What does the strain pulley do?
A travel belt tensioner is a pulley mounted on a spring mechanism 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 so that they can drive the various engine accessories.
How do you change a tensioner pulley?
Flip the adjustment bolt on the side, top or bottom of the pulley counterclockwise with the ratchet and socket until the item belt is loose enough to remove. Tighten the tensioner pulley by turning the adjustment bolt clockwise with the ratchet and socket until the 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 can cause power loss and damage to your belt-driven devices. You could have a failing tensioner pulley if 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 check the pulley itself for just about any damage aswell. At O’Reilly Automotive Parts, we’ve tensioner pulleys designed for many vehicle models.
The computerized pulley tensioner has an internal spring-loaded mechanism that keeps the serpentine belt under regular tension. Its design enables it to keep the serpentine belt taut, in order that the other equipment 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 element, 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. Put through puddled water “splash-up,” as time passes the tensioner arm and pulley system can rust. Corrosion can freeze the automatic tensioner device or rot the shaft bearings, that will cause a frozen posture in the adjustment pressure. Without the proper tension, the belt can slide.
Rocks, gravel and other highway debris can be thrown up into the tensioner pulley grooves and jam the mechanism. This can allow the serpentine belt to slide on the tensioner pulley and burn. Overheated pulley temp results, and eventually the serpentine belt will melt and snap off.
Pulley Tensioner Spring
The pulley tensioner spring within the housing may 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 display as glazing on the lower of the serpentine belt, with an occasional flickering of the dashboard’s charging light indicator. Squealing or squeaking will be noticed at the belt location.
If the tensioner pulley wobbles on its shaft, it means the inside 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. Ultimately the rubber belt grooves flatten out and cause significant slippage. An excessively wobbling pulley can toss the belt off, creating all the components 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 over the designated mark, it indicates a stretched belt or a lever arm that 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 measure the angle. Any off-angle measurement indicates put on shaft bearings in the pulley housing.
Serpentine Belt Noise
A moderately donned serpentine belt gives off a constant squeaking sound during engine idle. Belts that have worn severely project a loud chirping or squealing sound. The cause details to a glazed, worn or cracked belt. Dried out or partially frozen tensioner pulley bearings can cause such sounds by deteriorating 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 can manifest itself with intermittent chirping sounds.