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bad turbo experience
Have you ever experience bad thing from a turbo due to the heat or oil. I know that approximately 40% of all turbocharger failures are oil-related. Contaminated or dirty oil leads to bearing scratching and scoring which cause excessive bearing wear and premature bearing failure. Another oil-related turbocharger failure is lack of lubrication.
Lack of lubrication results not only from low oil pressure, but also from kinks and/or clogs in the oil inlet line. Occasionally, gasket sealant used between the oil inlet hose and the bearing housing seeps and clogs the oil passages.
Another cause of turbocharger failures is inlet restrictions from plugged air cleaners, collapsing hose connections or undersized air pipes. These restrictions reduce the air supply to the turbo and ultimately to the engine resulting in excessive exhaust temperatures leading to turbine housing cracking and scaling or even turbine wheel failures.
Inlet restrictions also can produce a vacuum inside the compressor. This can cause over speed conditions in the turbo which can lead to premature bearing failure or even make a compressor wheel burst. This vacuum inside the compressor also can cause oil leakage into the compressor.
Prolonged engine idling also can cause turbocharger oil seal failure, this time on the turbine side. Continued idling causes the turbo to rotate without producing boost. Consequently, a vacuum condition on the turbine side tries to "pull" oil past the turbine-side oil seal and into the turbine housing.
Over-fueling also can lead to premature turbo failure by producing excessive exhaust temperatures which can cause turbine housing scaling and cracking. As the turbine housing continues to deteriorate from the excessive heat, pieces of the housing can crack off and cause turbine wheel failure.
Hot engine shutdown also can lead to turbocharger oil leakage by causing the oil to coke up inside the oil drain and forcing the oil out the turbine and compressor seals. A clogged or collapsed oil outlet hose also can cause oil to leak.
Another common cause of turbo failures is foreign object damage to either the compressor or turbine wheels. A rapidly rotating wheel quickly disintegrates when a foreign body tries to pass through the wheel's blades. This type of turbine wheel damage is the result of pieces of burned or broken valves and combustion cups passing through the exhaust system. Other turbine damage is due to casting flash that may break out of the manifolds and ports.
Occasionally improperly installed gaskets will allow pieces of the gasket to overhang a port and break off into the exhaust system. Damage caused by nuts and washers that are dropped into the exhaust system is also very frequent. Scuffed and broken pistons often find their way out of the engine and into the turbocharger turbine wheel.
Compressor wheel breakage also can occur from foreign object material although not as frequently as turbine wheel damage. Sometimes pieces of the air cleaner will break loose and go through the compressor. There also have been instances where hose connections fail and pieces of rubber or wire reinforcing from the hose get into the compressor wheel. Again, carelessness in allowing nuts, bolts, washers, rocks, rags and even screwdrivers to get into the intake systems will cause compressor wheel failures
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