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    Thread: 99mm tdi 1.8t / 16v Timing drive gear

    1. Member ens's Avatar
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      09-09-2014 10:28 PM #1
      Im sure this was covered somewhere on here but I could not find a solid answer.
      I have a 20/20 running a 99mm crank.
      The 16v timing drive gear has a different seat than the tdi crank.

      Tdi gear seat


      16v gear seat


      I was thinking of taking it to a machine shop to weld and recut the gear.
      Is there any other solution, without machining or dowel pinning the crank?
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      09-23-2014 09:53 AM #2
      always wanted to know what others are doing for this.

    3. Member thescirocco.com's Avatar
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      09-23-2014 07:01 PM #3
      Can't you use the TDi gear? I've heard of the 16V key shearing off, and the diesel gear looks like a better design.
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      09-25-2014 10:02 AM #4
      No the 16 valve uses a different type timing belt then the tdi.

    5. Member MikkiJayne's Avatar
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      09-25-2014 11:29 AM #5
      They look the same profile from the two pictures in the first post. Are they different widths?
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    6. Member ens's Avatar
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      09-25-2014 11:24 PM #6
      the 16v gear is wider and has a different tooth profile than the tdi
      im thinking
      1. weld and machine timing drive +dowel pins
      2. weld and machine crank +dowel pins
      3. cut 16v timing drive tooth + add two 6mm dowel pins

      even though my machinist said its not a good idea, right now im going with option 3.
      he will drill and ream the 6mm on the timing drive, then i plan to bolt it up with an old bolt that i cut the head on, and drill right into the crank for the dowel pin.
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    7. Member Issam Abed's Avatar
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      10-19-2014 03:53 PM #7
      • Machine 99mm TDI crankshaft (I assume you modified a BRM unit to get that 99mm stroke?) snout to accept 16V Timing belt sprocket keyway
      • Dowel pin sprocket to crankshaft snout
      • Use ARP Bolt

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