Timing Chain: Service and Repair

Timing Chain and Sprockets Replacement
Tools Required
* J5825-A Crankshaft Gear Remover
* J5590 Rear Pinion Bearing Race Installer

Removal Procedure





Notice: In order to rotate the engine install a bolt with the same threads as the crankshaft, but do not use the crankshaft balancer bolt or a bolt longer than 1 inch, in the crankshaft. Failing to do so will cause damage to the bolt threads and the crankshaft threaded hole when removing the bolt.

1. Remove the Crankshaft Position (CKP) sensor reluctor ring.
2. Install a 7/16-20 x 1 inch bolt into the end of the crankshaft.

Notice: Align the timing marks before removing the timing chain. If it is necessary to turn either the camshaft or the crankshaft with the timing chain removed, loosen or remove the valve rocker arms. Turning either the crankshaft or camshaft with the timing chain removed may cause the pistons to contact the valves, resulting in damage.

3. Rotate the crankshaft until:
3.1. The timing marks on both sprockets line up.
3.2. The number four cylinder is at Top Dead Center (TDC) of the compression stroke.





4. Remove the camshaft sprocket bolts.





5. Remove the camshaft sprocket and the camshaft timing chain.





6. Using J5825-A and an open end wrench, remove the crankshaft sprocket.





7. Remove the crankshaft balancer key.
8. Clean and inspect the timing chain and sprockets if necessary.

Installation Procedure





1. Install the key into the crankshaft keyway.
The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.





2. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.
3. Using J5590, install the crankshaft sprocket.





Important: Install the camshaft sprocket with the alignment mark at the 6 o'clock position.

4. Install the camshaft sprocket and the camshaft timing chain.

Crankshaft Sprocket aligned @ 12 o'clock Position & Camshaft Sprocket Aligned @ 6 o'clock Position:

5. Ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.





Notice: Refer to Fastener Notice in Service Precautions.
Fastener Notice


Important: Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug.

6. Install camshaft sprocket bolts.
Tighten the bolts to 25 Nm (18 ft. lbs.).
7. Remove the bolt that was installed in the end of the crankshaft.
8. Install the CKP sensor reluctor ring.