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28th August 2018, 09:03 | #21 | |
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28th August 2018, 09:11 | #22 |
I really should get out more.......
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Friend recently came over with his “new” V6 which was making a horrible racket, front belt looked like this:
No date marking visible, nothing stamped visible. I found I could move the tensioner wheel with a magnetic telescope. Yesterday I saw the remains of the tensioner literally in bits, spread / lodged in various places. Anxious days follow. Regards |
28th August 2018, 11:01 | #23 |
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Mike,
I can’t quite tell from your picture; is this the ancillary belt or the timing belt? Simon
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28th August 2018, 11:23 | #24 |
I really should get out more.......
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It's the timing belt Simon, the ancillary belt was in shreds, perhaps due to debris from the timing belt tensioner. We found one piece of thin, twisted metal up by the power steering pump, the tensioner bolt with several stripped threads wedged in the sub frame. The timing belt is still in one piece however, the rear belts are in a totally different state, rubberised, almost as if recently changed. Very strange.
Mike |
28th August 2018, 14:05 | #25 |
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I was in a similar position last year debating whether to get the cambelt and waterpump changed along with other bits that amounted to around £800. F1 Autocentres and many independents use Payment Assist https://www.payment-assist.co.uk/ they offer 0% APR flexi-payments into 4 equal payments (once per month).
I used that to soften the £800 bill and did so again a 2nd time for 4 new tyres. |
28th August 2018, 15:51 | #26 | |
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Simon
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28th August 2018, 19:31 | #27 |
I really should get out more.......
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Simon,
T'was the one within the pulley wheel. No sign of Loctite which I see on every other bolt on the car, the threads weren't totally stripped, damaged in sections is probably more accurate. Why I don't know, partly because I wasn't the mechanic performing the autopsy, but I saw enough of the hammering of the casing caused by pulley wheel - no major damage, just deep scratches. We are more concerned about possible internal damage - time will tell. Mike |
28th August 2018, 21:45 | #28 |
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Ahh, that’s the one which on most replacement pulleys is supplied loose. The innocent owner/mechanic then fits it in good faith and some time down the line ... aargh, the cambelt has given way! Errr, no it hasn’t actually.
This is a very helpful story Mike, thank you. Your friend has been very lucky that the belt was strong enough to resist the stress it has experienced. Simon
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29th August 2018, 00:13 | #29 |
Posted a thing or two
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I agree that worn/'bouncing' tensioners and seizing water pump and tensioner bearings are the most likely causes of belt failure. I've had one timing belt fail on a Peugeot diesel at 115k (it had never been changed), one on an A4 1.9TDi at 179,000 - previously changed at 60 and 120k, but I think the tensioner hadn't been, and 1 ancilliary belt tensioner bracket badly bent through snatching/rough bearing, and 1 ancilliary belt saved in the nick of time - bouncing due to wear in the alternator freewheel clutch (snatching), again, Audi A4. Try running the engine with the belt cover off, see if it runs smoothly, and how does it look - any sign of cracking on the outside or at the bottoms of teeth, is the outside very shiny, with makers markings completely worn off? All rubber products degenerate with age/heat/ exposure to UV or contaminants. The oily compounds in them which keep them supple, evaporate off with time and make them harder and more brittle which is why, however low the mileage, most manufacturers recommend no longer time interval than 5 years.
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