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158 BASIC SERVICE
Drive Belt Replacement and Tensioning
General Information
The service life of the multi-groove belts is considerably improved over other systems
and allows the use of higher horsepower cooling fans. All D13F engines are equipped
with multi-groove belt systems.
In the dual multi-groove drive belt arrangement, the fan drive and coolant pump
are driven directly from the crankshaft pulley by a 10- or 12-rib multi-groove belt.
The alternator and the air conditioning compressor (if equipped) are driven off the
crankshaft pulley by a six-rib multi-groove belt (Figure 71). Two automatic tensioners
are used, one for the fan drive and one for the accessory drive.
The lower tensioner for the fan and coolant pump is mounted on the coolant pump
housing. This tensioner applies its load counterclockwise. The upper tensioner for the
alternator (and refrigerant compressor if so equipped) is mounted on the alternator
bracket. The tensioner applies its load in a counterclockwise direction.
Automatically Tensioned System
INSTALLATION
Swing the tensioner to the fully sprung position and without force, using belt tensioner
tool, J 44392, place the belt over the pulleys. Do not allow the tensioner to snap
against its stops. Do not pry the belt over a pulley.
TENSIONING
No tensioning adjustment is required. Once the tensioner is released against the belt,
the belt is tightened to optimum tension automatically at all speeds and loads.
MAINTENANCE
The condition of the belt and tensioner should be checked when performing preventive
maintenance inspections. Belt tension levels need not be checked as long as the
tensioner is in good condition and there is no evidence of a loose belt.
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