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Old 04-07-2018, 05:58 PM   #1
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Default New belts squealing

New alternator and fan belts are squealing on startup, and upon slowing down / taking off (manual transmission) cant figure it out. ideas?
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Old 04-08-2018, 12:08 AM   #2
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typical 4 cyl problem. get some fine grit sand paper and slightly rought the pulley grooves. running a gates or goodyear gatorback belt will also help with that belt screaming.
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Old 04-08-2018, 11:36 AM   #3
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Try charging the battery -- if dead, maybe the alternator is working too hard. Also, of course, set the tension properly; I use the deflection method.

Could also be: bad/cheap belt (I too use Gates when possible), bad alternator (or other driven device), poor pulley-alignment.
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Old 04-08-2018, 01:27 PM   #4
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I use only Gates or Gatorback belts; on my '98 4-cylinder had squealing last year due to alternator belt. Some claim the Nissan belts are OK.

And belts need to be tight; once squealing, they can gall up and grab less.

Amazingly, squealing belts is quite common on these engines.
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Old 04-08-2018, 02:00 PM   #5
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I noticed on my 89 the stock size belts simply were too large, was right at the end of adjustment. They would start squealing within a week of installing them. dropped a inch off each belt and been running that set for a year with no noise.
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Old 04-08-2018, 07:48 PM   #6
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i have noticed that some belts sit lower in the pulley channel. those are usually the cheaper brand belts. less material, less price.
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Old 04-08-2018, 09:47 PM   #7
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Quote:
Originally Posted by cadillacdude1975 View Post
i have noticed that some belts sit lower in the pulley channel. those are usually the cheaper brand belts. less material, less price.
used the best they had, Gator backs..... still too long with stock mesure. Think the pulleys must change.I just had to make em shorter to get the tension.
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Old 04-08-2018, 09:56 PM   #8
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And another thing ...

I've had to replace my idler pulleys (two, because of A/C option) -- their bearings failed. One was making quite a screeching noise.
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Old 04-10-2018, 02:52 PM   #9
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Quote:
Originally Posted by johnber View Post
I noticed on my 89 the stock size belts simply were too large, was right at the end of adjustment. They would start squealing within a week of installing them. dropped a inch off each belt and been running that set for a year with no noise.
On my 1998 4-cylinder, I also dropped down a size (like 1/2 or 1 inch) on my alternator belt a few months ago, when I changed the belt/replaced the adjusting bolt because of a squealing issue. The stock-size alternator belt on mine was also near the end of the adjustment threads.

For the record, I use Gates/CarQuest 7350 alternator belt and Gates/CarQuest 9360 AC belt. My PS belt is Gates/CarQuest 9495 or Goodyear Gatorback 17494.
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Old 04-13-2018, 12:00 PM   #10
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both Gates belts as far as i recall. I've belt dressed and adjusted the damn tensioners up and down and nothing has worked. it seems mainly still on startup, and gearing down when the squealing happens. i still cant pinpoint which pulley it is either
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