Tension pulley

What does the tension pulley do?
A drive belt tensioner is a pulley mounted on a spring device or adjustable pivot point that is utilized to keep tension on the engine belts. … Both are used to keeptension on the engine serpentine belts to ensure that they can travel the various engine accessories.

How do you modify a tensioner pulley?
Transform the adjustment bolt privately, top or bottom level of the pulley counterclockwise with the ratchet and socket before equipment belt is loose enough to remove. Tighten the tensioner pulley by turning the adjustment bolt clockwise with the ratchet and socket before belt is tight.
How do I know

A tensioner pulley courses the belt around the tensioner and allows the belt to spin while the tensioner maintains pressure against it. A failing tensioner pulley could cause power loss and damage to your belt-driven systems. You could have a failing tensioner pulley in the event that you hear any squeaking or squealing beneath the hood. Bearings on the pulley can degrade, causing noise and high temperature. Pulleys are usually manufactured from either plastic or steel, so verify the pulley itself for any damage aswell. At O’Reilly Vehicle Parts, we’ve tensioner pulleys designed for many vehicle models.

The automated pulley tensioner has an internal spring-loaded mechanism that keeps the serpentine belt under frequent tension. Its design permits it to keep carefully the serpentine belt taut, to ensure that the other accessory pulleys rotate at the same rpm (revolutions per minute) while beneath the same secure pressure. Tensioner pulleys can also absorb slight shock loads that happen when the air conditioning unit cuts on / off. As a continuously rotating element, the pulley tensioner can provide off some indicators before failure.

Rust and Corrosion
The pulley tensioner sits exposed to the elements at the front of the engine. Put through puddled water “splash-up,” with time the tensioner arm and pulley system can rust. Rust can freeze the computerized tensioner device or corrode the shaft bearings, which will cause a frozen job in the adjustment pressure. Without the correct pressure, the belt can slide.
Debris Contamination
Rocks, gravel and other street debris can be thrown up in to the tensioner pulley grooves and jam the device. This can permit the serpentine belt to slide on the tensioner pulley and burn off. Overheated pulley heat results, and finally the serpentine belt will melt and snap off.
Pulley Tensioner Spring
The pulley tensioner spring inside the housing can become weak from age and repeated contact with heat. This causes the belt to flutter and skip rather than maintaining a constant pressure on the pulley. Symptoms of a poor spring present as glazing on the lower of the serpentine belt, with an intermittent flickering of the dashboard’s charging mild indicator. Squealing or squeaking will always be been told at the belt location.
Pulley Wobble
If the tensioner pulley wobbles on its shaft, this means the interior shaft bearings have worn. This will cause a pulley misalignment. Bad bearings cause an audible growling sound. The external ends of the serpentine belt will fray and stretch the belt. Eventually the rubber belt grooves flatten out and trigger main slippage. An excessively wobbling pulley can toss the belt off, causing all the extras to quit functioning.
Lever Arm Freeplay
Some tensioner pulleys possess markings on the housing that indicate the maximum range that the pulley can travel. If the lever arm of the tensioner rides under or higher the designated mark, this implies a stretched belt or a lever arm which has jammed in a single position.
Pulley Misaligment
The tensioner pulley face must match to the other accessory pulleys with a parallel alignment. Placing an extended, straightedge ruler against the face of the tensioner pulley, and flushing it against another accessory pulley, can measure the angle. Any off-angle measurement indicates donned shaft bearings in the pulley casing.
Serpentine Belt Noise
A moderately donned serpentine belt produces a constant squeaking noise during engine idle. Belts which may have worn severely project a loud chirping or squealing sound. The cause tips to a glazed, donned or cracked belt. Dry or partially frozen tensioner pulley bearings could cause such sounds by wearing out the belt prematurely.
Lever Arm Oscillation
A lever arm that repeatedly oscillates back and forth during idle or more speeds means the the within damper mechanism in the tensioner pulley has weakened or broken. This triggers sporadic tension pressure on the belt and can manifest itself with intermittent chirping noises.


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