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Old February 19th, 2009, 14:07   #1
sisyphus
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Default How often do turbos destroy engines?

Why does it seem like every so often we see a thread about someone driving along minding their own business and all of a sudden the engine runs away and the poor guy now has a scrap car? Is this unique to VW's? Is this what we all have to look forward to?
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Old February 19th, 2009, 14:21   #2
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it's not unique to VW's.. it can and does happen with any turbodiesel..

If you get the engine shut down before it revs to 7k or runs out of oil, it's usually fine..

Both of my tdis did it within 48 hours of each other.. Go figure.. one had 221k on the factory turbo and it was chipped since 140k... the other I haven't put a turbo on yet but the engine survived..


A bad engine is no reason to scrap a car.... Unless it's a $500 car to start with..
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Old February 19th, 2009, 14:23   #3
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Quote:
Originally Posted by TDIJetta99


A bad engine is no reason to scrap a car.... Unless it's a $500 car to start with..

...or it's fitted with an 01M
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Old February 19th, 2009, 14:25   #4
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I have AlanTDI's wagon here with a hole in the block and a BRAND NEW 01M that was installed recently..
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Old February 19th, 2009, 14:34   #5
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Quote:
Originally Posted by TDIJetta99
I have AlanTDI's wagon here with a hole in the block and a BRAND NEW 01M that was installed recently..
How much do you want for that AG4 transmission?
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Old February 19th, 2009, 14:37   #6
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Alan's gonna be a sad fellow tonight
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Old February 19th, 2009, 14:54   #7
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Quote:
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How much do you want for that AG4 transmission?
umm... trans isn't for sale.. I'm looking for an engine to fix the car..

Alan already knows the damage..
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Old February 19th, 2009, 15:41   #8
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It's probably a LOT more common on Detroits than VW's. wasn't there a thread here a while back discussing how to stop a runaway?
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Old February 19th, 2009, 16:12   #9
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it's tough with an auto, even with a functioning ASV... 5-speeds are easy, 5th gear, let go of clutch, stand on brakes..
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Old February 19th, 2009, 16:21   #10
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Quote:
Originally Posted by FL2AK-tdi
It's probably a LOT more common on Detroits than VW's. wasn't there a thread here a while back discussing how to stop a runaway?
Detroits just SOUND like they are running away.
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Old February 20th, 2009, 05:38   #11
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It's not the turbochargers. Naturally aspirated diesels can also suffer "run-away" as worn rings or bad valve guides let crankcase oil be a "fuel" as the lubricating oil gets ingested into the combustion chamber. It would be just as correct to ask "Why do engines destroy turbos?"
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Old February 20th, 2009, 07:19   #12
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while a runaway in an NA diesel is possible and does happen, it's not as sudden and abrupt as a turbocharger failure in a TD.. An NA diesel that runs away has had low compression for a LONG time and has probably given symptoms of such for a while, like hard starts, excessive smoke, oil consumption, etc..

We all know a TDI that runs away will be running perfectly, then suddenly BANG! off we go... no warning, nothing.. just smoke, and rpm's..
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Old February 20th, 2009, 10:54   #13
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One way to avoid turbo failure is idle the car for some seconds before shutting off. Turbo spins at very high revolutions and if shut down abruptly (without idlying or slowing), oil flow is intruppted. Without oil that cools and lubricate moving parts, the turbo remain hot, and heat warps metals, and thereby bringing their demise. The same rule applies when you start to move. After starting, idle for few seconds and then pull of gently to the freeway speed. You do not have to put stress on turbo by flooring the pedal. Flooring effect is same as that of an impulse. The key rule is "keep gentle". However, if you are cruzing at 70 mph and hear weired noises, slow down, idle the car, open, hood or bonnet, investigate the noise area, and then shut down. There will be turbo failures when they are exposed to high temperatures, vibrations, and foot stress of the driver. Also it is prudent to clean the turbo vanes periodically. There is instruction for this on this forum somewhere. If you wish to emove the turbo problem forever, all you need to do is remove the turbo and seal to cavatues, making sure that there is passage for the exhaust to reach tail pipe. You will now have a not-turbo diesel that will be a little sluggist than before, pick-up time for 0-60 mph increased from 8 sec to 12-14sec.

Last edited by Dodoma; February 20th, 2009 at 11:02.
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Old February 20th, 2009, 11:17   #14
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Turbochargers on these engines rarely (if ever) fail from heat stress. The EGTs experienced by a diesel are anywhere from 500-1000*F lower than from a similar gasoline fired engine.

Add to that using a good quality synthetic oil, and you just don't find a good reason to blame problems on heat.

You will notice that water cooling passages are not found on the turbochargers on these cars. A water cooled body is available, why would it not be included if needed? VW has never been shy on adding excess plumbing either... hmmm... must be because... it is not necessary.

Oh, and unlike prime time Japanese TV commercials, double posting isn't really necessary, Dodoma.
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Old February 20th, 2009, 11:49   #15
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Quote:
Originally Posted by Dodoma
If you wish to emove the turbo problem forever, all you need to do is remove the turbo and seal to cavatues, making sure that there is passage for the exhaust to reach tail pipe. You will now have a not-turbo diesel that will be a little sluggist than before, pick-up time for 0-60 mph increased from 8 sec to 12-14sec.
Hahahaha.. I actually drove my other tdi with the turbo removed and an 8v gasser exhaust manifold temporarily in its place. I needed to get it home and had no other way at the time. The car would barely even get itself up to 55mph, let alone accelerate with any authority..

I can't complain.. My factory turbo lasted 221k with me beating the crap out of the car since 120k.. chipped, injectored, and towing other cars since 140k..
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