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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old June 8th, 2018, 13:38   #16
1975 Kombi
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Quote:
Originally Posted by Windex View Post
As above, the snout on the AAZ cranks is a weak design.

Best option is to remove the crank and machine it to the D-shaped later style and use a ALH/AHU crank pulley.

Failing that, it would be wise to check and replace the crank pulley you have now, using a new crank bolt torqued to spec.

Also, install a later style one-way alternator pulley to relieve the inertial forces on the crank pulley from the alternator rotor.

What did the alternators come on? I have never heard of a one-way alt.
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Old June 8th, 2018, 14:25   #17
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Pulley.

It is a pulley with a one-way clutch.

https://www.idparts.com/alternator-p...k6-p-1118.html

One vendor example
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Old June 8th, 2018, 14:44   #18
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Added to all VW diesels post-AAZ, as part of their effort to solve the AAZ crank snout shortcoming.

https://youtu.be/fq62mPGVTTY?t=1m22s
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Old June 8th, 2018, 15:33   #19
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When I inspected the snout on my AAZ, it was perfect. The sprocket was also, so I just reinstalled everything with a new bolt.

I’m using all the A1 accessories on this engine, so I’m guessing the v-belts give everything some slip, that’s needed.

The crank can always be cut later, if needed.

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Old June 9th, 2018, 12:40   #20
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So my alt is toast anyway. Had sat for 10 years and was seized so I cranked the crap out of it by hand and broke it free. So if I was going to replace the alt with another direct fit could I put a later ALH alt on it with no mods or what is the best alt with no mods. Thanks
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Old June 9th, 2018, 15:18   #21
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Your alternator is specific to the AAZ in part because it has specific wiring to drive the tach.

In terms of an upgrade, an over-run pulley can be easily retro-fitted to an OEM AAZ alternator.
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Old June 11th, 2018, 09:13   #22
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Ok one last question. I have an ALH diesel pulley now but it looks like at some point the alt voltage reg toasted and took out the Alt wiring.

Does anyone have a rear shot of the alt or a wiring diagram. My kid has my Bentley for the Passat.

I believe at the Alt there is a red/black wire and blue in a female plug which are no longer there. Red/black(D+) - idiot light on dash and blue(W) - tach also if I remember correctly. And big red(B+) power wire. Previous Owner made some new thing I think.

Last edited by 1975 Kombi; June 11th, 2018 at 10:53.
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Old June 11th, 2018, 10:04   #23
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On a separate note could I not just use the ALH Alt??? Just take the alt wiring from an ALH and apply it to the AAZ?? Plugs will be different but I can splice them together.

Last edited by 1975 Kombi; June 11th, 2018 at 10:34.
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Old June 11th, 2018, 12:38   #24
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As posted, you'd need to add the extra internal wiring to run the tach (and oil pressure warning system)... it's not a bolt-on.

Not hard to do, but would need to be done. The tach terminal wiring (W terminal) is just a wire to one of the diodes on the other side of the output.

Are you sure it will fit mechanically... from a mount but also shaft offset perspective?
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Old June 25th, 2018, 16:46   #25
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What's the torque on the new clutch pulley? I've bought the tool and have a functioning clutch pulley but need the torque spec. Thanks

Found it 59ft/lbs

Last edited by 1975 Kombi; June 25th, 2018 at 17:19.
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