Did the turbo cause engine bottom end to fail

2011 HYUNDAI
103,000 MILES • 2.5L • TURBO • MANUAL
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MRSMC
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Hi,
My car model is i800 turbo. I had a new turbo fitted six weeks ago and it is gone bang, but the garage are saying the turbo has caused the bottom end of the engine to fail as oil and diesel has mixed. is this correct, they are saying I need a new bottom end at the cost of £2500?
Apr 11, 2017 at 12:18 AM
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STEVE W.
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Could very well be correct. Diesel fuel is not a very good lubricant. Diesel engines already beat the bearings pretty good so if the lubrication was reduced it would quickly do damage.

All engines have some blow-by (unburnt fuel vapor and combustion gasses) that gets through the piston rings. Diesels generally have a bit more because of the higher pressures in the cylinders. Now if the engine is worn to begin with (103,000 is worn) and you do something that increases the cylinder pressures, like replacing a worn/damaged turbo with a new one that generates full boost, you will get more blow-by and more fuel and soot in the oil. That is because the worn pistons and rings cannot stop it.
Also, at that mileage the bearings themselves will be worn. All of the wear adds up. One spirited run through the gears could be the last straw it needs to fail.

You would not have much to lose getting a second opinion from another shop.
Apr 11, 2017 at 4:23 PM