH timing chain guides and secure with three bolts on each. Tighten bolts to 8-12 Nm (71-106 in/lb).

RH Timing Chain Tensioner:

20. Lubricate timing chain tensioner arm contact surfaces with engine oil and install RH and LH timing chain tensioner arms using one bolt each. Tighten to 10-15 Nm (7-11 ft/lb).

21. Unlock the primary tensioner ratcheting device (using a small pick or similar tool, hold ratchet lock mechanism away from ratchet stem).

22. CAUTION: Tensioner must be compressed slowly or rupture of tensioner body casting will result from excessive hydraulic pressure. Failure to release ratchet lock mechanism while compressing piston will result in ratchet damage.

Slowly compress primary tensioner piston in small increments with minimal force.
23. Lock the primary tensioner ratcheting device with a small pin (paper clip) once the tensioner is fully compressed and the ratchet stem is flush to the tensioner body.

24. NOTE: Do not remove lock pins until timing chain guides are installed.

Install RH and LH primary timing chain tensioners and secure with two bolts on each. Tighten bolts to 20-30 Nm (15-22 ft/lb).
25. Remove lock pins from primary timing chain tensioners and make sure all timing marks are aligned.
26. Install crankshaft position sensor pulse wheel with hub facing crankshaft sprocket.
27. Install rocker arms.

28. NOTE: When cleaning sealing surfaces of the engine front cover and oil pan-to-cylinder block joints, use extreme caution not to damage the rubber bead of the oil pan gasket (6710). If a leak should occur upon reassembly, remove the oil pan and replace the oil pan gasket.

Install engine front cover.
29. Start engine and check for leaks and proper operation.