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Broken Timing belt

Discussion in 'General Tech and Maintenance' started by wiredjosh, Sep 8, 2004.

  1. wiredjosh

    wiredjosh Member

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    Hey all,

    I helped a friend put an H22 in his F-powered prelude, and shortly thereafter broke the timing belt. We found that the tensioner support bolt had broken, and have waited for a few parts to come in and crap, and so tonight we had everything and put in a new belt, bolt, and tensioner. We put it together and compression tested it and got 240-220-235-240, which doesn't seem too bad to me. Is there any reason he can't drive it? Is there something that I'm overlooking that could be wrong with the car still? I've never had a car that I worked on lose its timing belt, and so it's kinda new on me.

    Lemme know what you guys think! :worthy: :worthy:
     
  2. tab

    tab Super Moderator

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    Hopefully you didn't bend any valves.

    That 220 looks kinda low compared to the other three. On most cars, you want the numbers to be within 10 psi of eachother. 220 is a bit lower than 240, whereas 235 seems reasonable. If you get any valve tap or the engine doesn't run right, shut it down immediately.


    It's too bad you didn't compression test the engine before the belt broke, so that you had some numbers to compare. I wouldn't be surprised if you have one or two bent valves.
     
  3. reckedracing

    reckedracing TTIWWOP VIP

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    are you familiar with leakdown testing?

    that could help you diagnose the situation...

    i believe they look for over a 10% variance between the cylinders...

    but i agree with the above that you may have a couple tweaked valves on cylinders 2 and 3...

    it doesn't sound too serious though, performance will be slightly hurt and it will more than likely burn more oil now as the tweaked valves wear on the valve seals...

    make sure its timed right and it should be ok to drive
     
  4. dohcvtec_accord

    dohcvtec_accord WRX Sellout

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    Moving this to General Maintenance, since people don't venture into the Dark Side very much. :)
     
  5. wiredjosh

    wiredjosh Member

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    I am familiar with leakdown testing, but I don't think I have the equipment to do it. I've also heard of using oil in the cylinders to test for rings vs. valve damage, but I don't think that would be of much use to me right now. Can you give me specifics on what it takes to leakdown a motor? Maybe I can get that to give me some answers.


    Thanks a bunch guys!!!!
     
  6. tab

    tab Super Moderator

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    How to: Leak down and Compression tests by Brian Cummiskey
     
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