Install drive belt

Only if the drive belt is torn: Checking the injector shafts for coolant residues and cleaning if necessary

NOTE: TECHNICAL INFORMATION
If the drive belt breaks, the combustion engine can run hot. Therefore the injector shafts must be checked for coolant residues.
If the combustion engine has run hot, the coolant can overflow from the coolant expansion tank and get into the injector shafts.

NOTE: RISK OF DAMAGE
Injectors contaminated with coolant.
Damage and failure of injectors that have been wetted with coolant for a long time.

Covering injectors with suitable auxiliary materials before testing or topping up the coolant is mandatory.
Always cover injectors with suitable aids before working on the cooling system in the vicinity of the injectors.
If necessary draw off all of the coolant from the coolant expansion tank.
Always clean injectors or injector shafts contaminated with coolant (e.g. with compressed air).

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CAUTION: Swirling dirt particles caused by compressed air.
Injury hazard!

Collect dirt particles, e.g. when blowing out, use cloth to do so.
Wear safety goggles.

CAUTION: Materials harmful to health.
Contact with fluids harmful to health!

Note and follow safety instructions on containers.
Conduct all work in appropriate personal protective equipment only.

Check the injector shafts for coolant residues (1).
If there are coolant residues (1) in the injector shaft: Clean the injector shafts with an air gun (2).
NOTE: For a better overview the removed condition is shown here.
Note the course of the belt (1).
Diagram S63T4

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NOTE: For a better overview the removed condition is shown here.
Note the course of the belt (1).
Diagram N63T3

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Put on the drive belt (1).

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Maintain the preload of the belt tensioner (1) using a suitable socket wrench (3).
Remove the special tool 0 496 268 (11 0 390) (2) from the belt tensioner.

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Loosen the belt tensioner (2) counterclockwise using a suitable socket wrench (1).

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