Upgrading an AAZ crank pully with a TDI crank pully?

DieselSamurai · Post by **DieselSamurai** » Sat Jul 11, 2009 11:04 am

Is it possible to replace the Crank pulley (harmonic balancer) of a 1.9TD AAZ with a TDI crank pulley? Mine isn't fairing so well and needs replaced. If I can upgrade to a better crank pulley then I'm all for it. Any help would be appreciated.

Thanks Todd.

rabbit_man · Post by **rabbit_man** » Mon Jul 13, 2009 4:08 pm

IIRC it's doable but it takes machining your crank.

surfcam · Post by **surfcam** » Mon Jul 13, 2009 8:33 pm

I've heard people talking about getting it done in place.

Post by **Fatmobile** » Sat Jul 18, 2009 12:39 am

It's not the harmonic balancer/ crank pully that gets changed.
It's the crank sprocket for the timing belt.
The crank needs to have a flat spot machined onto one side.

The sprocket has a D at the end of the part number,.. and is shaped that way.

starrd · Post by **starrd** » Wed Apr 21, 2010 11:40 pm

Here is what is involved in one of the in place processes:

http://www.vwdiesel.net/forum/index.php?topic=25135.0

81caddyGuy · Post by **81caddyGuy** » Thu May 20, 2010 2:35 pm

Not to sound like a noob but mosy of my diesel experiance is on cat equipment. what would be the benefit of using a tdi pully? is this a turbo mod only or is it for NA engines as well???

Post by **Fatmobile** » Thu May 20, 2010 10:58 pm

The normal keyway is weak.
I've seen 2, 1.6TDs with a stripped out crank key,
usually a problem with 1.9s.

81caddyGuy · Post by **81caddyGuy** » Fri May 21, 2010 1:45 am

makes sense. I had a 8v 92 golf with digfiant II fuel sytem and while redoing th engine I found my keyway stripped. I had spares as I worked at a junk yard at the time. so just to clarfiy the TDI pully is the same size as 99% or so MK I/ MK II crank pully just the crank needs to be broached/machined to accept the pully?

very cool.

joat · Post by **joat** » Tue Aug 24, 2010 9:03 pm

reason for stripping is the cog belt doesn't slip like a V belt ... the engine pulses are very strong and beat the $%^& out of the sprocket locating pin..... loss of power and black smoke ... until it slips too much and the pistons kiss the valves.

the newer slot takes the abuse much better.

81caddyGuy · Post by **81caddyGuy** » Wed Aug 25, 2010 11:15 am

I am considering swapping my 1.6L IDI out of the caddy for a MTDI engine so i will not have to go thru the whole broaching process anyway.
If you know where i can get an engine cheap it would be helpful.

fairport11 · Post by **fairport11** » Fri Sep 23, 2011 5:39 pm

i am changing the timing belt on my aaz and notice rubber fatigue on the harmonic balancer. will a tdi harmonic fit the aaz??btw, my crank pulley looks great, no wear or movement to crank.

libbybapa · Post by **libbybapa** » Sun Dec 04, 2011 11:10 am

Yeah, the AHU/1Z harmonic balancer pulleys are interchangeable with the AAZ ones. I've noticed that the engine temps have been a little higher lately on my mTDI AHU. I just figured out that my harmonic balancer pulley has actually separated and the outer part will move a independently of the inner hub. It still looks fine, but a timing mark on the pulley does not land consistently with each crank rev.

Former VWDieselParts.com Forum

Upgrading an AAZ crank pully with a TDI crank pully?

Upgrading an AAZ crank pully with a TDI crank pully?

TDI crank sprocket

tdi pully

tdi parts

Re: Upgrading an AAZ crank pully with a TDI crank pully?

Re: Upgrading an AAZ crank pully with a TDI crank pully?