ACtion Magazine - June 2015 - (Page 31)
Spray bottle test
By Steve Schaeber, MACS Technical Editor
Accessory Belt Drive System (ABDS). Knowing what particular type of noise it is can help
pinpoint the cause.
A chirping noise usually indicates misalignment between pulleys and idlers. Possibilities
can be item wear, pulley damage or improper
component mounting.
If a belt is squealing however, it's usually due to a loss of tension in the system,
MACS
R
eplacing the accessory drive belt is one
of those things that usually falls under
the periodic maintenance category, and
is something that technicians learn how to do
when they first start working on vehicles. These
belts are also commonly replaced due to noise
issues, which are often difficult to diagnose.
This noise is something we've all heard before; that squeak-y, squeak-y, squeak-y sound
coming from the drive belt while the engine is
running. Sometimes it may go away after driving for a few minutes, but sometimes it will not
stop, eventually annoying the driver enough to
do something about it. All too often, technicians
will replace the belt, thinking it's worn out and
no longer able to grip against the pulleys. This
may temporarily solve the problem, but it's
likely to return if the root cause is not addressed.
Belt noises are not usually caused by problems with the belt itself, but rather are attributable to either alignment or tension issues in the
Belt noises are not usually caused by
problems with the belt itself...
caused by a worn out belt, a failing tensioner,
or both. To return the system to "like new"
condition, both the belt and tensioner must be
replaced together. ❆
Check out the GatesAutoTraining channel
on YouTube for a video called Gates Spray
Bottle Test. It's a neat, simple way to help pinpoint the cause of belt noise. More detail is in
the video, but here's basically how it works:
* If spraying the belt with water makes
the noise get louder, it's usually due to
a tension problem indicating both the
belt and tensioner should be replaced.
* If the noise goes away temporarily
and then comes back, this indicates one
or more pulleys are misaligned.
Note: While you're on YouTube, be sure
to check out the MACSWorldwide channel.
Send an e-mail to steve@macsw.org and let
me know which video is your favorite!
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June 2015 * ACTION
31
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Table of Contents for the Digital Edition of ACtion Magazine - June 2015
The Heat is On
A/C Diagnostics and Troubleshooting
Outlook
Service Port
Leonard's Law
Virtual View
Heavy Duty and Off Road
Last Watch
Member Profile
Cooling Corner
Industry News
Association News
New Products and Services
ACtion Magazine - June 2015
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