Tension pulley

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

How do you modify a tensioner pulley?
Flip the adjustment bolt on the side, top or bottom of the pulley counterclockwise with the ratchet and socket until the accessory belt is loose enough to eliminate. 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 tutorials 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 devices. You might have a failing tensioner pulley in the event that you hear any squeaking or squealing under the hood. Bearings on the pulley can degrade, causing noise and high temperature. Pulleys are usually made of either plastic or steel, so verify the pulley itself for any damage aswell. At O’Reilly Auto Parts, we’ve tensioner pulleys designed for many vehicle models.

The computerized pulley tensioner comes with an internal spring-loaded mechanism that keeps the serpentine belt under constant tension. Its design enables it to keep the serpentine belt taut, in order that the other accessory pulleys rotate at the same rpm (revolutions each and every minute) while beneath the same safe pressure. Tensioner pulleys can also absorb mild shock loads that happen when the air conditioner cuts on / off. As a regularly rotating part, the pulley tensioner can provide off some warning signs before failure.

Rust and Corrosion
The pulley tensioner sits exposed to the elements at the front end of the engine. Subjected to puddled water “splash-up,” as time passes the tensioner arm and pulley mechanism can rust. Corrosion can freeze the programmed tensioner device or rot the shaft bearings, that may cause a frozen position in the adjustment pressure. Without the correct tension, the belt can slide.
Debris Contamination
Rocks, gravel and other highway debris could be thrown up into the tensioner pulley grooves and jam the device. This can permit the serpentine belt to slide on the tensioner pulley and burn. Overheated pulley temperatures results, and finally the serpentine belt will melt and snap off.
Pulley Tensioner Spring
The pulley tensioner spring in the housing can become weak from age and repeated contact with heat. This causes the belt to flutter and skip instead of maintaining a constant strain on the pulley. Symptoms of a poor spring demonstrate as glazing on the underside of the serpentine belt, with an intermittent flickering of the dashboard’s charging light indicator. Squealing or squeaking will always be been told at the belt position.
Pulley Wobble
If the tensioner pulley wobbles on its shaft, this means the inside shaft bearings have worn. This will cause a pulley misalignment. Terrible bearings cause an audible growling sound. The outer ends of the serpentine belt will fray and extend the belt. Sooner or later the rubberized belt grooves flatten out and cause main slippage. An excessively wobbling pulley can throw the belt off, creating all the equipment to quit functioning.
Lever Arm Freeplay
Some tensioner pulleys have markings on the housing that indicate the utmost range that the pulley can travel. If the lever arm of the tensioner rides under or higher the designated mark, it indicates a stretched belt or a lever arm that has jammed in a single position.
Pulley Misaligment
The tensioner pulley face must match up to the other accessory pulleys with a parallel alignment. Placing a long, straightedge ruler against the face of the tensioner pulley, and then flushing it against another equipment pulley, can measure the angle. Any off-position measurement indicates put on shaft bearings in the pulley casing.
Serpentine Belt Noise
A moderately put on serpentine belt produces a constant squeaking noise during engine idle. Belts that have worn severely job a loud chirping or squealing audio. The cause things to a glazed, put on 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 backwards and forwards during idle or more speeds means the the inside damper mechanism in the tensioner pulley has weakened or broken. This causes sporadic tension strain on the belt and will manifest itself with intermittent chirping sounds.

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