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| Serpentine Belt Tensioner http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=81712 |
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| Author: | Greasey Bob [ Mon Mar 30, 2015 8:08 pm ] |
| Post subject: | Serpentine Belt Tensioner |
My Serpentine Belt Tensioner shakes real bad and squeals at idle. So where do I get a new one Id Parts is $159. That sounds like a lot. Is that the best one going. I just turned 195k miles, and looking at a lot of maintenance--timing belt kit($399) thermostat ($159-$450) rear diff fluid, Coolant, trans fluid ($100 at least) intercooler hoses, Is this really going to be worth it? And I still have to put it all in. I am glad I just made my last payment. Robert |
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| Author: | papaindigo [ Mon Mar 30, 2015 9:10 pm ] |
| Post subject: | Re: Serpentine Belt Tensioner |
Shaking is usually caused by a bad alternator decoupler pulley. If it's squealing because of a bad idler pulley be advised that the tensioner idler pulley can be replaced as it's identical to the 2 serpentine belt idler pulleys in size. |
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| Author: | racertracer [ Tue Mar 31, 2015 1:37 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
Replace the alternator decoupler pulley first. It is the cause of the tensioner jumping around. There's a special tool to accomplish this. Many of us have opted to replace the alternator which comes with the decoupler pulley already attached, instead of replacing the alternator decoupler pulley. It's easier and cheaper to do than to replace the decoupler pulley attached to the alternator. http://www.autozone.com/batteries-start ... ing=search Alternator Part Number: 15457 You probably wont believe me, but if you instead replace the tensioner. the problem will not go away. |
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| Author: | DOC4444 [ Tue Mar 31, 2015 6:36 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
If you have over 100K and you have been running for a while with the problem you posted about, I would order a new tensioner and belt because you will need them fairly soon, even if you take care of the real problem that is causing you belt to jump (almost always decoupler, as you have been told). Just make sure you do NOT get a Crown brand tensioner. DOC |
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| Author: | Greasey Bob [ Thu Apr 02, 2015 7:39 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
I changed the alternator with a new lifetime warranty one 16 months ago and then again last month. I have 196k miles. A month ago the tensioner looked like it might not be working right after loosing two decouplers. Are you saying I can order an idle pulley and put it on the alternator to replace the clutched version it is just hard to do. What if I take a new idler pulley and the alternator to the alternator repair shop and have them just change the pulley for me and I will put it back in. At the same time I will change the tensioner. I should just do the timing belt at the same time also. Even if it is 3-4k miles early. |
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| Author: | papaindigo [ Thu Apr 02, 2015 8:27 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
My bad re. typo, now fixed, in my original response. Tensioner shaking is usually caused by a bad alternator decoupler pulley and can be fixed by a new alternator decoupler pulley or a new alternator. However long term shaking can damage the tensioner housing and/or spring in which case the tensioner needs to be replaced. Tensioner squealing is likely a bad tensioner idler pulley bearing in which case the pulley can be replaced. The tensioner idler pulley is the same size as the 2 serpentine idler pulleys so replacement is easy. No you cannot replace the alternator decoupler pulley with an idler pulley. |
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| Author: | dirtmover [ Thu Apr 02, 2015 9:01 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
Greasey Bob wrote: Are you saying I can order an idle pulley and put it on the alternator to replace the clutched version it is just hard to do. What if I take a new idler pulley and the alternator to the alternator repair shop and have them just change the pulley for me and I will put it back in. If you take your alternator to a repair shop they will install the correct decoupler. It's a 5 min job with the correct tools. The decoupler is specific to the application, you can't just use any. |
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| Author: | thermorex [ Thu Apr 02, 2015 12:49 pm ] |
| Post subject: | Re: Serpentine Belt Tensioner |
Or you can buy this, if you prefer doing it yourself -68009879AB alternator decoupler pulley Litens updated (PN 920834 available from Advanced Auto at $78) that is internally greased. |
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| Author: | Greasey Bob [ Sat Apr 04, 2015 7:57 am ] |
| Post subject: | Re: Serpentine Belt Tensioner |
I ordered parts for my 200k mile tune up. I ordered a new belt tensioner, Timing Belt kit, fuel filter, arp head bolts, transmission filter and fluid...plus other stuff. Total bill was $1400 in parts, I had to get a loan--next up I am going to have to put them in the car. |
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