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Anyone Know Any Bad Info On the 1.9L TD AAZ motor(goodorbad)
by
James8485
on 11 Dec, 2007 19:48
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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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#1
by
vanagonturbo
on 11 Dec, 2007 21:03
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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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#2
by
jimfoo
on 12 Dec, 2007 07:12
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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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#3
by
bert
on 12 Dec, 2007 09:43
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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
Bert
And its got a T3 on it :twisted:
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#4
by
jtanguay
on 12 Dec, 2007 13:04
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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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#5
by
bert
on 12 Dec, 2007 14:12
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Got the T shirt :wink:
one way pulley fitted
Bert
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#6
by
Vincent Waldon
on 12 Dec, 2007 16:40
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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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#7
by
Black Smokin' Diesel
on 12 Dec, 2007 16:49
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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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#8
by
bert
on 13 Dec, 2007 00:05
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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
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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#9
by
Vincent Waldon
on 13 Dec, 2007 00:34
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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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#10
by
jimfoo
on 13 Dec, 2007 07:08
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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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#11
by
Black Smokin' Diesel
on 14 Dec, 2007 15:36
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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
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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#12
by
Vincent Waldon
on 14 Dec, 2007 16:46
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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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#13
by
Black Smokin' Diesel
on 14 Dec, 2007 18:05
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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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#14
by
bert
on 15 Dec, 2007 07:53
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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