Auto Service Professional

OCT 2018

Magazine for the auto service professional

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Page 50 of 69

There's one company manufacturing all the aftermarket undercar par ts you need, from brands you trust. From the street to the fleet to the track, our par ts are built to fit, built to move. Y O U R N E X T M O V E ? Go to A P C a u t o t e c h . c o m to get the best brake and emissions control systems from the industry leader. Visit us at AAPEX Booth #4010 and SEMA Booth #24535. A P C A U T O T E C H . C O M Circle 121 on Reader Service Card O c t o b e r 2 018 A SP 49 bochargers or Garret's VNT (variable nozzle tur- bine) found in some production vehicles feature variable vane designs that eliminate the need for a separate wastegate. Any restrictions in the oil drain line will cause the oil to back up inside the turbocharger and be forced past the seals. e seals located at the compressor and turbine ends of the tur- bocharger keep pressurized air/exhaust gasses from entering the turbocharger and then into the crankcase. ey also control oil from entering the compressors. Oil leakage from the turbocharger seals can be caused by excess crankcase pressure due to poor crankcase ventilation such as a plugged PCV sys- tem or an open port from the intake manifold to the crankcase. Oil leaks past the seals can also be caused by excessive engine blow-by due to worn piston rings, valves, etc. Air filter restric- tions can contribute to excessive vacuum on the compressor end seal, causing oil to be drawn past the seals. Some turbochargers feature water cooling, which aids in heat transfer and reduction of oil coking, especially aer the engine shuts down. A water-cooled turbo should be mounted below

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