Viscous Fan Clutch (1-23)
Testing
Use a fan RPM measuring device to check the operation
of the viscous fan hub. A strobe or Cummins optical
tachometer, Part No. 3377462, can be used.
Mark a spot on the fan hub pulley and one fan blade so
the measuring device can determine the pulley and the
fan speed.Reflective tape, Part No. 3377464, inCummins
optical tachometer, Part No. 3377462, can be used to
mark the fan blade and the pulley. (Refer to Service Tools
Instruction, Bulletin No. 3377544, for more information.)
While the engine is still warm and the vehicle is shutoff,
cover the radiator grill.
Leave a hole approximately 0.3 m [1-foot] in diameter in
the cardboard to allow some air flow to the viscous fan
hub.
Start the engine. Idle the engine for 3 to 5 minutes. Lock
the throttle in a ″HIGH IDLE″ position.
On CELECT™ engines, use the PTO option to operate the
engine at maximum PTO engine RPM.
Refer to the N14 CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
Viscous Fan Clutch (1-23) Section 1 - Cooling System
N14Page 1-48
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