03-05-4
Drive Belts, Accessory
03-05-4
DIAGNOSIS AND TESTING
(Continued)
DRIVE BELTS, ACCESSORY (Continued)
Condition
Possible Source
Action
•
Drive Belt Does Not Hold Tension
•
Drive belt cracking or damaged.
•
INSPECT drive belt for cracking
parallel with and through to
backing. REPLACE drive belt if
required.
•
Drive belt tensioners worn or
•
CHECK drive belt tensioner for
damaged.
damage and correct operation.
REPLACE drive belt tensioner if
required.
•
Drive Belt Squeal or Chirp
•
Incorrect drive belt installed.
•
CHECK drive belt for correct part
application.
•
Lubricant or other contamination
•
CHECK drive belt for oil, coolant,
on drive belt.
power steering fluid, brake fluid or
other contamination. REMOVE
drive belt and WASH with
detergent and water. If drive belt
cannot be cleaned or is damaged
(softened) by contamination,
REPLACE drive belt.
•
Drive belt pulleys and devices not
•
CHECK pulleys for proper
aligned properly, damaged or not
alignment, devices and pulleys for
rotating freely.
Component Tests
Drive Belt Tensioner, Automatic
The automatic drive belt tensioner (68209) can be
checked as follows:
1 . With the engine running, observe drive belt
tensioner movement. The drive belt tensioner
should move (respond) when the A
I
C
compressor ( 1 9703) cycles or when the engine is
accelerated rapidly. If the drive belt tensioner
movement is constant and excessive, a pulley or
shaft is probably bent or a pulley is out of round.
In rare cases, excessive drive belt rideout
(uneven depth of grooves in drive belt (8620))
can cause excessive drive belt tensioner
movement. This condition can be checked by
replacing the suspect drive belt with a new drive
belt and repeating the observation.
2. With engine off, check for proper drive belt
routing. Refer to the illustrations under Removal
and Installation. Service as required.
3. Inspect the drive belt tensioner wear indicator as
described under Drive Belt Tensioner, Automatic
in Adjustments, to make sure the drive belt is
within operating range. Replace the drive belt as
required.
4.
Rotate the drive belt tensioner and check for a
binding or frozen condition. Replace components
as required.
proper freedom of rotation and
damage. SERVICE pulleys and
devices as required.
5. With the engine running, check drive belt tracking
(the position of the belt on the drive belt tensioner
pulley). If the edge of the drive belt rides beyond
the edge of the drive belt tensioner pulley, this
can cause noise and premature wear.
If
a drive
belt tracking condition exists, proceed with the
following:
•
Check the drive belt tensioner for damage,
especially the mounting pad surface.
If
the
drive belt tensioner is not installed correctly
with the locating pins in the locating holes, the
mounting surface pad will be out of position.
This will result in drive belt mistracking,
improper drive belt tension and chirp and
squeal noises.
•
lighten the drive belt tensioner-to-bracket
retaining bolt to specification. Recheck drive
belt tracking.
•
Use a straightedge or similar tool to check the
drive belt tensioner pulley for crown.
•
Pulley crown acts to center the drive belt.
If
there is
no crown, replace drive belt tensioner. Recheck
drive belt tracking.
•
Check all accessories, mounting brackets and drive
belt tensioner for any interference that would
prevent the component from mounting properly.
Correct any interference condition and recheck
drive belt tracking.
•
lighten all accessory mounting brackets and drive
belt tensioner retaining hardware to specification.
Recheck drive belt tracking.
1997 Thunderbird, Cougar July 1996
Содержание Thunderbird
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