Failure the the Chevrolet V8 belt tensioner continues to be a common problem. Although you can find a negative tensioner on nearly any Chevrolet V8 design this page highlights concerns on the 4.8L 5.3L and 6.0L V-8 engines. You can find these power plants in countless GMC, Cadillac and also Chevrolet trucks from the 2000 version year v the 2006 model year. The originally installed GM component number 12609719 fails in high numbers.

Note that replacement parts easily accessible from AC Delco can carry an updated component number. With that said, that is quite possible to have actually symptoms of a belt tensioner worry that turns out to it is in something fully different.

And this is why we built this page. Not only will us cover exactly how to diagnose and replace a defective Chevrolet V8 belt tensioner we"ll talk around how to verify that this is the actual problem.

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The typical symptoms of belt squeal, groaning noise, grinding and also squeaking can come from other failed contents driven by the very same serpentine journey belt. If we take our time and apply some logic and also positively recognize the root reason of the issue.

I have a lot of experience in ~ diagnosing engine belt noise. I"m not blowing my own horn here. What I"m trying to say is in spite of my 30 year of hands-on diagnosis and repair that this system, ns still should verify the fail component before I order new parts. I don"t want to take it the van apart, change the serpentine tensioner, just to discover out the something else is do noise once I fire it up again. Allow us help you native making this mistake. Together a bonus, we"ll it is provided the serpentine belt routing diagram more down the web page in instance yours fell off of the upper fan shroud. Make sure you stick with us until you acquire to the finest practices ar at the bottom. This contains a few things I"ve learned from making these repairs myself.

Diagnosing negative Belt Tensioners

Squealing or squeaking continues to be two of the most usual symptoms that a defective serpentine belt tensioner. As far as what go wrong v the part, over there can also be a pair of various failures in ~ this one component. The wheel attached to the feather arm has a bearing top top it.This bearing can fail and cause a squeaking sound that would drive friend crazy. The noise that the bearing renders often alters with the engine RPM, but not always. The other concern that this parts have actually is a weakening that the tension spring. This permits slack in the belt and also the noise you in reality hear is brought about by slipping end the accessory pulleys.Finally, an additional issue the I"ve seen quite often with this particular GM component number 12609719 is separation the the base and arm assembly. You can see this condition when you revolve the tensioner in the counterclockwise direction. Together you take the load off the the serpentine journey belt you have the right to see movement in between the base that attaches to the engine and the spring arm that uses tension to the belt.

Diagnosing Idler pulley-block Problems


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Belt chart 4.8L 5.3L and 6.0L Engines

Excessive motion in this area shows a failed Chevrolet V8 belt tensioner. The idler pulley falls short in far fewer numbers 보다 the tensioner.

This is since the idler pulley doesn"t move around and becomes subjected to less vibration and wear. However, this component might likewise need replacing at the exact same time that the belt tensioner fails.

You find this scenerio more often top top high purpose of use 4.8L 5.3L and also 6.0L V8 engines. Therefore here"s exactly how you diagnose a poor idler pulley. With the belt removed you can examine for beat in the bearing. There need to be absolutely no finish play or deflection as you wiggle the hub the the pulley.

In addition, you deserve to spin the idler pulley and it should complimentary spin easily. If the doesn"t store going because that a second or two I would go ahead and also replace it.

Also you can grab the wheel hub and rotate it and also verify smooth operation. Any kind of gritty or bumpy emotion as you turn becomes another indication the this component needs replacing.I"ve viewed a most owners complain around having come replace components on this engine. Things prefer water pumps, alternators and idler pulleys weren"t designed to walk 300,000 miles. Although nobody of us like replacing these components it’s pretty exceptional that you have the right to put this countless miles on this motors.

What Else reasons Serpentine Belt Noise

It"s crucial to keep in mind that any serpentine belt thrust accessory have the right to make noise that sounds an horrible lot choose a defective tensioner or idler pulley. Each of these materials has their very own bearings that can make the same squeaking, squealing, grind or rumbling noises.Let"s use the automobile air conditioning mechanism compressor as an example. Return this component can create noise at various speeds the sound often worsens as soon as the compressor is engaged. When the AC compressor is the cause of belt noise the sound always changes when the compressor cycles on and off.When an alternator bearing fails, it may not show any type of signs of automotive electrical system problems. To properly diagnose a failed alternator bearing you eliminate the belt and also rotate the wheel on the alternator by hand. Just like when diagnosing the idler sheave there must be no beat or noise.

It should additionally rotate smoothly through no roughness felt. Finally, an old serpentine drive belt or one of poor quality can additionally generate squealing and also squeaking sounds. You have the right to condemn the rubber belt by eliminating all of the various other possibilities.

However, there is another method you deserve to use that gives a strong indication the the belt demands replacing. You can take a high-volume spray party containing clean insanity water and also wet the belt down.

If the noise disappears totally it could be an indication the a new belt will deal with the problem. Through that said, using a belt dressing or any type of oil based product is not recommended. These spray lubricants actually start to eat away at the rubber quickly.

Replacing the Chevrolet V8 Belt Tensioner


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Chevy V8 Belt Tensioner and Idler Pulley

To gain access to the component you must remove the waiting intake runner assembly. Through this plastic point swung the end of the means you"ll have actually plenty the room to compress the tensioner feather by rotating it in the clockwise direction.

Sidebar: return the center bolt is only a 15 mm in size it takes rather a little of pressure to revolve the tensioner. You"ll most likely need something longer than a typical wrench. I use a serpentine belt tool, yet you can additionally use a long handle breaker bar or extra long handle ratchet.

One the the noticeable tips once you go to replace the Chevrolet V8 belt tensioner is to remember wherein the short bolt goes. 2 of the bolts go through the tensioner assembly and also the water pump. The remaining quick bolt threads into the engine bracket assembly.

The two longer bolts install in the upper holes and the short bolt threads right into the lowest position. Here"s the important point to make.

For part reason world like to crush these bolts when tightening castle down. The main torque specification noted in the general Motors repair manual comes in in ~ 37 foot-pounds.

I highly recommend using a torque wrench come tighten this bolts. End tightening and also stripping the retaining bolts stay two the the most usual problems linked with DIY maintenance replacement of the Chevrolet V8 belt tensioner.

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Final Thoughts around Servicing the Belt Tensioner


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Chevrolet Belt anxiety Assembly

My long-standing customers recognize that I"m no the sort of mechanic the likes to up market a simple small repair into a large expensive job. However, once you"re in there replacing the tensioner you might consider replacing the idler pulley and getting yourself a new high high quality replacement serpentine belt in ~ the very same time.My next recommendation goes out to human being who consider this car their forever truck. When some the my customers buy a Chevrolet van they arrangement to keep it in the family members for a lengthy time. They might hand it down to a young driver or save it roughly as a job-related truck. For this reason you might think about replacing the water pump at the exact same time.The original equipment water pumps on this trucks critical for about 10 year or 150,000 miles. The course, her results can vary. V that said, if you have actually a 2006 Chevrolet Silverado with the 4.8L 5.3L or 6.0L engine, your automobile is currently past these milestones. This way your water pump is running on borrowed time.

My last thought around the Chevrolet V-8 belt tensioner points ago to an alternative diagnostic method. Expert technicians own a noise finding machine known as the mechanics stethoscope.

This can make quick work that diagnosing every kinds that engine noises. In the situation of a failure accessory pulley bearing the mechanics stethoscope becomes a an useful special tool. As soon as you ar the guideline of the probe ~ above a healthy and balanced bearing it sound delightful and also smooth.

However, as soon as you location the probe versus a bearing in the procedure of failing it makes a racket. The tool can prevent girlfriend from misdiagnosing these difficult to decipher serpentine belt noises. Us filed this post in the various automotive difficulties section. If girlfriend own among these Chevy trucks, you should learn around the common Vortec V8 coolant leak native the entry manifold.