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OMG Timing belt broke on my 2004 A8, catastrofic damage-WTF

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OMG Timing belt broke on my 2004 A8, catastrofic damage-WTF

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Old 12-02-2008, 07:20 AM
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Default OMG Timing belt broke on my 2004 A8, catastrofic damage-WTF

I'm so pissed I don't know where to start. Sure I have 110,000 miles and know I'm due for a new belt but it didn't happen in time. I searched the archives and didn't find any D3 cars with a broken belt. It started last week when the check engine light came on, car ran ok but the VAG codes showed cam shaft sensor. I imediately parked the car and made an appt for the belt change. I had the car towed but when I went to start it to help it on the tow truck it wouldn't start. Apparently that damage was done right then. For Gods sake why do the make the most important part on the entire car out of rubber? Can't they use a chain like the W12 or a carbon fiber belt if the know it has a contact engine??? I just got the call so I don't have the heads off yet to determine the amount of damage but it doesn't sound good, he said the belt was broken when he opened it up. Excuse me while I scream!
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Old 12-02-2008, 07:33 AM
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Default Excuse the cuss words inside....

you be fvcked!

They went to the chain with FSI. Manual says 75K replacement, I'll probably wait until 90K, but then again it depends.
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Old 12-02-2008, 07:57 AM
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Default Yeah replace at 75K and again at 150K. If you went 110K on first orig belt then Ouch.

And thanks for Finding the Edge of the Envelope where that Demon Lives.
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Old 12-02-2008, 09:02 AM
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Why would you go longer than the recommended interval?
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Old 12-02-2008, 10:00 AM
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Default Re: The belt does not fail its the rollers that fail and snap the belt

just did my 02 s6 @ 75k belt is fine but still changed it out dont push the service its not worth the risk.
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Old 12-02-2008, 11:05 AM
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Default Big risk to ignore the service interval on the TB.

Not to rub salt in the wound - I'm sorry this happened to you, but you were nearly 50% over the 75,000 mile mark.

Chances are the belt broke when the tensioner bearing failed, and the tensioner seized up. The belt is very strong, it seldom just breaks on it's own. That is why the recommended interval is mileage based - not time based.

Hopefully you have limted valvetrain damage. Those sodium-filled valves are not cheap!

One good thing that may come out of this (for others) is that the failure point is now known.

Good luck and keep us posted on what is discovered by the tech.
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Old 12-02-2008, 02:35 PM
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Default Re: Why would you go longer than the recommended interval?

You would do it for the reason I am doing it. The stuff dreams are made of: money.

I'm at 99,500 miles. I don't do too much rough driving. Looks like it's time to re-inspect the belt.

I was hoping to get double the life (150k) but it looks like it's not gonna happen.
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Old 12-02-2008, 02:42 PM
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Default I would replace it and the other parts that go with it

It's probably a $1500 job, otherwise it will cost you $5K plus.
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Old 12-02-2008, 03:09 PM
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Default They can fail in other ways

Another common timing belt failure mode is for the area where the rubber teeth meet the belt to start cracking over time (due to constant flexing + heat cycles). Eventually, with the weakened teeth the torque of the crankshaft shears them off. Next time around, if it gets that far, the crank rotates without moving the cams and it's game over.

Driving a car hard really has no bearing on the life of the timing belt. It's really all about the heat cycles.
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Old 12-02-2008, 04:12 PM
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Default I had a T-belt jumped on my wife's A6. I had to replace valves, head bolts, head gasket,

intake gasket and a few more things + the t-belt job. It happened at 110K. Water pump seized and that was enough to ruin the belt. BTW she never rev-ed it over 2500rpm.
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