Took my A6 2.5Tdi into the garage because it was very rattly at tickover but smooth once driving. When we lifted the bonnet to look the cambelt was smoking! May have just caught things in time but what could have caused this? Had new injectors in the spring at 140,000 miles, glowplugs in July because of poor starting - this didn't improve things until the pump timing was redone in August. Last cambelt change was at 109000 now at 150000. Any bright ideas?
hfo
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Check HJ's car-by-car breakdown, but IIRC, the Audi TDi's suffer cambelt failure when the water pump goes.
Chad.R
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So do early Volvo 850 TDIs with the same engine and VW Caravelle 2.5 TDIs. Later cars (and most cars by now) have a modified water pump which is less prone to packing up.
HJ
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Thanks, so if the pumps failed and possibly seized that would have caused the teeth to jump and eventually melt? Is there any possibilty that bad pump timing could have played any part ?
hfo
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Most likely to be caused by a seized or partially seized water pump which is in an unusual high up position on this engine. Late engiens had a much better water pump and Volvo now reckons its belts good for 100k.
HJ
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