Rocker Arm Assembly: Service and Repair

REMOVAL

Fig. 68 Camshaft Replacement:

Remove camshaft in numbered sequence, Fig.68, noting the following:
1. Use camshaft sprocket holder and adapter tools No. C-4687 and C-4687-1, or equivalent, to ensure camshaft sprockets do not turn during removal.
2. Mark and identify intake camshaft and exhaust camshaft before removal as they are not interchangeable.

Fig. 69 Camshaft Bearing Caps:

3. Loosen camshaft bearing cap attaching bolts in sequence shown in Fig.69, one camshaft at a time.
4. Remove camshaft oil seals using suitable screwdriver to pry seal out.

INSTALLATION

Fig. 70 Camshaft Oil Seal Installation:

1. Install new camshaft oil seals using special oil seal seating tools No. MB991554 and MB998713, or equivalents, Fig.70.
2. Ensure piston is not at top dead center when installing camshaft.

Fig. 69 Camshaft Bearing Caps:

3. Install camshaft bearing cap attaching bolts in sequence shown in Fig.69, one camshaft at a time. Tighten to specifications.
4. Use camshaft sprocket holder and adapter tools No. C-4687 and C-4687-1, or equivalents, to ensure camshaft sprockets do not turn during installation.

Fig. 71 Cylinder Head Cover Installation:

5. Install cylinder head cover assembly to head and tighten in sequence shown in Fig.71.
Torque in three steps:
First to 3.3 ft.-lbs.,
Then to 6.6 ft.-lbs.,
Finally to 8.9 ft.-lbs.