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    1. · Registered
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      9,288 Posts
      That is weird. You need to replace the cam bolts anyway. I would do so. They definitely are NOT BMW bolts (which, in this application, suck), but perhaps the bolt head was too big for the application. Make sure you get bolts with heads that are no taller than stock. There is a thread somewhere on the board in which I posted a link to the bolts we always use. Black Oxide 12.9.

      --Peter

      PS: Here you go: https://www.amazon.com/gp/product/B...e_o08_s00?ie=UTF8&psc=1&tag=m5boardconvert-20
       
    1. · Registered
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      9,288 Posts
      How necessary is it to replace 07119919625? I ask because I'm having a heck of a time finding them, seems the part or part number is discontinued. Web searches are indicating it's superseded by "ISA Screw 07129903807". If I wanted to shop a replacement from McMaster-Carr etc, what should I be looking for from a material/plating stand point? Socket head full thread M6x25 10.9 or 12.9 zinc-plated?


      I'm in the middle of a chain guide replacement and doing the vanos work while I'm there.
      Absolutely do NOT re-use those bolts (the bolts that connect the cogged gears to the cams). We do not even use brand new BMW bolts for that application, as they are easily stretched Grade 8.8 bolts. Torque them to 12.5 NM and watch them snap. We use 12.9 socket heads and torque them to 12+NM. The E46/S54 guys do the same thing.

      --Peter

      Here on Amazon: https://www.amazon.com/gp/product/B01DJAYH56/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
       

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