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audi a3 2.0 tdi (bkd)

timing belt failure

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#1 buzzing

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Posted 06 October 2011 - 05:59 PM

hi has any one had the problem of timing belt tensioner bolt sheering off the head.
as i have and spent £900 getting the head rebuilt (new valves, cam followers etc.).
the company drilled and tapped the tensioner stud witch was the cause of failure.
so new belt, water pump and all the head reworked.
customer happy with £1400 bill, till 2 months and 1k later same thing again
bolt broken out of the head. can any one shed some light on this problem. thanks buzz

#2 TecSer

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Posted 16 October 2011 - 09:23 AM

Hi
I've been searching a couple of German Audi forums, but couldn't find anything like the trouble you have. The only well known problem is a torn cylinder head within a coolant duct.
May be, you've got a single problem? How did the company fit the bolt?

#3 buzzing

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Posted 17 October 2011 - 12:31 AM

hi they drilled the old one out and heli coiled it.

#4 TecSer

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Posted 17 October 2011 - 08:29 AM

Hi, hmm, that seems to be the way it needs to be done. It's a bit wiggy that the new bolt sheered off again. Did it really sheer off or has it torn the heli coil out off it's bore?

#5 buzzing

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Posted 17 October 2011 - 05:21 PM

ya this time it pulled the stud and the coil out. they was put in with loctite. (may be not strong enough. witch i cant see because i have none people use these on head bolts)

#6 TecSer

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Posted 17 October 2011 - 08:48 PM

normally heli coil is strong enough. Is the head (valves, followers) badly damaged again?




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