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Fire coming out of diesels
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There is good reason why Randy has never seen a stack fire caused by a lube oil seal failure in a turbo charger. <br /> <br />Generaly, what causes lube oil seal failure in a turbo charger is excess oil pressure in the turbo charger. Turbo charger lube oil is fed to the turbo shaft bearings from a pressurized line. This oil then drains by gravity to the crank case. <br /> <br />Excess pressure in the turbo shaft bearings can be caused by a blocked drain, but this is uncommon. <br /> <br />When looking for the source of a problem always eliminate the most simple causes first. <br /> <br />While turbo charger lube oil seal failure can cause heavy smoking, chances are much greater to be simply be dirty air filters or crank case breather. <br /> <br />Excess crank case pressure can cause lube oil to back up into the turbo charger. This excess pressure could be caused by malfunctioning breather, or excessive blow-by from worn rings. <br /> <br />At any rate, excessive oil leakage from a turbo charger is a symptom of other problems. <br /> <br />Blow-by is higher during idling because rings are designed to seal using gas pressure from the cylinder above the piston. Chronic long periods of idling cause cylinder walls to varnish, further increasing blow by. <br /> <br />Excessive crank case pressure will also cause valve guides to weap.
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