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Engine Specific Info and Questions => IDI Engine => Topic started by: James8485 on December 11, 2007, 07:48:10 pm
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i have a 97 golf TD AAZ my crank doesnt wobble is this a good motor??
any thing i shou,d know about>
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That is a very little amount of info for expecting such a concrete response. do a compression test. that will help us help you ;)
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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.
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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
(http://i78.photobucket.com/albums/j95/citigolf_2006/Image002-2.jpg)
Bert
And its got a T3 on it :twisted:
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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)
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Got the T shirt :wink:
(http://i78.photobucket.com/albums/j95/citigolf_2006/ebayjune002.jpg)
one way pulley fitted 8)
Bert
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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.
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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.
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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 :P
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.
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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 !
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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:
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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 :P
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?
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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 ?! ;-)
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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
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My GTD has no tach :cry: so im ok,i noticed the bounce of the belt has gone too with the clutch pulley.
Bert
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With the tach being RPM driven, does this affect the reading?
The tach may fall a little slower when revving in neutral, as the alternator freewheels, but there is no difference when underway.
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can jsut any garage do a compresion test on it as the compression is so high??? also if someone has alterd fuel is there any way to get it back to stock without haveing to take it off the car and have it re-calibrated?
the last part is off topic but it was just on the top of my mind