DESCRIPTION AND OPERATION
Page 31
DRIVE BELTS
Depending on the vehicle, the fan location may
be high or low on the fan bracket. Two poly-V
belts drive the front engine accessories. The
outer, primary belt (10 ribs) drives the coolant
pump and fan hub from a pulley on the crankshaft
flange nested in the vibration damper. The inner,
secondary belt (six ribs), driven by the crankshaft
vibration damper, drives the alternator and
refrigerant compressor.
Each belt uses an automatic tensioner. In the
high position, there are two idler pulleys in the
primary loop: one between the coolant pump
pulley and the tension idler; the other between
the crankshaft pulley and the fan hub. In the low
position, the idler between the damper and fan
pulleys is omitted.
19
Figure 19 — Primary and Secondary Drive Belts —
Conventional and LCF Chassis
1. Conventional Chassis 2. LCF Chassis
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