Checking Drive Belt 1
Checking drive beltPreliminary work
1. Remove intake manifold (cowl).
Information
ATTENTION 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.
ATTENTION Consequential damage of broken pulley belt!
^ Due to a broken drive belt during driving, surrounding components (panelling, electric cables etc.) can be damaged by thrashing or flying belt parts.
^ Parts of the drive belt can jam behind deflection rollers or vibration balancers and damage surfaces and sealing rings there. In particular, the sealing ring of the crankshaft vibration balancer can become leaky as a result of a broken belt.
^ Following a belt breakage the surrounding components and the interior of the engine compartment must be inspected for damage, and if necessary damaged parts (sealing ring of the crankshaft vibration balancer, deflection rollers, panelling, lines, electric cables etc.) repaired or replaced.
^ The reason for the belt breakage must be established. Check deflection rollers or crankshaft vibration balancers for prior damage.
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.
^ '9000IN Work instructions after disconnecting the battery'
Damage symptoms
Note: The following table indicates damage which necessitates replacement.
Checking drive belt
Note: 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.
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
1. Fit intake manifold (cowl).