Auto Service Professional

OCT 2018

Magazine for the auto service professional

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Page 47 of 69

46 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 rotating sha and journal bearings and serving to cool the turbo by helping to dissipate heat. Many consumers are under the assumption that operating the engine with dirty or contami- nated oil isn't an issue, since the engine's oil filter will capture any particles before they can enter the oil circuit. Wrong. Even the smallest particles can wreak havoc in the high-speed turbocharger by block- ing off internal oil passages. Starving a turbo- charger of oil, even momentarily, can result in a quick death to the unit. A turbocharged engine (gas or diesel) re- quires more frequent engine oil changes. A full- synthetic oil is generally considered the best choice. With regard to a production street vehicle that is factory turbo equipped, it's best to use the type of oil recommended by the vehicle maker. Properly lubricating the turbo is key to long turbo life. If supplied with clean oil and prevent- ed from ingesting debris, a turbo should last as long as the engine. When a turbo fails, it's gen- erally not the fault of the turbo, but a fault that affects the turbo. Don't ignore the intake air filters. Tiny par- ticles that enter the turbo can result in turbine wear. Air filter inspection and replacement in- tervals are more crucial for a turbo-equipped engine. Following a hot shutdown, heat soak begins. Heat in head, exhaust manifold and turbo hous- Wastegate valves must be kept clean and free of debris and coking buildup. A sticking valve can cause under- or over-boosting. Similar to the intake valves in a cylinder head, improper/insufficient valve seating is critical. The compressor wheel accepts outside air. The precaution should be obvious, but never place your fingers or any object near the compressor blades while the engine is running. The round compressed air charge port is shown at the top in this photo. This delivers the compressed air charge to the engine intake. The lower rectangular port seen here feeds from the exhaust stream.

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