Auto Service Professional

OCT 2018

Magazine for the auto service professional

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54 A S P O c t o b e r 2 018 T u r b o S e r v i c e T i p s Probable cause: e crankcase ventilation is clogged Type of failure: Blue smoke; high oil consump- tion; compressor oil leak; turbine oil leak Probable cause: Coke and sludge in turbo center housing Type of failure: Blue smoke; high oil consump- tion; compressor/turbine oil leak Probable cause: Fuel system feed defective or misadjusted Type of failure: Low power, low boost; boost pressure too high; black smoke Probable cause: Valve guide, piston rings worn cylinder liners worn/excessive blow-by Type of failure: Poor power, low boost; black or blue smoke; high oil consumption; compres- sor/turbine oil leak Probable cause: Dirty compressor or charge air cooler Type of failure: Low power, low boost; black or blue smoke; turbo acoustic noise; high oil con- sumption; compressor oil leak Probable cause: Boost pressure control swing valve/poppet valve does not close Type of failure: Poor power/low boost pres- sure; black smoke Probable cause: Boost pressure control swing valve/poppet valve does not open Type of failure: Boost pressure too high Probable cause: Pipe assembly to swing valve/ poppet valve defective Type of failure: Poor power/boost pressure low; boost pressure too high Probable cause: A defective piston ring seal- ing Type of failure: Blue smoke; high oil consump- tion; compressor/turbine oil leak Probable cause: Turbo bearing damage Type of failure: Defective compressor/turbine wheel; low power, low boost pressure; black or blue smoke; turbo acoustic noise; compressor and/or turbine oil leak Probable cause: Foreign body damage on compressor or turbine Type of failure: Defective compressor/turbine wheel; low power, low boost; black smoke; turbo acoustic noise Probable cause: Exhaust gas leaks between turbine outlet and exhaust pipe Type of failure: Turbo acoustic noise Probable cause: Engine air collector cracked, missing or loose gaskets Type of failure: Low power, low boost pres- sure; black smoke; turbo acoustic noise Probable cause: Turbine housing/flap dam- aged Type of failure: Low power/low boost pres- sure; compressor/turbine wheel defective; black smoke; turbo acoustic noise Probable cause: Insufficient oil supply to tur- bocharger Type of failure: Defective compressor/turbine wheel; poor power/low boost pressure; black smoke; turbo acoustic noise NOTE: Gas and diesel engine turbo systems usu- ally feature a "swirl flap" located in the intake manifold to improve mixing of the air/fuel mix- ture. e swirl flap allows air movement to adapt to the engine load and speed. Depending on the specific design, the flap may be operated electrical- ly or pneumatically. ese flaps should be checked for smooth operation and for looseness. ey are prone to coking in diesel systems. New or reman Turbochargers, depending on make/model/year, may be available new or remanufactured. Natu- rally, a reman unit (generally requiring a core re- turn) will be less expensive, saving the customer some cash. Some of the firms that offer new or remanufactured units include: • Cardone Industries (www.cardone.com) • Honeywell Garrett (www.turbo.honeywell.com) • BorgWarner Turbo Systems (www.turbos. borgwarner.com) • Standard Motor Products Inc. (www.standard- brand.com) ■

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