TRUCK SERVICE MANUAL
ENGINE
The drive unit is used to transmit power from engine
Drive Unit
crankshaft, through camshaft gear, to drive a compressor,
Group 9
fuel pump, water pump and other assemblies. Usually, repair
consists of replacement of oil seals, bearings or bushings only.
Table 9-1: Drive Unit Specifications - Inch [mm]
Ref.
Worn
New
New
No.
Measurement
Limit
Minimum Maximum
7
Shaft
(Fig. 9-1)
Outside Diameter
1
1.310
1.3115 1.312
[33.27]
[33.312] [33.32]
4
Bushing
(Fig. 9-1)
Inside Diameter
2
1,321
1,312 1.315
[33.55]
[33,32] [33.40]
4
Bushing
(Fig. 9-1)
Out of Round
0.002
[0.05]
5
Shaft
(Fig. 9-2)
Outside Diameter
1
0.499
0.4995 0.5005
[12.67]
[12.687] [12.712]
6-11
Bushing
(Fig. 9-2)
Inside Diameter
2
0.6035
0.501 0.502
[12.789]
[12.73] [12.78]
12
Shaft
(Fig. 9-3)
Outside Diameter
1
0.870
0.8715 0.872
[22.10]
[22.136] [22.15]
13
Collar
(Fig. 9-3)
Inside Diameter
3
0.876
0.873 0.875
[22.25]
[22.17] [22.23]
33
Accessory Drive
End Clearance
0.005
0.010
[0.13]
[0.25]
34
Hydraulic Governor Drive
End Clearance
0.003
0.006
[0.08]
[0.151
FUEL PUMP DRIVE
Service Tools (Or Equivalent) Required
Bearings
Service
Tool
1. Bearings should be installed or removed from
Tool Number
Name
housing with an arbor press, using the right size and type
ST-850
Puller
of mandrel or plate. Pressing should be done on the
ST-1249
Puller
race that is press fit. When bearing is being pressed into
a housing, force should always be applied to outer ring.
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