In the vag-com 93 group, the camshaft position deviations are shown, and their position relative to each other changes when the chain is stretched.
Some nuances of checking the condition of the Audi a6c6 chain
1) Run on cold at start-up, then at idle, then on warmed-up
2) the Values should ideally be around 0, the allowed deviations are + / - 10 (which means going to minus or plus - not found)
3) the Values should not float, but also should not be constant when you press the gas
4) this group is more applicable for checking the installation of the chain after repair
5) There is an opinion that the chain does not stretch, but the rollers and sprockets wear out, but this is practically not visible in the 093 group.
6) if the tensioner is faulty, then there will definitely be extraneous sounds, especially when starting the engine on a cold night
7) If when starting a cold engine , the values go to minus, but on a warm+, then only the tensioners need to be replaced,
8) if the engine is heated to a value of more than +10, the timing chain must be replaced
9) If 2 or 4 Windows in the same group will simultaneously jump to the same values, the reason is the Central chain tensioner.
10) are the tensioners the old model and the new, how to distinguish do not understand, write that in the design of the new added coil springs, there is information that since the end of 2007 started to install the new
On the forum audi-club dedicated circuits over 150 pages
www.audi-club.ru/threads/cep-...
Conclusions: the main thing is that there are no jumps and the values for cold and hot do not differ much. If the cold one value, but stable, and the warm another value, but stable and these values do not differ much - everything is normal.
If the cold jumps or values are very different from the warm-up-there are problems
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My 2008 Audi A6 C6 engine 2.4 BDW (replaced under warranty in 2011)
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