Freightliner Business Class M2. Manual — part 6
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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 Drive Belt
Inspecting
Worn or loose drive belts may cause premature pul-
ley bearing failure or engine overheating. Too much
or too little tension on the belt may result in exces-
sive or premature belt wear. Replace the engine
drive belt if any conditions described under Visual
Inspection are found.
Visually inspect all drive belts, then perform the belt
tension inspection. To inspect a belt, gently twist the
belt to view the belt sidewalls and the underside of
the belt. When replacing a matched set of belts, al-
ways replace both belts at the same time. Matched
belts must be from the same manufacturer.
Visual Inspection
For examples of drive belt conditions, see
1.
Inspect the belt for glazing. Shiny sidewalls are
evidence of glazing, which is caused by friction
created when a loose belt slips in the pulleys. It
can also be caused by oil or grease contamina-
tion on the pulleys.
2.
Check for tensile breaks or breaks in the cord
body. Cuts in a belt are usually caused by for-
eign material in the pulley or by prying or forcing
the belt during removal or installation.
3.
Check the belt for ply separation. 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 dressing on any belt.
4.
Check for uneven ribs on serpentine (poly-V)
belts. Foreign material in the pulley will erode the
undercord ribs causing the belt to lose its grip-
ping power.
5.
Check the belt for a jagged or streaked sidewall.
Jagged or streaked sidewalls are the result of
foreign material, such as sand or gravel, in the
pulley, or a rough pulley surface.
6.
Check the drive belts for cracks. Small, irregular
cracks are usually indication 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, obtain a stetho-
scope and place it on the component being
checked, not the pulley, to isolate the area from
outside interference.
8.
Inspect all pulleys for foreign material, oil, or
grease in the grooves.
If the engine drive belt needs to be replaced, see
Group 01 of the Business Class® M2 Workshop
Manual.
Belt Tension Inspection
Engine drive belts on the Mercedes-Benz and Cater-
pillar engines have belt tensioners that automatically
adjust the tension on the belt. These belts do not
require adjustment.
Caterpillar 3126 Engine
Inspect the belt tensioner for unusual noise and ex-
cessive looseness or shaking of the pulley bearings.
See
. If the belt tensioner requires disassem-
bly, refer to the engine service manual.
01–02 Engine Support Fastener
Checking
Front and rear engine supports for vehicles built from
January 2007 require no periodic maintenance.
Mounts should be inspected when the engine is re-
Engine
01
Business Class M2 Maintenance Manual, August 2015
01/1
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moved for service. For vehicles manufactured prior to
January 2007, perform the following check.
1.
Check the tightness of the engine support fasten-
ers at the rear of the engine. Tighten the fasten-
ers 241 lbf·ft (460 N·m).
2.
Check the tightness of the engine support fasten-
ers at the front of the engine. Tighten the fasten-
ers 136 lbf·ft (327 N·m).
NOTE: When the engine is removed, inspect
the lower and upper isolators for wear. Replace
the isolators if necessary.
f150010b
07/12/2001
1
2
3
4
5
6
1.
Glazing
2.
Tensile Break
3.
Separating Layers
4.
Uneven Ribs
5.
Streaked Sidewalls
6.
Cracks
Fig. 1, Drive Belt Replacement Conditions
07/12/2001
f011990
Fig. 2, Belt Tensioner on Caterpillar 3126 Engine
Engine
01
Business Class M2 Maintenance Manual, August 2015
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Title of Maintenance Operation (MOP)
MOP Number
Air Cleaner Element Inspection and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 09–01
Air Intake
09
Index, Alphabetical
Business Class M2 Maintenance Manual, November 2014
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09–01 Air Cleaner Element
Inspection and
Replacement
Restriction of air flow through the air cleaner element
is measured at the tap in the air cleaner outlet.
Check the restriction indicator at the air cleaner or in
the cab if the vehicle is equipped with a dash-
mounted restriction gauge.
Vehicles may be equipped with either a manual-reset
restriction indicator with graduations (
), or a
go/no-go restriction indicator without graduations
(
1.
Inspect the air restriction indicator to see if air
restriction equals or exceeds the maximum al-
lowable restriction. For instructions, see the ve-
hicle Driver’s Manual.
NOTICE
Do not use aftermarket air-cleaner elements. After-
market air-cleaner elements may not seal the
housing correctly, which can lead to engine dam-
age and potentially the loss of warranty. When re-
placing an air-cleaner element, use only the part
listed in PartsPro for the serial number of the ve-
hicle.
2.
If necessary, replace the air cleaner element. For
air cleaner element replacement instructions, see
Group 09 of the vehicle Workshop Manual.
3.
Inspect the air cleaner housing for cracks, leaks,
or any other damage. If the air cleaner housing
or element is damaged, replace it.
4.
Reset the air restriction indicator.
5.
Each time the air cleaner housing is replaced,
perform the procedures in MOP 13–01.
08/07/2007
f090452
Fig. 1, Manual-Reset Air Restriction Indicator,
Graduated
04/08/2005
f090431
Fig. 2, Manual-Reset Air Restriction Indicator, Go/
No-Go
Air Intake
09
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