Specifications

Belt Tension Inspection
Threaded-Adjustment Type
1. Apply the parking brakes, and chock the tires to
prevent the vehicle from moving.
2. Install a belt tension gauge at the center of the
belt’s longest free-span. Check belt tension. See
Table 1 for belt tension specifications.
3. If belt tension is not correct, see Group 01 of the
Century Class Trucks Workshop Manual .
Spring-Tension Type
On belts equipped with a spring tensioner, the belt
tension is automatically adjusted. Check that the ten-
sioner is holding tension on the belt by inserting the
end of a breaker bar in the 1/2-inch square hole on
the forward face of the tensioner, and rotating the
tensioner down, away from the belt. When the
breaker bar is slowly released, the tensioner should
return to its original position. If not, see Group 01 of
the
Century Class Trucks Workshop Manual for re-
placement instructions.
01–03 Engine Mount Inspection
(Noise Emission
Control)
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. See Group
01 of the
Century Class Trucks Workshop
Manual
for procedures.
f150010a
A
B
C
D
E
F
11/21/94
A. Glazing
B. Separating Layers
C. Streaked Sidewalls
D. Tensile Break
E. Uneven Ribs
F. Cracks
Fig. 2, Drive Belt Replacement Conditions
Engine01
Century Class Trucks Maintenance Manual, January 200701/2