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Thread: Mk4 1.6 16V AZD cam belt failed at 3 years, 50k miles, 75mph

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  1. Mk4 1.6 16V AZD cam belt failed at 3 years, 50k miles, 75mph 
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    Having not experienced a failed belt before, I didn't know what had happened when I lost all forward drive and the engine stalled on the M6, when attempting to overtake. There was none of the usual engine resistance from compression, the car just started to decelerate, and dropping the clutch made little difference to how it felt.
    Having been recovered home, I've pulled the engine apart and got the head off, to find that, not surprisingly now, all 8 exhaust valves have been hammered flat with the plane of the head. To the extent that, for a moment, it looked normal! But then as my brain processed what I was looking at, I realised that the valve springs, with no cams behind them, were holding the valves tight shut, and the exhaust ones clearly looked very different to the inlet ones. Then, peering into the valve port I noticed the stems were nicely bent.

    I've been wondering what to do for a few days now. I've done a lot to this car to keep it half decent, as I do 20k a year in it: driver's door lock module, 2 coil packs, steering rack, all shocks, rear trailing arm bushes, near and off-side steering/suspension control arms, track rod ends, all engine mounts, fixed the air vent boot leak, fixed the rear wiper boot lid leak, 4 new tyres very recently (!), fuel filter, oil every 7k, oil filter every 14k, front discs (rears are due before next MOT, so they'd be done too).
    Clutch was done at 70k. I bought it 76k. It's now got 126k on it, and I certainly wan't expecting the belt to shed all it's teeth, seemingly all-of-a-sudden when it was only 3 years old with 50k on it.

    With an unmarked, spotless interior, and a pretty good exterior (bar a scuffed rear wheel arch), I'm struggling to accept that it's a write off. It's outwardly in good condition, and there's too much on it that's been very recently replaced, that is serviceable for many tens of thousands of miles. I was hoping to have got 200k out of this motor, but I'm struggling to find a cylinder head with valves etc all fitted and ready for substituting in for my knackered one. An engine swap-out? Hmmm, too much time:money and risk in that for me (I'd be doing it myself), aside from the cost of an engine in the first place.

    Cut my losses and move on? Buy a similar, and cheap Mk4 1.6 16V that is running properly and cannibalise mine to make whatever I buy just-so? (Mine's was only worth £600 max before the failure, and I was never seriously expecting to sell it when I'd finished with it.)
    It would be great to hear what someone else thinks.

    IMG_20171113_182624.jpg
     
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  2. Re: Mk4 1.6 16V AZD cam belt failed at 3 years, 50k miles, 75mph 
    #2
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    Get a spare AZD engine, take the head off and put on your current block.
    I'd be looking at what caused belt to fail - blocked water pump or tensioner maybe?
     
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  3. Re: Mk4 1.6 16V AZD cam belt failed at 3 years, 50k miles, 75mph 
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    Thanks for your post.
    I took the crank pulley off and the belts cover to have a go at the water pump and the tensioner. Both feel absolutely fine. So it doesn't look like anything seized, and the crank turns smoothly and easily.
    It might be that I can find an engine with belts attached, and can swap the heads over. I could get a new crank belt and cam belt, continue with the existing pumps and pulleys, and if it lets go again somehow, then I'll definitely be done with it. By the end of today i might just have decided I've had enough.
     
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