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Loose timing belt

Posted by triggerx, Sep 21, 2012

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  1. triggerx

    triggerx Proven Member

    342
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    Joined Aug 15, 2009
    Gilbert, Arizona
    Just did this timing job after a small rebuild on my 1g 90 talon awd, the tension was fine earlier,but seemed to have loosened up quite a bit?

    I just replaced this hydrolic tensioner, so IDK if thats really it. Had it pushed in for awhile though
     
  2. TurboLaserRS

    TurboLaserRS Proven Member

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    Joined May 14, 2011
    Dayton, Ohio
    Did you set the initial tension correctly? What did you have for clearance between the tensioner body and the tensioner arm? Should be somewhere around 4mm if I remember correctly.
     

    1K  0

    1990 Plymouth Laser RS Turbo
    11.128 @ 132.500 · 1G DSM
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  3. PieEyedPiper

    PieEyedPiper DSM Wiseman

    4,317
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    Joined Nov 13, 2004
    North Bay Area, California
    Definitely consider the above, especially since it's a fresh timing job, but also know that over time (hours) some slack will develop between the cam gears.

    Are you running the engine or is it still on jacks?
     

    1K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  4. WES_393

    WES_393 DSM Wiseman

    3,125
    60
    Joined Jun 6, 2011
    Colo Spgs, Colorado
    The belt will lose tension between cam gears while sitting. Turn the engine by hand until the timing marks line up. Then check tension on all sides of the belt. If there is still some slack (more than 1/2" deflection), something isn't right with the tensioner or tension pulley.
     
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  5. triggerx

    triggerx Proven Member

    342
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    Joined Aug 15, 2009
    Gilbert, Arizona
    That could be my problem, I didnt even know I had to set an initial tension, I just replaced the tensioner and thats it. It tightened up, and was good for awhile but seemed to have loosened. Ill check though.
    Its just a PITA pulling off the lower timing cover. Literally takes longer than the the timing itself.

    Its not on Jacks btw, I drove it for a good 20 minutes.
     
  6. pauleyman

    pauleyman DSM Wiseman

    5,188
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    oklahoma city, Oklahoma
    DO NOT DRIVE IT ANYMORE. You must set tension and it must be correct. There is no other way. vfaq.com
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  7. triggerx

    triggerx Proven Member

    342
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    Joined Aug 15, 2009
    Gilbert, Arizona
    Will do, yea ### basically so far I know that there was too much slack between the cam gears. I turned the crank by hand and the slipped seemed to disappear. Well at least from the top.

    See I had no idea I needed to mess with the tensioner. I mean I replaced it but I assumed it all tightened up automatically. And I didn't even loosen the tensioner pulley because I wasn't going to replace it.

    But basically you all are saying that installing a new tensioner requires you to set it as well?
     
  8. TurboLaserRS

    TurboLaserRS Proven Member

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    Joined May 14, 2011
    Dayton, Ohio
    YES! You absolutely must preload the tension on the belt BEFORE you pull the grenade pin on the hydraulic tensioner. If you don't, at any time the tensioner plunger could bottom out and you WILL skip timing!
    Please don't run the motor! You are lucky as hell you don't need a new cylinder head.
     

    1K  0

    1990 Plymouth Laser RS Turbo
    11.128 @ 132.500 · 1G DSM
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  9. spyderturbo007

    spyderturbo007 DSM Wiseman

    2,312
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    Joined Dec 20, 2002
    New Cumberland, Pennsylvania
    Setting the tension is a real pain in the a$$. Brain and I went through it yesterday on my Spyder. You have to go very slowly when applying or removing tension from the pulley. You'll want to make very small movements and wait about 20 seconds and keep checking the pin. Once you have it where you want, tighten the tensioner bolt while being very careful not to change the tension. It really helps to have two people for this as I'm not even sure you could do it by yourself. I've never tried, so I can't say for sure.

    You're going to have to remove the tensioner and compress it in a vice. Go very slowly when you compress the piston. Tighten the vice, wait 30 seconds for the piston to compress and then tighten again. Repeat that process until you can put the pin back in the tensioner.
     

    776  0

    1997 Mitsubishi Eclipse Spyder GST
    manual · 2G DSM
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