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Old 03-28-2011, 10:20 AM
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yj screaming altenator belt

My 1987 YJ 4.2 has a habbit of the Aternator belt screaming
have changed the belt three times now (now have a USA supplied belt) but
still screames over 35mph.

Do I need a new alternator ? some one mentioned pullys but I belive that
is attched to the shaft running through the alternator. Does any one else suffer from or has sufferd from the screaming belts ?

Also a vacume problem, can not fined any split hoses but on de-acceleration
at times she cuts out. Have new distrib cap fitted and about to fit new plug lead's..... any ideas ?

Otherwise my Jeep is great, trying to locate new oil breather grommets
as the current ones keep coming out any ideas where I can get some
no one seems to be able here in the UK to help ???????


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Old 03-28-2011, 12:06 PM   #2
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Now the only thing I'm really able to comment on is your belt screaming. When alternators start going out they can start to become more difficult for your belt to turn. So essentially your alternator may be on its way out.... As far as vacuum lines I am fighting those darn things also! Good luck hoped I helped a little bit.

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Old 03-28-2011, 12:38 PM   #3
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mine was screaming just before it died AND every time I decelerated the engine would try to cut out. Once I replaced my alternator both problems went away. It seems the alternator with it's bad bearing was loading down the engine so much it would try to stop it.
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Old 03-28-2011, 07:14 PM   #4
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Bad Memories... just a thought, but i had similar "screams" from my 93. After numerous belts, i tried the process of elimination (by cost, least to most expensive). Bypass the air conditioning pump, 2 new idler pulleys, bypass the pulleys, new water pump, new alternator. Every thing i did stopped the squeal for a day or two but it kept coming back. In the power steering pump was next when i came across an article in one of the forums for the "Harmonic Balancer". Well that was it! A lot of trial and error but most everything I have put in is new and I shouldn't have to worry about much under the hood. Good luck!
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Old 03-28-2011, 07:58 PM   #5
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It sounds to me like a bad alternator might be the culprit here, but you could also try something as simple as tightening the belt. I have seen belts that would scream just because they were too loose.
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