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Dead motor, but why? Need investigators

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    #16
    The tensioner has a bearing but the stamped idler pulley does not. They, along with the stamped cam gear, were prone to fatigue and fracture. I'd check for a split gear which would easily cause a thrown belt.

    The "broken" belts I've seen has stripped teeth, but remained in place.
    Deck Lid and soft top Shocks on hand

    Seat shocks on hand for immediate shipment
    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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      #17
      Yeah tensioner is dead and on the piss
      89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

      new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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        #18
        Tensioner would also be my guess.
        john@m20guru.com
        Links:
        Transaction feedback: Here, here and here. Thanks :D

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          #19
          M20 is hateful and committed suicide.

          Time for a proper twincam
          OBD1 M54/M52TU swap as a M50b25

          Z4 non powered steering rack fits e30



          Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

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            #20
            Originally posted by Wanganstyle View Post
            M20 is hateful and committed suicide.

            Time for a proper twincam
            shut your whore mouth

            Also, Simon, if you have all these pics and the part was new out the box, you can contact the manufacturer and they might compensate you for the damage
            Originally posted by wholepailofwater
            Q
            :devil:


            WTB: Dove Grey e36 Front Door Panels (2 door)

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              #21
              Originally posted by MrBurgundy View Post
              shut your whore mouth

              Also, Simon, if you have all these pics and the part was new out the box, you can contact the manufacturer and they might compensate you for the damage
              I have the receipt and would love for someone to compensate me so I can get some head lol a WOT head to be specific ... ya filthy bastards
              Simon
              Current Car:
              -2003 Mini Cooper R50 (daily)
              -2002 MR2 Spyder (project)
              Previous Car Count : 24 ... and climbing...

              Make R3V Great Again -2020

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                #22
                Originally posted by jeffnhiscars View Post
                The tensioner has a bearing but the stamped idler pulley does not. They, along with the stamped cam gear, were prone to fatigue and fracture. I'd check for a split gear which would easily cause a thrown belt.

                The "broken" belts I've seen has stripped teeth, but remained in place.
                This snippet of information just cleared up a long standing question I had with the history of my engine. The timing belt had failed exactly as you said, stripped teeth. In my case it was on the lower crank pulley, which I imagine typically occurs during the initial start-up of the engine?

                The low speed "break" would explain why my bottom-end made it out okay.

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                  #23
                  Had it happen to a locals' car we just did a rebuilt head on. Tensioner failure.

                  Will point Varg to this thread, it also happened on his car, and have a customer car in the shop right now we did a head on a few months ago that is complaining about belt squeak. Varg just sent me pics of yet another local with the same issue.


                  Seems as we have a bad batch of belt tensioners?
                  john@m20guru.com
                  Links:
                  Transaction feedback: Here, here and here. Thanks :D

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                    #24
                    You are not alone, Simon...

                    https://www.r3vlimited.com/board/sho...&postcount=246
                    john@m20guru.com
                    Links:
                    Transaction feedback: Here, here and here. Thanks :D

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                      #25
                      I've worked on ducati motorcycles for many years and they use a similar timing setup with an adjustable tensioner. Over the years i've had 2 or 3 that pushed the belts into the timing covers and it was always a bent or mis formed tensioner. The pulley was not square to engine.

                      I wonder if this is what is happening here, a poorly formed tensioner bracket.
                      Lorin


                      Originally posted by slammin.e28
                      The M30 is God's engine.

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                        #26
                        OPs case is cloudy, he is yet to post any pictures of his tensioner area or provide any details on its condition. To wear the belt like that, from the outside in, the tensioner had to be stuck solid, unless it was rubbing on something else.

                        As far as the other cases go....bad batch of tensioners is pretty disturbing news.
                        I wonder if anyone with TB walking issues put the dial gauge on the tensioner and see how much play one has.
                        Typical reason for the belt walk is the overtensioning the belt. Too much tension can deflect the pulley (tensioner pulley) and makes the belt walk side to side. Did the installer make the spring do the job?

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                          #27
                          The tensioner has a set spring, that's the perfect amount of pressure after a few rotations. The OP has been around the block with e30's. Perhaps it was a mistake, but I would be inclined to say no. The tensioner is merely riveted on the bracket. If they aren't stamped properly, the belt will slide off the pulley, just like a band saw, or sanding belt.

                          Very disturbing news. We warrantied the job here at the shop since we installed a rebuilt head, it included a timing belt kit we installed, and provided the parts. We always use Contitech, and have done so for a huge number of m20's over the last few years.
                          john@m20guru.com
                          Links:
                          Transaction feedback: Here, here and here. Thanks :D

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                            #28
                            any more reports on these issues or updates from OP ?


                            Just a heads up on ContiTech belts, I got one with my last order.
                            Anyway, my new Conti belt teeth were full of rubber crap/dust, a byproduct of belt teeth forming/cutting. I actually had to use stiff brush to clean all that shit out, about 1/4 cup full. Looks like all teeth got cleaned up and consistently shaped to the eye but I do not trust this belt and Conti quality control for their aftermarket cuz of this now. Used Conti for years on vw and bmw, never seen this bs.

                            PS.Anyone ordered Conti belts recently and noticed anything similar? You can't miss it, it will make a mess just by handling the belt.
                            Last edited by zaq123; 01-30-2019, 08:02 AM.

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