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Cam belt snapped

Discussion in 'Audi S4/A4/A4 Cab (B8 Chassis)' started by Joelboy, Mar 20, 2012.

  1. Joelboy
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    Joelboy New Member

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    [Mar 20, 2012]
    Hi guys,
    The wife was driving down the motorway in her a4 07 cab. The oil pressure warning light started flashing so she slowed down to pull over doing about 60 mls/hr and the engine juddered and died. Got car recovered to local garage, he told me the cam belt had snapped and all 24 valves were broken, but needed to split the block to find any other damage. Meanwhile called Audi who said they would look at it to install new engine for a small labour cost £800 (go for it I thought). Just had a call saying cannot look at it any further until permission from Audi uk because the cam belt is not worn and that it has a clean break? The car only has 49000 miles!!!!!! Does any body have any views to why the belt would snap without being worn so I have a bit of ammo when he calls again and try's to fill me full of £7&@.
    thanks.
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  3. murran
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    murran Active Member

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    [Mar 23, 2012]
    she sure the oil light started flashing before the car cut out? how long was the light flashing? this maybe a clue to why it broke!

    24v? assuming its a v6 diesel then, what engine code?

    cambelts can break in 2 ways for 5 different reasons
    the 2 ways are;
    1) the teeth themselves strip off the belt leaving the backing intact.
    2) the backing itself breaks.
    reasons for the belt breaking are usually.
    1) its worn out/overdue for a change........ 7 times out of ten teeth strip off in this situation, the other three times the backing breaks.
    2) a failure of a cambelt roller or water pump....... making the belt run out of line....... or component seizes up, generally rollers and waterpumps work on the backing side of the belt.
    3) siezure of a camshaft in the head...... if the belts in good condition this will snap the backing. if its a bit worn already it'll strip the teeth.
    4) a fluid leak into the belt area...... the fluid (oil/coolant) will breakdown the rubber components till it snaps.
    5) failure of the tensioning system...... either letting the belt go completely slack to the point it lets the timing belt jump teeth. or its just not as tight as it should be, flapping about excentuating wear characteristics, belt fails before its time.

    it is very odd if its a clean break on the belt and they cant see a reason for it. ie; non of the above.

    hope this helps!
    Last edited: Mar 23, 2012
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