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How Does it Work /
Serpentine Belt
Serpentine Belt
The drive belt or multi ribbed belt is an essential component of your vehicle.
The primary belt function is to supply power to the steering system, water pump,
air pump (if equipped) air conditioner and alternator. The belt is connected to
the drive pulley of the engine to supply power. If the belt fails it will almost
always render your vehicle inoperable until the drive belt is replaced. Typically
most people are able to replace a serpentine belt themselves with basic automotive
repair knowledge. When replacing the belt draw a diagram of the belt routing before
you start to avoid confusion. If you have removed the drive belt and need the
belt routing you can look it up on a
belt routing diagram.
Typical Multi Rib Belt
There are two different types of belts primarily; the first is a serpentine
belt which tends to cross the motor several times to operate additional
components. There are several names that are used to describe a serpentine belt,
including Poly-V, Multi-Rib, and even a Micro-V Belt. However, all of these
terms mean the exact same thing and do not change the way the belt is routed, or the type of material the
belt is constructed from. A serpentine belt tends to have several V's in the belt
that act as better grip for the drive pulley and components of the drive belt system.
Multi Ribbed Belt (cross view)
Problems you can have with a drive belt are that on occasion it can slip off the
pulleys or break. When a drive belt slips off the pulley system it usually is because
the belt tensioner has worn allowing the belt to become misaligned. To correct this
problem the belt tensioner must be replaced. Also inspect the drive belt and replace
if needed, it can be damaged when it derails.
Drive Belt Tensioner
The tensioner automatically holds the proper tension on the drive belt so there
is no need for re-tightening. If the drive belt is loose the tenioner has failed
or the wrong size belt is installed. The tensioner should be about half way between
its throw to hold proper tension on the belt. On rare occasions an engine can buck
or jerk at start up and can suddenly cause a belt to slip out of place. Other problems
can occur if the belt itself snaps this can be due to fatigue of the belt. The most
common reason for the belt to snap is the age coupled with the natural wear and
tear of the belt.
Cracked Multi Rib Belt
Another problem that can occur is the belt can start to fray. While this will
not actually cause the drive belt system to stop working it will cause problems
as it comes further apart down the road. Remove and replace the belt if this condition
is observed.
Maintenance
For regular maintenance lift the hood and do a complete visual inspection of
the belt. Be sure there is no fraying, cracking or any chunks missing. If it appears
that any of these conditions exist replace the belt with a new unit. Replacing the
belt before it fails is always advisable; it will prevent you from breaking down
on the roadside. The drive belt is generally a component that requires maintenance.
If you notice that you have to continuously change drive belts, you should have
all of your pulleys examined for excess debris lodged inside the pulley groves.
This condition will cause the belt to wear out prematurely.
How Does it Work
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Serpentine Belt
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