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Cogged belts

Discussion in '80-Series Tech' started by Docmallory, Mar 13, 2004.

  1. Docmallory

    Docmallory Guest

    I bought my 80 a couple of weeks ago. It was making a horrible undulating/oscillating whine from the front of the engine, sounding a like a bearing heading south. The noise was so loud, it could be heard probably 50 yards away. :mad:

    I used my mechanics stethescope to try and find the bad bearing, but could not find a culprit. Fearing this would probably necessitate a trip to a professional mechanic and cost me a bundle, I set out to educate myself as much as I could here on IH8MUD first.

    All the search engine gave me about whining noises was a mention of the Gates cogged belts being noisy. What the heck, I figured, I'll replace the belts first and see if that helps.

    I just got done with that job, and the truck sounds quiet and smooth now. The Toyota belts did the trick.


    Now I can spend the money I had set aside to fix the noise on a new exhaust (because now the danged whistle is the most prominent sound from my truck). :D
     
  2. Pitbull

    Pitbull

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    I know what you mean I had the same thing happen. Sure is quiet now.
     
  3. Outback

    Outback

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    Ditto. Broke one cogged belt and just replaced them all with OEM Toyota.
     
  4. warpdriv

    warpdriv

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    I just tell people it's the supercharger... :D

    But your right, they are evil...
     
  5. RavenTai

    RavenTai

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    just replaced mine and I am shocked how much of what I thought was normal engine noise was those Cogged belts. Besides a ticking noise the 80's engine is now almost silent, now I think I can hear a faint exhaust leak

    on a side note the AC tensioner bearing in mine had a good bit of free play and makes a fair amount of noise, going to replace it soon
     
  6. Rookie2

    Rookie2

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    Is a belt tensioner gage thing-a-ma-deal needed to change out the belts?

    Rookie2
     
  7. semlin

    semlin discouraged user

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    same thing for me. I was all ready to replace an idler pully until proper belts cured it completely. Weird thing was oem belts were cheaper than gates.
     
  8. moralien

    moralien

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    [quote author=Rookie2 link=board=2;threadid=13097;start=msg129182#msg129182 date=1080617747]
    Is a belt tensioner gage thing-a-ma-deal needed to change out the belts?

    Rookie2
    [/quote]

    Only if your really anal. Best bet is to install em, then drive it for a while then check to see if you need to take any slack out.
     
  9. RavenTai

    RavenTai

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    now that I have a pull gage I looked through the FSM looking for a spec (X deflection at Y pounds across N span), I could not find one so I went by feel, is there a spec?
     
  10. sjcruiser

    sjcruiser

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    Raven,

    IIRC, new belts are tensioned to 120lbs; whereas old ones are reinstalled @ 85lbs

    Frank.
     
  11. firetruck41

    firetruck41

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    [quote author=sjcruiser link=board=2;threadid=13097;start=msg129601#msg129601 date=1080677706]
    IIRC, new belts are 120 (units); whereas old ones reinstalled @ 85

    Frank.
    [/quote]
    1 matched pair of fan belts is: PN 90916-02353-83 $12.99 at the local stealer
    A/C belt is PN 99332-10910-83 $10.42 at the local stealer
    Above is for 93 FZJ 80.

    EDIT: sjcruiser, it all makes sense now ;)
     
  12. RavenTai

    RavenTai

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    [quote author=sjcruiser link=board=2;threadid=13097;start=msg129601#msg129601 date=1080677706]
    Raven,

    IIRC, new belts are tensioned to 120lbs; whereas old ones are reinstalled @ 85lbs

    Frank.
    [/quote]


    I assume you mean pulling force along the length of the belt? any Idea how to measure that with a pull gage? my Nissan gave a spec for at a certain point (middle of the longest span IIRC) pushing/pulling perpendicular to the belt a set # of pounds and check that it deflects a certain amount

    I guess I can get a better feel setting with those numbers by hand but not sure how to actually measure that, is there a belt tension gage tool that reads like that?

    my newly installed belts do not slip and don't flop around so I guess I am over analyzing