Belt or chain?
 

No I'm not talking 50 shades of grey but engines.

Seem to be finding conflicting answers, got a 4.2 v8 A8 in a pre face-lift d2

Can anyone confirm if it's a timing belt or chain

Many thanks

Lee

Almost certainly a belt +++

Timing belt +++ All D2s have belts, as do early D3s.

There are chains in the heads to link the two cams together but on a PF you don't need to worry about them :)

To swap the belt needs special tools (obviously). I have the crank holding tool, but I don't have the cam alignment tools which go in the back of the heads. I'm not sure who has a set of these tbh:

http://www.audipages.com/Tech_Articl...ical/tbp25.JPG

Ahh many thanks, just re checked what I was looking at and appears it was the 4.2 out of an a4.

Thanks for the help, any suggestions for interval on replacement?

TIA

S4 was the first chain driven v8, so that makes sense +++

No idea on interval I’m afraid...... but I am sure someone else will advise!

80K or five years, whichever is soonest.

Always change the hydraulic damper / tensioner. I've seen more engines killed by failed tensioners than anything else.

I do the water pump and thermostat every other belt. Genuine pumps are <£100 exchange from TPS.

I have them. +++