freightliner COLUMBIA CL112 Maintenance Manual page 34

Engine
Spring-Tension Type
On belts equipped with a spring tensioner, belt ten-
sion 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 away from the belt. When the breaker bar
is slowly released, the tensioner should return to its
original position. The tensioner should rotate
smoothly with no binding. If not, see Group 01 of the
Columbia ® Workshop Manual for replacement in-
structions.
NOTE: The following engines, which appear in
Table 1, are provided with automatic tensioners
for the fan and alternator belts.
01–03 Pacbrake Inspection and
Lubrication
With frequent use, the Pacbrake Exhaust Brake will
operate maintenance-free. If the vehicle is used in-
consistently or seasonally, it will be necessary to per-
form preventative maintenance. If the vehicle is ex-
posed to excess moisture, or is used only for
periodic or seasonal use, perform the following steps:
1. With the engine off, use any oil-free or non-
petroleum-based high-heat lubricant, and spray
or coat a sufficient amount on the restrictor valve
shaft and the attaching locations at each end of
the actuation cylinder.
2. With your hands or a pair of pliers, motion the
valve several times to distribute the lubricant
down the shaft and the attaching locations.
NOTE: Operation of the Pacbrake could be af-
fected by starting the engine and idling for short
periods of time. During a cold engine start-up,
moisture occurs in the engine and the exhaust
system that creates a corrosion hazard. The
brake housing may trap water in the valve shaft
bore causing corrosion, resulting in an improp-
erly functioning or non-functioning brake. If it is
necessary to periodically start the engine, attain
normal operating temperatures before shutting
down the engine.
Columbia Maintenance Manual, January 2007
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