Freightliner Century Class. Manual — part 6
Verification of Inspections Log
Verification of Inspections Log, Groups 01, 20, and 49
Date
Mileage
Item
Cost
Maintenance Facility
Group 01 — Engine Noise Panels, Engine Mounts, and Engine-Support Fasteners
Group 20 — Fan Clutch
Group 49 — Exhaust System Components
General Information
00
Verification of Inspections Log: 00–11
00/21
MOP Number
Engine Drive Belt Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–02
Engine Mount Inspection (Noise Emission Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03
Engine Noise Panel Inspection (Noise Emission Control). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–01
Engine-Support Fasteners Check (Noise Emission Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–04
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–00
Engine
01
Index, Alphabetical
01–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
01–01 Engine Noise Panel
Inspection (Noise
Emission Control)
If equipped, inspect for torn engine noise panels.
See
for Caterpillar noise panel locations. If
panels are torn, replace them with new panels; see
Group 01 of the Century Class Trucks Workshop
Manual for procedures. Cummins M11 and N14 en-
gines, and Detroit Diesel Series 55 and Series 60
engines do not have engine noise panels.
01–02 Engine Drive Belt
Inspection
Worn or loose drive belts may cause premature
bearing failure or engine overheating. Excessive ten-
sion, or too little tension on the belt may result in ex-
cessive and premature belt wear. Poly-V belts, or
serpentine belts are retained by a belt tensioner that
requires no tension adjustment. Replace the belt if
any conditions described in "Visual Inspection" are
found. V-belts are installed as individual belts, and as
matched sets. When replacing matched sets of belts,
always replace both belts at the same time. Matched
belts must be from the same manufacturer. To in-
spect a belt, gently twist the belt to view the belt
sidewalls and bottom. Inspect all drive belts for the
following conditions, then perform the "Belt Tension
Inspection":
Visual Inspection
1.
Inspect the belt for glazing. See
, Ref. A.
Glazing is represented by shiny sidewalls, and is
caused by friction created when a loose belt slips
in the pulleys. It can also be caused by oil or
grease on the pulleys.
2.
Check the belt for ply separation. See
Ref. B. Oil, grease, or belt dressing can cause
the belt to fall apart in layers. Repair any oil or
coolant leaks that are affecting the belts before
replacing the drive belts. Do not use belt dress-
ing on any belt.
3.
Check the belt for a jagged or streaked sidewall.
See
, Ref. C. Jagged or streaked sidewalls
are the result of foreign objects, such as sand or
gravel in the pulley, or a rough pulley surface.
4.
Check for tensile breaks; breaks in the cord
body. See
, Ref. D. Cuts in a belt are usu-
ally caused by foreign objects in the pulley, or by
prying or forcing the belt during removal or instal-
lation.
5.
Check for uneven ribs on serpentine (poly-V)
belts. See
, Ref. E. Foreign objects in the
pulley will erode the undercord ribs, causing the
belt to lose its gripping power.
6.
Check the drive belts for cracks. See
, Ref.
F. Small irregular cracks are usually signs of an
old belt.
f011040
1
2
11/29/95
1.
Oil Pan Noise Panel (C10 engine only)
2.
Left-Side Noise Panel (3406 engine only)
Fig. 1, Caterpillar Engine Noise Panels
Engine
01
01/1
7.
Inspect the pulleys for excessive play or wobble.
Excessive play or wobble indicates a failure of
the pulley bearing. Check for belt squealing or
squeaking. Replace bearings as needed.
NOTE: If it is difficult to distinguish the location
of a supposed bearing noise, place a stetho-
scope on the component being checked, not the
pulley, to isolate the area from outside interfer-
ence.
8.
Inspect all pulleys for foreign objects, oil, or
grease in the grooves.
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
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.
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
Engine
01
01/2
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