Re: PatPrice.....So what's the cause of these blown turbos? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: PatPrice.....So what's the cause of these blown turbos?
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Posted by patprice (more from patprice) on Fri, 16 Jan 2004 01:15:11 Share Post by Email
In Reply to: PatPrice.....So what's the cause of these blown turbos?, DouglasKeith, Tue, 13 Jan 2004 20:32:15
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Turbochargers fail for several reasons the most common is dirty oil. The bearing in a turbo charger are nothing more that bronze sleeves with several holes drilled in them for oil to be pumped into them at high volume(The turbo shaft actually floats on a cushion of oil and rarely comes into contact with the bearings,think air hockey).
The inside of a turbocharger center section is in extremely close proximity to the exhaust system and the shaft of the exhaust driven fan(turbine) that drives the intake fan(compressor) actually passes through the center section of the turbo. All this makes for really hot surfaces inside the turbo. What happens is when the oil passes through these areas some of it will actually burn off and any dirt or carbon in the oil will be left behind(think of a frying pan, pour in clean water and what is left in the pan after the water boils off is a clean pan, now throw in dirty water) Eventually the deposits(coke) obscure the oil passages in the turbo(think blocked arteries) and one of two things happen, if the blockage is upstream of the bearings the turbo bearings are destroyed. If it is downstream the oil has nowhere to go and it is forced under pressure out into the exhaust system(think clogged gutter).
One of the reasons that I am a huge fan of synthetic oil in turbocharged engines is that the boil-off temperature is higher so your chances of clogging a turbocharger are much lower.
Allowing a turbocharger even a few seconds to cool down and slow down before shutting your car off also goes a long way toward warding off a $2000 repair.

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