Author Topic: Anyone Know Any Bad Info On the 1.9L TD AAZ motor(goodorbad) (Read 4709 times)

James8485 · « **on:** December 11, 2007, 07:48:10 pm »

i have a 97 golf TD AAZ my crank doesnt wobble is this a good motor??
any thing i shou,d know about>

vanagonturbo · « **Reply #1 on:** December 11, 2007, 09:03:07 pm »

That is a very little amount of info for expecting such a concrete response. do a compression test. that will help us help you

jimfoo · « **Reply #2 on:** December 12, 2007, 07:12:15 am »

If you mean anything specific to the 1.9, I think the crank pulley is really the only problem. Just keep an eye on yours.

bert · « **Reply #3 on:** December 12, 2007, 09:43:40 am »

My AAZ has the TDI crank already in it,the unit was a vw exchange engine so they rectify the crank problem,a good tdi crank looks like this

Bert
And its got a T3 on it :twisted:

jtanguay · « **Reply #4 on:** December 12, 2007, 01:04:17 pm »

i think it was on this site i heard of someone even with the TDI crank sprocket having an issue. get the one way clutched alternator pulley from a TDI engine and you should be good to go.

the main reason for the cranks going is because the alternator is a large rotating mass at high rpm's. when the engine slows down (from say 3000 rpm to 1000 rpm) it does this quite rapidly, but the alternator doesn't respond so quickly and puts back force on the crank. after a while it can loosen it just enough so that the timing belt can either slip or screw up timing enough that the valves hit the pistons. either way its not pretty. the old 1.6's aren't affected because of the v-belt system and the way it is setup.

either way you should have a really nice motor and it will last you a long time if you take care of it (good synthetic oil, religious oil change intervals, driving style; take it easy when the engine is cold, etc)

bert · « **Reply #5 on:** December 12, 2007, 02:12:44 pm »

Got the T shirt :wink:

one way pulley fitted

Bert

Vincent Waldon · « **Reply #6 on:** December 12, 2007, 04:40:18 pm »

yup, gonna take pictures when I install my 1-way pulley (gotta do some drilling and tapping to make it fit on my early-model alternator and some pics might save someone some time) and once you see how it works you understand the pressure it takes of the crank pulley.

Black Smokin' Diesel · « **Reply #7 on:** December 12, 2007, 04:49:05 pm »

Quote from: "Vincent Waldon"

yup, gonna take pictures when I install my 1-way pulley (gotta do some drilling and tapping to make it fit on my early-model alternator and some pics might save someone some time) and once you see how it works you understand the pressure it takes of the crank pulley.

Where did you guys get the one way pulley? I'm looking into a serp belt conversion on my TD, that would be a nice upgrade.

bert · « **Reply #8 on:** December 13, 2007, 12:05:34 am »

Mine came from a 120A audi TT alternator :wink: the car had done 38 miles and was wrote off,the alternator was cracked but the pulley was mint

Bert
If you rev the car flat out then let it idle,you can hear the alternator slowing down after the revs drop,so no strain on the crank pulley.

Vincent Waldon · « **Reply #9 on:** December 13, 2007, 12:34:03 am »

It's part # 028 903 119AA.. pricey little sucker... and you need some fancy Metalnerd tools to put it on... but it's way cheaper than a crank !

jimfoo · « **Reply #10 on:** December 13, 2007, 07:08:30 am »

Ok, since I will be doing the crank mod since my crank will be out this time around, does any TDI sprocket work or just certain years? I think machine time is close as there is a package at the post office for me. :twisted:

Black Smokin' Diesel · « **Reply #11 on:** December 14, 2007, 03:36:18 pm »

Quote from: "bert"

Mine came from a 120A audi TT alternator :wink: the car had done 38 miles and was wrote off,the alternator was cracked but the pulley was mint
Bert
If you rev the car flat out then let it idle,you can hear the alternator slowing down after the revs drop,so no strain on the crank pulley.

With the tach being RPM driven, does this affect the reading?

Vincent Waldon · « **Reply #12 on:** December 14, 2007, 04:46:57 pm »

Yup.

Not a problem on its native TDI since the tach signal comes from the ECU... for as a retrofit to an AAZ it will be a factor.

Haven't driven one yet so don't know how obvious it will be... I'm usually paying attention to my tach during acceleration and slow deceleration anyway so I suspect I won't notice too much.

Small price to pay IMHO, however, vs a chewed up crankshaft ?! ;-)

Black Smokin' Diesel · « **Reply #13 on:** December 14, 2007, 06:05:28 pm »

Quote from: "Vincent Waldon"

Yup.

Not a problem on its native TDI since the tach signal comes from the ECU... for as a retrofit to an AAZ it will be a factor.

Haven't driven one yet so don't know how obvious it will be... I'm usually paying attention to my tach during acceleration and slow deceleration anyway so I suspect I won't notice too much.

Small price to pay IMHO, however, vs a chewed up crankshaft ?! ;-)

Yeah that's what I thought. You could switch to this setup. IMO it would be more precise (not worry about a slipping belt screwing the signal). And you can use any tach you want.

http://www.4crawler.com/Diesel/CheapTricks/Tachometer/index.shtml

bert · « **Reply #14 on:** December 15, 2007, 07:53:23 am »

My GTD has no tach :cry: so im ok,i noticed the bounce of the belt has gone too with the clutch pulley.
Bert