Maintenance
90
C2500CB-OM-EN-16
6.10 Belt Drive System
The engine uses a v-belt to drive the water pump, fan and alternator. It is important to
note that the v-belt is an integral part of the cooling and charging system and should
be inspected in accordance with the maintenance schedule.
Checking the Belt Drive:
Check the entire belt drive i.e. the belt(s) associated pulleys, bearings etc.
visually for signs of damage and wear and replace any damaged parts.
Check the tension on the belt.
Tension loose belts and replace belts showing signs of damage or wear.
Do Not
over tension the belt(s) as this will shorten the life of pulleys and
bearings.
When inspecting the belt check for:
Cracks
Chunking of the belt
Splits
Material hanging loose from the belt
Glazing, hardening
If any of these conditions exist the belt should be replaced with a genuine OEM belt.
To Check the Belt Tension:
Perform this check when the engine IS NOT running. Open the bonnet from the right
hand side of the truck and remove the access panel from the right hand side of the
truck to access the belt. Apply a force of 98Nm to the belt.
Diesel - Apply force half way between the
alternator pulley and the crankshaft pulley. The
belt should deflect by between 7mm and 9mm.
Toyota LPG - Apply force half way between the
alternator pulley and the water pump pulley. The
belt should deflect by between 9mm and 11mm.
GM LPG - Apply force half way between the
alternator pulley and the water pump pulley. The
belt should deflect by between 12mm and
14mm.
If the belt deflects by more or less than the
permissible amount the tension must be
adjusted.
Caution
Switch off the engine and remove the key from the ignition before working
on the belt drives.
When work on the belt drives has been completed, check that all guards
have been replaced and that all tools have been removed from the engine.
Belt Deflection x
