BLOWER DRIVE GEAR AND SUPPORT ASSEMBLY
The blower drive gear is mounted on the blower drive
gear support and in addition to driving the blower, drives
the governor, water pump and fuel pump. The drive is
cushioned by a spring-loaded flexible coupling, see
Figs. 1 and 5 which insures a uniform rotation of the
The right-hand helix blower drive gear is driven by the
The ratio of blower speed to engine speed is 2.00:1.
A new blower drive support assembly has replaced the
former assembly (Fig. 2). The new and former blower
drive assemblies are different in that the flanged
bearing, which also served as a thrust surface, has been
replaced by a new bearing. The inner bearing of the
Fig. 1. Typical Blower Drive Gear and Support
new assembly protrudes slightly from the inner face of
the support to facilitate installation of and to serve as a
pilot for the thrust washer.
Remove and Install Blower Drive Shaft
If the blower drive shaft is not broken, it may be
removed as follows:
Remove the six bolts (94 and 95) that secure the
flywheel housing small hole cover (92), see Fig. 1.
Refer to Fig. 4 and remove the snap ring and pull
the blower drive shaft out of the drive assembly.
NOTE: Some shafts have a tapped
hole in the end which can be used as
an aid in removing the shaft.
If the blower drive shaft is broken and it is not possible
to remove all of the pieces, it will be necessary to
remove the blower, see Page 10-49.
A broken drive shaft indicates an unusual loading which
may have been caused by a bearing failure or other
malfunction. Inspect the blower drive, blower rotors and
the housing before replacing the drive shaft. See the
Reverse Steps 1 and 2 for the installation of the blower
Fig. 2. Blower Drive Support Assembly