Drive Belt Tension
Engine Component Belt Tension: lbf (kg)
Caterpillar C10 (3176) Refrigerant Compressor 80 to 100 (36 to 45)
Caterpillar 3406E
Alternator and Refrigerant Compressor 40 to 50 (18 to 23), per belt
Fan 80 to 100 (36 to 45)
Cummins M11
Alternator 90 to 120 (41 to 55)
Fan 155 to 165 (70 to 75)
Refrigerant Compressor 80 to 100 (36 to 45)
Cummins N14
Alternator 40 to 50 (18 to 23), per belt
Fan 80 to 120 (36 to 55)
Refrigerant Compressor 80 to 100 (36 to 45)
Detroit Diesel Series 60
Alternator and Refrigerant Compressor 80 to 100 (36 to 45), Power Band
Fan 60 to 80 (27 to 36)
Table 1, Drive Belt Tension
Periodically inspect the rubber isolators for cracks,
cuts, wear, or damage, and replace them if neces-
sary. See Group 01 of the
Century Class Trucks
Workshop Manual
for isolator replacement
procedures.
01–04 Engine-Support
Fasteners Check (Noise
Emission Control)
Front and rear engine supports for vehicles built from
January 7007 require no periodic maintenance.
Mounts should be inspected when the engine is re-
moved for service. For vehicles manufactured prior to
January 2007, perform the following check.
Check the rear engine-support fasteners (see Fig. 3,
Ref. 4) for tightness. Tighten the 3/4-inch fasteners
215 to 265 lbf·ft (292 to 359 N·m).
Check the front engine-support fasteners for tight-
ness. Tighten the 5/8-inch fasteners 125 lbf·ft (170
N·m).
NOTE: At engine overhaul, and whenever the
engine has been removed, inspect the lower
and upper isolators (see Fig. 3, Refs. 1 and 6),
and replace them if they are worn; this applies
to both the front and rear isolators. See Group
01 of the
Century Class Trucks Workshop
Manual
for procedures.
f220047a
1
2
3
4
5
6
2
10/05/94
1. Lower Isolator
2. Engine-Support
Washer
3. 3/4–10 Capscrew
4. 3/4–10 Hexnut
5. Engine Mount
6. Upper Isolator
Fig. 3, Rear Engine Mount Isolators and Fasteners
Engine 01
Century Class Trucks Maintenance Manual, January 2007 01/3
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