DETROIT DIESEL 53
FRESH WATER PUMP IDLER PULLEY ASSEMBLY
The fresh 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.
Wash the idler pulley bracket and pulley in clean fuel oil
Fig. 2. - Removing Shaft and Bearing Assembly
and dry them with compressed air. The idler pulley
and Bracket from 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
Revolve the shaft slowly in the bearing by hand. If
rough or tight spots are detected, the bearing and shaft
assembly must be replaced.
Fig. 3. - Installing Shaft and Bearing Assembly
Fig. 1. - Typical Fresh Water Pump Idler Pulley
Mounting in Idler Pulley
1971 General Motors Corp.
SEC. 5.1.1 Page 1