What does the tension pulley do?
A drive belt tensioner is a pulley mounted on a spring system or adjustable pivot point that is utilized to keep tension on the engine belts. … Both are being used to keeptension on the engine serpentine belts to ensure that they can travel the various engine accessories.
How do you adapt a tensioner pulley?
Flip the adjustment bolt on the side, top or bottom of the pulley counterclockwise with the ratchet and socket before accessory 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 you know
A tensioner pulley manuals the belt around the tensioner and allows the belt to spin as the tensioner maintains pressure against it. A failing tensioner pulley can cause power loss and harm to your belt-driven devices. You could have a failing tensioner pulley in the event that you hear any squeaking or squealing under the hood. Bearings on the pulley can wear out, causing noise and heat. Pulleys are usually made of either plastic or steel, so check the pulley itself for any damage as well. At O’Reilly Vehicle Parts, we’ve tensioner pulleys available for many vehicle models.
The programmed 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, so that the other item pulleys rotate at the same rpm (revolutions per minute) while beneath the same secure pressure. Tensioner pulleys can also absorb moderate shock loads that happen when the air conditioner cuts on / off. As a regularly rotating aspect, the pulley tensioner can give off some warning signs before failure.
Rust and Corrosion
The pulley tensioner sits subjected to the elements at the front end of the engine. Put through puddled water “splash-up,” as time passes the tensioner arm and pulley device can rust. Corrosion can freeze the automated tensioner device or corrode the shaft bearings, that may cause a frozen position in the adjustment pressure. Without the proper pressure, the belt can slide.
Rocks, gravel and other highway debris could be thrown up in to the tensioner pulley grooves and jam the mechanism. This can allow the serpentine belt to slip on the tensioner pulley and shed. Overheated pulley temperatures results, and finally the serpentine belt will melt and snap off.
Pulley Tensioner Spring
The pulley tensioner spring inside the housing may become weak from age and repeated contact with heat. This triggers the belt to flutter and skip rather than maintaining a constant strain on the pulley. Symptoms of a fragile spring display as glazing on the underside of the serpentine belt, with an intermittent flickering of the dashboard’s charging light indicator. Squealing or squeaking will become been told at the belt location.
If the tensioner pulley wobbles on its shaft, this means the interior shaft bearings have worn. This may cause a pulley misalignment. Bad bearings trigger an audible growling noises. The external ends of the serpentine belt will fray and stretch the belt. Gradually the rubber belt grooves flatten out and trigger major slippage. An excessively wobbling pulley can throw the belt off, causing all the add-ons to quit functioning.
Lever Arm Freeplay
Some tensioner pulleys possess markings on the casing that indicate the maximum range that the pulley can travel. If the lever arm of the tensioner rides under or over the designated mark, this implies a stretched belt or a lever arm which has jammed in one position.
The tensioner pulley face must match up to the other accessory pulleys with a parallel alignment. Placing an extended, straightedge ruler against the facial skin of the tensioner pulley, and then flushing it against another item pulley, can gauge the angle. Any off-position measurement indicates donned shaft bearings in the pulley casing.
Serpentine Belt Noise
A moderately donned serpentine belt produces a constant squeaking sound during engine idle. Belts which may have worn severely job a loud chirping or squealing sound. The cause things to a glazed, donned or cracked belt. Dry or partially frozen tensioner pulley bearings could cause such sounds by deteriorating the belt prematurely.
Lever Arm Oscillation
A lever arm that repeatedly oscillates back and forth 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 can manifest itself with intermittent chirping noises.