Removal

Disassembled Upper Engine:

Legend:

REMOVE OR DISCONNECT

NOTE: Before removing the timing chain, read the entire procedure.

1. Engine front cover.

Timing Chain Timed Position:

2. Rotate crankshaft clockwise (as viewed from front of engine / normal rotation) until the camshaft sprockets timing dowel pin hole(s) line up with the hole(s) in the timing chain housing.
- The mark on the crankshaft sprocket should line up with the mark on the cylinder block.
- The crankshaft sprocket keyway should point upwards and line up with the centerline of the cylinder bores. This is the "Timed" position.
3. Timing chain guides.
4. Raise the vehicle.
5. Make sure all the slack in the timing chain is above the tensioner assembly, then remove the chain tensioner.

The timing chain must be disengaged from any wear grooves in the tensioner shoe in order to remove the shoe. Slide a screwdriver blade under the timing chain while pulling the shoe outward.

If difficulty is encountered in removing the chain tensioner shoe, proceed as follows:
- Lower the vehicle.
- Hold the intake camshaft sprocket with J 39579 or equivalent and remove the sprocket bolt and washer.
- Remove the washer from the bolt and rethread the bolt back into the camshaft by hand (the bolt provides a surface to push against).
- Remove intake cam sprocket using a three-jaw puller in the three relief holes in the sprocket.

NOTE: Do not attempt to pry the sprocket off camshaft or damage to the sprocket or chain housing could occur.

Tensioner And Shoe Assembly:

6. Tensioner assembly retaining bolts and tensioner.
7. Timing chain.
8. Inspect parts for wear, replace as required. Some scoring of the timing chain shoe and guides is normal. Refer to Cylinder Head Assembly / Service and Repair / Additional Recommended Inspections. Service and Repair