Camshaft Oil Seal: Service and Repair

CAMSHAFT AND CAMSHAFT 0IL SEAL





REMOVAL AND INSTALLATION

Required Special Tools:
^ MB990767: End Yoke Holder
^ MB991559: Camshaft Oil Seal Adapter
^ MD998443: Auto-lash Adjuster Holder
^ MD998713: Camshaft Oil Seal Installer
^ MD998715: Crankshaft Pulley Holder Pin







Required Special Tools:
^ MB990767: End Yoke Holder
^ MD998443: Auto-lash Adjuster Holder
^ MD998713: Camshaft Oil Seal Installer
^ MD998715: Crankshaft Pulley Holder Pin

REMOVAL SERVICE POINTS
<> ROCKER ARM AND SHAFT ASSEMBLY REMOVAL

1. Install special tool MD998443 as shown in the illustration so that the lash adjusters will not fall out.

CAUTION: Never disassemble the rocker arm and shaft assembly.

2. Loosen the rocker arm and shaft assembly mounting bolts, then remove the rocker arm and shaft assembly with the bolts still attached.

<> CAMSHAFT SPROCKET REMOVAL

1. Use special tools MB990767 and MD998715 to loosen the camshaft sprocket mounting bolt.
2. Remove the camshaft sprocket.

INSTALLATION SERVICE POINTS
>>A<< CAMSHAFT OIL SEAL INSTALLATION
1. Apply engine oil to the camshaft oil seal lip.

2. Use special tools MB991559 and MD998713 to press-fit the camshaft oil seal.

>>B<< CAMSHAFT SPROCKET INSTALLATION
1. Install the camshaft sprocket.

2. Use special tools MB990767 and MD998715 to tighten the camshaft sprocket mounting bolt to the specified torque.
Tightening torque: 88 ± 10 Nm (65 ± 7 ft. lbs.)

>>C<< DISTRIBUTOR INSTALLATION

1. Align the timing mark of the camshaft sprocket (right bank) with that of the cylinder head.

2. Align the mating marks on the distributor housing and coupling, then install the distributor to the engine.

>>D<< ROCKER ARM AND SHAFT ASSEMBLY INSTALLATION

1. Rotate the camshaft until the dowel pin on its front end is located as shown in the illustration.

NOTE: Placing the camshaft in the illustrated position minimizes the amount of cam lift, making it easier to install the rocker arm and shaft assembly.

2. Temporarily tighten the rocker shaft with the bolts so that all rocker arms on the inlet valve side do not push the valves.

3. Position the rocker shaft spring so that it takes a right angle against the plug guide.

NOTE: Set rocker shaft spring before installing the rocker arm and shaft assembly on the exhaust side.

4. Tighten the rocker arm and shaft assembly mounting bolts to the specified torque.
Tightening torque: 31 ± 3 Nm (23 ± 2 ft. lbs.)
5. Remove special tool MD998443.