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    Timing Belt Snapped :(

    My timing belt broke at idle sitting at a stop sign. Can I just replace my timing belt or do you guys think there could be damage? Thanks

    #2
    You bent valves..

    Pull the head and send it out to bimmer heads and have shant take care of you. I find a lot of local shops simply suck are theifs, or both.

    Sent from my SCH-I545 using Tapatalk 2
    -Build http://www.r3vlimited.com/board/showthread.php?t=295277

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      #3
      best pull the head and look im sure something bad happened

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        #4
        Start by removing the valve cover and look for broken rockers. I'm not aware of anyone breaking a TB and NOT damaging something, but I cant say its not possible. While you can replace the belt and then hand rotate the engine to check for valve damage, the best practice is to pull the head.
        Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

        https://www.r3vlimited.com/board/sho...86#post4944786
        Alice the Time Capsule
        http://www.r3vlimited.com/board/showthread.php?t=360504
        87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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          #5
          You just bent 6 exhaust valves sir.
          john@m20guru.com
          Links:
          Transaction feedback: Here, here and here. Thanks :D

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            #6
            When was the last belt change?
            ADAMS Autosport

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              #7
              Pull the valve cover.

              See what it says. It may say 'rocker chunks' or even 'head chunks'

              It's likely you bent one or 2 or 3. Probably not 6, at idle.

              You COULD try putting a new belt on it to see what the damage is
              But there probably is some. If it was me, I'd pull the head.

              Because:
              If you can DIY, it's not too hard or expensive to fix.

              t
              now, sometimes I just mess with people. It's more entertaining that way. george graves

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                #8
                Do the math. At idle the engine is rotating approx 800 RPM - Revolutions per minute. 800 divided by 60 seconds is 13.33. So every second that the engine rotated after breaking the belt it had 13.3 chances to bend / break valves and other parts. That is if you shut the engine down to a dead stop in one second. There was probably alot more than one second that elapsed after that belt gave way.

                Pull. Inspect.

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                  #9
                  I used to have customers (with hondas, mostly civics) that would insist that I try doing a timing belt job on something that alreadybroke. The hondas seem to be the ones that somehow magially never take damager and run safterwards

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                    #10
                    Originally posted by TobyB View Post
                    Pull the valve cover.

                    See what it says. It may say 'rocker chunks' or even 'head chunks'

                    It's likely you bent one or 2 or 3. Probably not 6, at idle.

                    You COULD try putting a new belt on it to see what the damage is
                    But there probably is some. If it was me, I'd pull the head.

                    Because:
                    If you can DIY, it's not too hard or expensive to fix.

                    t
                    We have repaired about 5 of them in the last year or so. One happened during starting and broke 2 valve heads off, the rest bent. Might get lucky and have a couple not bend, but in my experience, most/all the exhaust valves bend. Had one that had zero visible damage upon valve cover removal. If our timing belts "broke" and not stripped the cogs off them, I would say there's a chance only one bent (since the cam would stop moving at that instant), but is what usually happens is a few cogs get stripped off and the cam continues to rotate with the timing severely off, bending all the exhaust side.
                    john@m20guru.com
                    Links:
                    Transaction feedback: Here, here and here. Thanks :D

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                      #11
                      Oh, I'm certain you probably only bent 2, maybe 3, exhaust valves. Shouldn't be any big deal. Just slap a new belt on and you're good to go.

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                        #12
                        There is ZERO chance nothing was damaged. Time to pull the head for a rebuild!
                        BimmerHeads
                        Classic BMW Specialists
                        Santa Clarita, CA

                        www.BimmerHeads.com

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                          #13
                          Originally posted by TrentW View Post
                          Oh, I'm certain you probably only bent 2, maybe 3, exhaust valves. Shouldn't be any big deal. Just slap a new belt on and you're good to go.
                          Sarcasm...just in case.

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                            #14
                            Originally posted by TrentW View Post
                            Sarcasm...just in case.
                            Common, the guy just had his belt snapped...don't pick on him.

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                              #15
                              Originally posted by jalopi View Post
                              The hondas seem to be the ones that somehow magially never take damager and run safterwards
                              Because they're not interference engines.
                              Originally posted by kronus
                              would be in depending on tip slant and tube size

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