ultrarunner

After reading howdeeaudi's post, it got me thinking about how Audi projects the MTBF of this component, if at all. In my '01 A6 2.7t example, the recommended change interval is 105,000 miles. So, what is the engineering data on the MTBF which determines the change interval. Is it the OEM provider of the belt?

Just a thought for discussion. I've got 45,000 miles to think about it! :-)

thomas1978

my manual said 90k i think. I got 98 A6 2.8 Q ;o) still have 24k miles to think lol

shatiras

I bought a '99 2.8Q A6 and since it did not come with the maintenance booklet, I went on audiusa.com and looked up the maintenance schedule. The timing belt is indeed recommended for a change at 105,000 miles, but the tensioner roller is recommended at 75,000. The tensioner roller is what actually fails and your engine turns into a pile of junk. I can't imagine the '98 or the '01 to be different. Now who would think to change the tensioner roller at 75,000 ($$$$$$$$$$$$$$$) and then go back at 105,000 and change the timing belt ($$$$$$$$$$$$$$$)? Obviously only Audi...so do both before you hit 75K...

s4master1

but the water pump won't

Peccavis

all the bearing-components - idler roller, TB tensioner roller, & water pump (A, C, & D) that are driven along with the TB itself that are the failure components. When I changed my TB at 74K, the TB looked just like new.

<img src="http://www.ecstuning.com/stage/images/product/engine/mechanical/28TimingBeltLayout-500x375.jpg">

The problem is that the TB drives so many other components (i.e. - water pump) in this engine, which make it all a higher probability failure component.

Eric 2.7

Believe that. This guy knows. Think strongly about doing it at 75k.

CEB

or a sow's ear......