Oil Pump Drive Shaft: Service and Repair
OIL PUMP CHAINREMOVAL AND INSTALLATION
Pre-removal & Post-installation Operation:
Removal Steps 1-7:
Required Special Tool:
^ MB991346: Top Cover Wrench
REMOVAL SERVICE POINT
[A] ENGINE OIL PUMP SPROCKET CENTER BOLT/ENGINE OIL PUMP DRIVE CHAIN AND ENGINE OIL PUMP SPROCKET REMOVAL
1. Hold the engine oil pump sprocket with special tool MB991346.
2. Loosen the engine oil pump sprocket center bolt and remove the engine oil pump drive chain and engine oil pump sprocket.
INSTALLATION SERVICE POINTS
[A] CRANKSHAFT SPROCKET INSTALLATION
1. Wipe off the dirt on the crankshaft sprocket and crankshaft as shown in the figure using a rag, and then degrease them.
NOTE: Degrease them to prevent drop in the friction coefficient of the pressed area, which is caused by oil adhesion.
2. Install the crankshaft sprocket to the crankshaft.
[B] ENGINE OIL PUMP SPROCKET/ENGINE OIL PUMP DRIVE CHAIN/ENGINE OIL PUMP SPROCKET CENTER BOLT INSTALLATION
1. Set the number 1 cylinder to the top dead center of compression.
2. Install the engine oil pump sprocket to the engine oil pump drive chain.
3. Install the engine oil pump drive chain in the crankshaft sprocket while the engine oil pump sprocket is installed in the engine oil pump drive chain.
4. Install the engine oil pump sprocket in the engine oil pump assembly while the engine oil pump sprocket is installed in the engine oil pump drive chain.
5. Hold the engine oil pump sprocket with special tool MB991346 in the same manner as removal.
6. Tighten the engine oil pump sprocket center bolt to the specified torque.
Tightening torque: 23 ± 2 Nm (17 ± 1 ft-lb)