TM 5-3895-346-14
WATER PUMP IDLER PULLEY ASSEMBLY
ENGINE OVERHAUL
WATER PUMP IDLER PULLEY ASSEMBLY
The water pump idler pulley assembly is mounted on the upper engine front cover (Fig. 1).
Remove Idler Pulley Assembly
Remove the two attaching bolts and lift the pulley assembly away from the front cover and drive belts.
Disassemble Idler Pulley Assembly
1. Support the pulley, then press the shaft and bearing assembly and bracket from the pulley by applying
pressure to the outer race of the bearing (Fig. 2).
2. Support the bracket, then press the shaft and bearing assembly from the idler pulley bracket by
applying pressure on the shaft only.
Inspection
Wash the idler pulley bracket and pulley in clean fuel oil and dry them with compressed air. The idler pulley
shaft and bearing assembly must not be washed in fuel oil. If the bearing is immersed in cleaning fluid, dirt
may be washed in and the fluid and dirt could not be entirely removed from the bearing.
Examine the bracket and pulley for excessive wear or cracks.
Revolve the shaft slowly in the bearing by hand. If rough or tight spots are detected, the bearing and shaft
assembly must be replaced.
On early engines, if the bracket or bearing assembly requires replacement, the complete idler pulley assembly
must be replaced. The bearing bore diameter on the current bracket is 0.6237-0.6247 inch. On the former
bracket, the bearing bore diameter is 0.6242-0.6252 inch.
Figure 1. Typical Fresh Water Pump Idler
Figure 2. Removing Shaft and Bearing
Pulley Mounting
Assembly and Bracket from Idler Pulley
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