Checking Drive Belt

WM 137801 Checking drive belt

Preliminary work

Preliminary work

1. Remove intake manifold (cowl).

Information

Information

Caution:
Risk of damage to drive belt!
If the drive belt is removed when it is hot, it may become deformed and damaged.

- Never remove drive belt when it is hot.

Caution:
Drive belt breaks and becomes jammed
Risk of damage to components (trim panels, electric cables, etc.)
Sealing ring on crankshaft vibration balancer can start to leak
Vibration balancer can overheat and lose its strength

- Following belt breakage, check adjacent components and the interior of the engine compartment for damage, and repair or replace damaged parts if necessary.

- Find out why the belt broke. Check deflection rollers or crankshaft vibration balancer for prior damage.

- If the drive belt is jammed, replace vibration balancer.

Warning:
Danger of injury!
The vehicle fans can continue running or start up automatically.

- The power supply to the radiator fans or the battery must be disconnected before starting to work on the radiator or fans.





Installation position of drive belt

Damage symptoms

Information:
The following table indicates damage which necessitates replacement.








Checking drive belt

Checking drive belt

Information:
If spark plugs must be changed in the course of maintenance operations, the drive belt should be checked when the spark plugs are removed. The engine can then be cranked easier.

1. Using chalk, mark the drive belt in the area around the tensioning roller.





Marking on the drive belt

2. Turn engine at the vibration damper in the direction of movement using a socket wrench (a/f 27) until the chalk mark is at the same place again. While turning at the crankshaft, check the belt at the deflection rollers for signs of damage.

Subsequent work

Subsequent work

1. Fit intake manifold (cowl).