With engine running, check blower drive. A worn blower drive, resulting in a loose, rattling sound within
blower can be detected with engine operating at idle 500 rpm.
Inspect rotor for loose rotor shafts or worn rotor bearings. Defective bearings will result in contact between
the rotor lobes, rotors and end plates or rotor and housing.
Inspect blower lobes for excessive backlash. Excessive backlash between blower timing gears will result
in rotor lobes rubbing along their entire length.
Install air shutdown housing.
5-59 Blower removal and disassembly
Whenever possible remove the blower, together with the governor drive, fresh water pump, fuel oil
pump, and the blower drive shaft cover. For removal of this assembly proceed as follows:
Drain cooling system.
Remove governor control housing assembly.
Disconnect fuel lines at fuel pump.
Loosen water pump connections at pump cover (inlet) and cylinder block.
Disconnect control wire from air shutdown valve shaft lever. Then remove bolt securing control wire clip to
air shutdown housing.
Remove air cleaner; then remove air inlet housing, gasket, striker plate and air inlet screen from blower.
Remove blower drive shaft.
Loosen blower drive shaft cover seal clamp at blower drive gear hub support.
Remove bolts and plain washers securing blower to cylinder block. Slide blower slightly forward, withdraw
blower drive shaft cover from seal, then lift blower away from cylinder block.
Removal of Accessories from the Blower
Remove three bolts and seal washer assemblies securing fuel pump to the blower rear end plate cover,
then remove fuel pump, gasket and drive coupling fork.
On current blower, loosen seal clamp securing blower drive shaft cover to blower end plate cover, then
remove cover, seal and clamp from the end plate cover.
Remove three bolts and seal washer assemblies securing fresh water pump to blower front end plate
cover, then remove water pump and gasket. If necessary, tap pump with a plastic hammer to loosen it.