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I’ve seen this question asked a few times now and as I’ve now tried all 3 camblets on my stroker I thought I’d put all my findings in one thread.
There are three different cambelts for the I5 20VT turbo:-
3B – 147 teeth Part No. 054 109 119G ( Gates Powergrip 5182XS )
ABY – 151 teeth Part No. 054 109 119H ( Gates Powergrip 5269XS )
ADU – 150 teeth Part No. 034 109 119C
Gates supply the OE belts to Audi, so you get the same belt for a fraction of the cost from Audi. Unfortunately, even though they make the ADU belt, they do not list it, Audi must have exclusive rights on that one.
http://www.gatesautocat.com/
All the information in this post is based on using the AAT/AEL block with a 3B waterpump as the cambelt tensioner. You can use the ABY tensioner but it involves extra machining and you have to drill into the waterjacket which means sealing the bolts when fitting it.
3B belt
As this is the shortest of the three belts, it means the waterpump is going to be at the bottom of it’s adjustment. You will have the extent the slots slightly and put a flat on the bottom of the pump to allow it to go down far enough to fit the belt.
You can see here I’ve extended the top of the slot to allow it to drop down
And the flat on the bottom
This is the Gates Powergrip belt:-
http://www.ebay.co.uk/itm/AUDI-80-90...item4175eebd3e
ADU belt
This is the ideal belt to use as it’s in the middle length wise, and this is what I used last time I built the engine. This belt needs no modifications to the pump and puts it in a similar position to the std engine.But as Audi dealers no longer sell them, they have to be ordered from Audi Tradition ( €80!! ) and even they don’t have any at present.
ABY belt
I decided to try the ABY belt this time. The belt is readily available, I got mine from here:-
http://www.ebay.co.uk/itm/GATES-5269...item43cec46e2d
As it’s the longest belt, the waterpump is now going to sit at the top of it’s adjustment. This time there is no need to extend the slots, it’s just long enough as standard. All seemed fine until I started the engine, then I fould hear a metallic tapping from the front of the engine, investigation with a mechanics stethoscope narrowed it down to the water pump. I stripped it down and found marks on the impellor blades where it had been fitting the block. I polished these out with a die grinder and also removed material from the block until there was no noise.
Here you can see I’ve painted the impellor to make it easier to see where it was catching
And here is the area on the block that I had to remove material
I’m guessing I had to take off around 2mm here. The first time I put it back together I fitted the pump and turned it by hand and could feel no sign of it hitting the block, but once I’d fitted the belt and tensioned it, I could here it hitting slightly with the stethoscope so I had to strip it down and remove more material. Now listening to it with the stethoscope, it’s silent.
There are three different cambelts for the I5 20VT turbo:-
3B – 147 teeth Part No. 054 109 119G ( Gates Powergrip 5182XS )
ABY – 151 teeth Part No. 054 109 119H ( Gates Powergrip 5269XS )
ADU – 150 teeth Part No. 034 109 119C
Gates supply the OE belts to Audi, so you get the same belt for a fraction of the cost from Audi. Unfortunately, even though they make the ADU belt, they do not list it, Audi must have exclusive rights on that one.
http://www.gatesautocat.com/
All the information in this post is based on using the AAT/AEL block with a 3B waterpump as the cambelt tensioner. You can use the ABY tensioner but it involves extra machining and you have to drill into the waterjacket which means sealing the bolts when fitting it.
3B belt
As this is the shortest of the three belts, it means the waterpump is going to be at the bottom of it’s adjustment. You will have the extent the slots slightly and put a flat on the bottom of the pump to allow it to go down far enough to fit the belt.
You can see here I’ve extended the top of the slot to allow it to drop down
And the flat on the bottom
This is the Gates Powergrip belt:-
http://www.ebay.co.uk/itm/AUDI-80-90...item4175eebd3e
ADU belt
This is the ideal belt to use as it’s in the middle length wise, and this is what I used last time I built the engine. This belt needs no modifications to the pump and puts it in a similar position to the std engine.But as Audi dealers no longer sell them, they have to be ordered from Audi Tradition ( €80!! ) and even they don’t have any at present.
ABY belt
I decided to try the ABY belt this time. The belt is readily available, I got mine from here:-
http://www.ebay.co.uk/itm/GATES-5269...item43cec46e2d
As it’s the longest belt, the waterpump is now going to sit at the top of it’s adjustment. This time there is no need to extend the slots, it’s just long enough as standard. All seemed fine until I started the engine, then I fould hear a metallic tapping from the front of the engine, investigation with a mechanics stethoscope narrowed it down to the water pump. I stripped it down and found marks on the impellor blades where it had been fitting the block. I polished these out with a die grinder and also removed material from the block until there was no noise.
Here you can see I’ve painted the impellor to make it easier to see where it was catching
And here is the area on the block that I had to remove material
I’m guessing I had to take off around 2mm here. The first time I put it back together I fitted the pump and turned it by hand and could feel no sign of it hitting the block, but once I’d fitted the belt and tensioned it, I could here it hitting slightly with the stethoscope so I had to strip it down and remove more material. Now listening to it with the stethoscope, it’s silent.
, can u reupload the pictures?Photobucket seems to have some "problem" 
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