AAZ Pulleys and Bolts

Post by **Wilma** » 09 Oct 2007, 11:00

Reading in Brickyard about bottom pulleys on AAZ engines working loose. They say that VW realized they had a problem and modified them after a couple of years. Anyone know any way in which you can tell if yours has been modified? Short of a major strip down!

Post by **skell** » 09 Oct 2007, 11:19

Not sure how to tell, but advise either keep checking it is tight and change it at next cambelt change, or if really worried just swap it, bolt is a few quid from VW, I'm changing mine with cambelt sometime soon.

Post by **jamesc76** » 09 Oct 2007, 11:22

you could always wip the bolt out and put some thread lock on it ????

Post by **Westy.Club.Joker** » 09 Oct 2007, 20:16

The modified bolt has a round "pip" on the 12 sided head, it`s quite obvious when you see one. It`s a stretch bolt, so needs to be tightened up as per VW spec, which can be a bit hard, trying to stop the motor from turning over while you do it

You need to lock the flywheel with somthing while you heave on a socket and bar on the bolt. I would be inclined to Loctite it as well, belt n braces

If you`re doing it, give the bottom pulley a wobble before touching the bolt, to see if you can move it, if you can, buy a new lower cambelt sprocket (£25) and bolt (£2) before starting the job, hopefully it won`t have worn the location slot in the end off the crank

Post by **andysimpson** » 09 Oct 2007, 20:42

Replacing the bolt alone is a waste of time and money, new pulley and bolt every 60k and it will never be a problem. The problem was never fixed until they fitted tdi cranks but you will be very lucky to find one. Bolt should be oiled, no thread lock and tightened to 90nm + 90 degrees, once tightened do not touch it agian until next belt change.