Timing Chain: Service and Repair

Fig. 16 Aligning timing marks.:

Removal

1. Remove timing cover, then rotate crankshaft until timing marks are aligned as shown in Fig. 16, and ensure is at TDC of No. 1 cylinder compression stroke.

Fig. 17 Timing chain tensioner removal.:

2. Tilt chain tensioner over as far as possible and install retaining tool Mot. 761 or equivalent, Fig. 17, then remove chain tensioner and retaining tool as an assembly. Use assembly plate from Mot. 761 to disconnect tensioner from retaining tool for inspection.
3. Remove camshaft sprocket retaining bolt.
4. Remove camshaft sprocket and timing chain using suitable puller to release sprocket from camshaft.
5. Install bolt in nose of crankshaft, then remove crankshaft sprocket using suitable puller.

Installation

1. Install crankshaft sprocket using suitable driver, ensuring timing mark faces out.

Fig. 16 Aligning timing marks.:

2. Install camshaft sprocket with timing chain, aligning timing marks as shown, Fig. 16.
3. Torque camshaft sprocket retaining bolt to 22 ft.lbs.

Fig. 18 Main oil gallery plug & chain tensioner locating dowel.:

4. Ensure that main oil gallery plug (A), Fig. 18, is in position, then insert locating dowel (B) for chain tensioner.

Fig. 19 Timing chain tensioner assembly.:

5. Assemble chain tensioner onto assembly plate in numerical order shown in Fig. 19, then install holding tool Mot. 761, rotating tensioner as far as possible to the right.

Fig. 18 Main oil gallery plug & chain tensioner locating dowel.:

Fig. 19 Timing chain tensioner assembly.:

6. Remove tensioner and holder assembly from support plate, then mount on engine block ensuring dowel (B) engages slot (D) in tensioner shaft and free end of spring (F) is in hole (C) in block, Figs. 18 and 19.
8. Tighten tensioner bolt, then remove holding fixture.
9. Install timing cover as outlined.