Peterbilt 325 2017, Operator'S Manual, Page: 313 / 392

ENGINE
NOTE
See the engine manufacturer's oper-
ator's manual for further information
on replacing engine drive belts.
Engine Fan
WARNING!
Do not work on the fan with the en-
gine running. The engine fan can
engage at any time without warn-
ing. Before turning on the ignition,
be sure that no one is near the fan.
Failure to comply may result in death
or personal injury.
Your truck may be equipped with an
On/Off or Viscous Fan Drive. Follow
these guidelines to check your engine
fan:
Check the fan bearings for fan hub
bearing looseness, loss of lubricant
and any abnormal conditions. (For
example, fan belt misaligned or
excessive wear/damage.) Before
starting the engine and with the engine
off, look and feel for looseness in the
fan hub.
With the engine idling and the hood
open, stand at the front of the vehicle.
Listen for any noises coming from
the fan hub. Bearings that have lost
lubricant, and are dry, will typically emit
a squeal or a growl when the engine is
at operating temperature and the fan
clutch is engaged. If noise is detected,
have the fan bearings inspected by an
authorized dealership.
(03/17) Y53-6060-1C1
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