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05-19-2015, 01:25 PM
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#1 |
 Drives: 2007 Yaris LB Join Date: Aug 2009
Location: Bolivar
Posts: 13
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Serpentine Belt Replacement - Is it possible to get it too tight?
I'm about to replace the serpentine belt on my 2007 Yaris. From reading around on here, I see that if it squeals, it's too loose. However, would a belt that's too tight put bad pressure on the pulleys?
Since nobody seems to be mentioning a too-tight belt, I'm thinking that it's probably difficult to get it too tight. Thoughts?
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Keith, 2007 Yaris Liftback YouTube: Keith's Test Garage | http://www.KeithsTestGarage.com |
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05-19-2015, 01:28 PM
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#2 |
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2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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Yes. Over-tightening the belt can/will cause premature failure of one or more bearings, usually the water pump or alternator. Welcome to the World!
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05-19-2015, 02:34 PM
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#3 |
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Drives: 2007 Toyota Yaris LB Join Date: Mar 2007
Location: Bay Area, CA
Posts: 76
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The rule of thumb with serpentine belts is to try to twist the belt 90 degrees in the middle of the longest span - it should twist 90 degrees but no more.
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05-19-2015, 03:18 PM
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#4 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,792
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Yes thats what Ive heard the 90 degree twist thing.
Which makes no sense to me because no matter how tight the belt is you can twist it 90 degrees! I guess what I would do is tighten it so it squeeks. Then a little more. More. More. Until it stops. Then back it off a hair. What could it hurt if it squeeks? 
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Synthetic Oil: Its All In Your Head |
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05-19-2015, 03:47 PM
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#5 |
 
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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I tighten it so that it is very firm when pushed down in the middle of the longest span. I allow it to move a cm or so either way w/ quite a bit of force pushing on it.
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05-25-2015, 05:52 AM
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#6 |
Drives: 2007 Yaris Join Date: Sep 2011
Location: Canada
Posts: 22
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You can make it good and tight without damaging bearings. When it spins, the belt is looser than when it's standing still.
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