Drive Belt Falls Off And Excessive Wear Diagnosis - Suzuki XL7 2007 Service Manual

1D-40 Engine Mechanical:
Drive Belt Falls Off and Excessive Wear
Diagnosis
Diagnostic Aids
If the drive belt repeatedly falls off the drive belt pulleys,
this is because of pulley misalignment.
An extra load that is quickly applied on released by an
accessory drive component may cause the drive belt to
fall off the pulleys. Verify the accessory drive
components operate properly.
If the drive belt is the incorrect length, the drive belt
tensioner may not keep the proper tension on the drive
belt.
Excessive wear on a drive belt is usually caused by an
incorrect installation or the wrong drive belt for the
application.
Minor misalignment of the drive belt pulleys will not
cause excessive wear, but will probably cause the drive
belt to make a noise or to fall off.
Excessive misalignment of the drive belt pulleys will
cause excessive wear but may also make the drive belt
fall off.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2.
This inspection is to verify the condition of the drive belt.
Damage may of occurred to the drive belt when the drive
belt fell off. The drive belt may of been damaged, which
caused the drive belt to fall off. Inspect the belt for cuts,
tears, sections of ribs missing, or damaged belt plys.
4.
Misalignment of the pulleys may be caused from
improper mounting of the accessory drive component,
incorrect installation of the accessory drive component
pulley, or the pulley bent inward or outward from a
previous repair. Test for a misaligned pulley using a
Step
CAUTION
!
Refer to "Belt Dressing Notice: ".
DEFINITION: The drive belt falls off the pulleys or may not ride correctly on the pulleys.
DEFINITION: Wear at the outside ribs of the drive belt due to an incorrectly installed drive belt.
Did you review the Drive Belt Symptom operation and perform
1
the necessary inspections?
If diagnosing excessive wear, proceed to step 13.
If diagnosing a drive belt that falls off, inspect for a damaged
2
drive belt.
Did you find the condition?
Install a new drive belt. Refer to "Drive Belt Replacement".
3
Does the drive belt continue to fall off?
Inspect for misalignment of the pulleys.
4
Did you find and repair the condition?
Inspect for a bent or dented pulley.
5
Did you find and repair the condition?
Inspect for a bent or a cracked bracket.
6
Did you find and repair the condition?
straight edge in the pulley grooves across two or three
pulleys. If a misaligned pulley is found refer to that
accessory drive component for the proper installation
procedure of that pulley.
5.
Inspecting the pulleys for being bent should include
inspecting for a dent or other damage to the pulleys that
would prevent the drive belt from not seating properly in
all of the pulley grooves or on the smooth surface of a
pulley when the back side of the belt is used to drive the
pulley.
6.
Accessory drive component brackets that are bent or
cracked will let the drive belt fall off.
7.
Inspecting of the fasteners can eliminate the possibility
that a wrong bolt, nut, spacer, or washer was installed.
Missing. loose, or the wrong fasteners may cause pulley
misalignment from the bracket moving under load. Over
tightening of the fasteners may cause misalignment of
the accessory component bracket.
13.
The inspection is to verify the drive belt is correctly
installed on all of the drive belt pulleys. Wear on the drive
belt may be caused by mis-positioning the drive belt by
one groove on a pulley.
14.
The installation of a drive belt that is two wide or two
narrow will cause wear on the drive belt. The drive belt
ribs should match all of the grooves on all of the pulleys.
15.
This inspection is to verify the drive belt is not contacting
any parts of the engine or body while the engine is
operating. There should be sufficient clearance when the
drive belt accessory drive components load varies. The
drive belt should not come in contact with an engine or a
body component when snapping the throttle.
Action Yes
Go to "Symptoms -
Go to Step 2
Engine Mechanical"
Go to Step 3 Go to Step 4
Go to Step 4 System OK
Go to Step 12 Go to Step 5
Go to Step 12 Go to Step 6
Go to Step 12 Go to Step 7
No