Freightliner FLA/FLB/FLC/FLD/FLL. Manual — part 8
Title of Maintenance Operation (MOP)
MOP Number
Engine Drive Belt Inspecting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–04
Engine Noise Panel Inspecting (Noise Emission Control). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–02
Engine Rear-Support Assembly Checking (Noise Emission Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–01
Jacobs Engine Brake Wiring Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03
Engine
01
Index, Alphabetical
Heavy-Duty Trucks Maintenance Manual, January 2007
01–01 Engine Rear-Support
Assembly Checking
(Noise Emission
Control)
Front and rear engine supports for vehicles built from
January 2007 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.
Visually inspect the rubber isolators (see
, Ref.
7 for an FLA, FLB, or FLD;
, Refs. 4 and 6 for
an FLC) for cracks, cuts, and other damage; replace
if damaged. Also, at engine overhaul or whenever
the engine has been removed, replace the isolators.
See Group 01 of the
Heavy-Duty Trucks Service
Manual
for isolator replacement procedures.
Check the engine rear-support fasteners for tight-
ness. See
for an FLA, FLB, or FLD, or
for an FLC.
See
for torque specifications.
1
2
3
4
5
6
7
8
9
10
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1.
Frame Rail
2.
Upper Mounting Bolt, Nut, and Washers
3.
Lower Mounting Bolt, Nut, and Washers
4.
Engine Rear Support Bolt and Washer
5.
Engine Leg
6.
Snubbing Washers or Wear Plate(s)
7.
Rubber Isolator
8.
Locknut, Washer, and Snubbing Washer
9.
Engine Mount
10. Spacer(s)
Fig. 1, Engine Rear-Support Assembly, FLA, FLB, and
FLD
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1
2
3
4
5
6
7
1.
Overslung Crossmember
2.
Engine-Support Bolt
3.
Transmission-Mounted Engine-Support Bracket
4.
Upper Isolator
5.
Frame-Mounted Engine-Support Bracket
6.
Lower Isolator
7.
Engine-Support Stop Nut
Fig. 2, Engine Rear-Support Assembly, FLC
Engine
01
Heavy-Duty Trucks Maintenance Manual, January 2007
01/1
Rear Engine-Support Fasteners Torque Specifications
Description
Size
Grade
Torque
*
:
lbf·ft (N·m)
Rear Engine-Support-Isolator Nut, FLA, FLB, and FLD
5/8–11
C
160 (216)
Rear Engine-Support-Isolator Stop Nut, FLC
1.00–8
B
280–380 (380–515)
Frame-Mounted Engine-Support-Bracket Nut
5/8–11
C
190 (258)
Transmission-Mounted Engine-Support-Bracket Capscrew, FLC
3/4–10
8
340 (461)
Overslung Crossmember Nut, FLC
1/2–13
C
95 (129)
*
Torque values are for dry, unplated fasteners.
Table 1, Rear Engine-Support Fasteners Torque Specifications
01–02 Engine Noise Panel
Inspecting (Noise
Emission Control)
If so equipped, inspect for torn engine noise panels.
See
for a Caterpillar engine, or see
for
a Cummins engine. If panels are torn, replace them
with new panels; see Group 01 of the
Heavy-Duty
Trucks Service Manual
for procedures. Cummins
M11 and N14 engines, and Detroit Diesel Series 55
and Series 60 engines do not have engine noise
panels.
01–03 Jacobs Engine Brake
Wiring Inspecting
Inspect the wiring from the dash switches to the en-
gine brake housings for breaks and for broken or
chafed insulation. Make sure that all terminal connec-
tions are in good condition and are fastened. Inspect
the wiring to the clutch and throttle switches. See
Group 01 of the
Heavy-Duty Trucks Service Manual
for the engine brake wiring diagram.
NOTE: Some engine brake installations do not
use clutch or throttle switches.
01–04 Engine Drive Belt
Inspecting
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 engine
drive belt if any conditions described in the visual
description are found. V-belts are installed as indi-
vidual belts, and as matched sets. When replacing a
matched set of belts, always replace both belts at the
same time. Matched belts must be from the same
manufacturer. To inspect a belt, gently twist the belt
to view the belt sidewalls and bottom. Visually in-
spect all drive belts for the following conditions, then
perform the belt tension inspection:
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1
2
3
05/27/93
NOTE: Caterpillar 3406E engines do not have right-side
noise panels.
1.
Right-Side Noise Panel
2.
Oil Pan Noise Panel
3.
Left-Side Noise Panel
Fig. 3, Caterpillar Engine Noise Panels
Engine
01
Heavy-Duty Trucks Maintenance Manual, January 2007
01/2
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 contamination 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 the signs of
an old belt.
7.
Visually 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 the bearings as
necessary.
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
NOTE: If engine drive belts require adjustment,
see Group 01 of the
Heavy-Duty Trucks Service
Manual.
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
Heavy-Duty Trucks Service Manual
to adjust belt
tension.
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1
2
3
4
4
01/16/96
1.
NTC Right-Side Noise Panels
2.
NTC Oil Pan Noise Panel
3.
NTC Left-Side Noise Panel
4.
L10 Front Gear Cover Noise Panel
Fig. 4, Cummins Engine Noise Panels
Engine
01
Heavy-Duty Trucks Maintenance Manual, January 2007
01/3
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