Thanks for your response.
I appreciate that the water pump is driven from the same belt, but is
it common for a waterpump failure to wreck an A4 engine?
Or perhaps there is a more general issue with A4 timing belt failures
as outlined by the US class action?
I would be interested in other peoples experiences?
If its driven by the T-belt then a WP failure would cause havoc. At 70K
miles you'd be advised to think about a T-Belt (and tensioner change) and to
change the WP and thermostat while you were in there.
I know the VAG service interval is 100K+ miles but prevention is much
cheaper than cure if it fails.
There were only a few years where the engine design was such that a failed
WP would cause a TB failure, so in the grand scheme of things, it's probably
not very common. But it's not impossible either.
Usually, the most common reason for TB failure is a prematurely (if you look
at Audi's replacement recommendations) broken TB tensioner. But whatever
the cause (broken tensioner or seized WP), the result is generally the same:
bent valves on the engine.
Those who are "in the know" replace the TB, tensioner, rollers, and WP every
60K miles, just to be safe.
Audi UK now schedule timing belt change on all cars at four years/60k
miles, whichever comes sooner (except the RS6, which is three years).
This applies retrospectively, to all models with a timing belt.
Peter Bell - firstname.lastname@example.org
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