Auto Service Professional

OCT 2018

Magazine for the auto service professional

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Page 53 of 69

52 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 age caused by pre-turbine exhaust gas or air/ boost leaks. Your first course of action should be checking all of the joints. If the noise continues, check the turbo clearances and wheels for hous- ing contact. If the turbocharger rotor assembly has seized up or is difficult to rotate, the problem is likely tied to the degradation of the lubricating oil. When the oil degrades, it can lead to carbon buildup in the bearing housing interior. e car- bon buildup will ultimately restrict rotation. Two other issues that can cause the rotor to seize up include insufficient or intermittent drop- in oil pressure and dirt in the lubricating oil. Another important detail to keep in mind is that a turbocharger has specific axial and radial rotor clearances. Sometimes, the clearances can be misdiagnosed as worn bearings. In reality, clearances that are out of specifi- cation may be associated with a lubricating oil issue. Check for insufficient oil, or oil contami- nated with dirt or coolant. To determine if the turbocharger has been damaged by foreign material, inspect the turbine wheel or impeller. You will clearly see any foreign material that has entered through the turbine or compressor housings. If the blades are damaged, charger issues in their shops. But there's already confusion in the field. To help technicians diagnose turbocharger repairs, here are a few important diagnostic and repair tips to keep in mind. As a note up-front, most turbocharger diagnoses (aside from noise and low power issues) require scan data and an understanding of operation at the technician level. What causes a turbocharger to malfunction? Before we start, let's highlight what causes a turbocharger to malfunction in the first place. Symptoms of a malfunctioning turbocharger include loss of power, excess smoke, high fuel consumption, overheating, high exhaust temper- ature, and oil leaks from the turbocharger. But it's important to note that defects in other com- ponents can produce the same symptoms. Before wrongly attributing the issues to the turbocharger, remember that turbocharger per- formance can only be impaired by mechanical damage or blockage caused by debris. Signs of a damaged turbocharger If you hear whistling noises coming from the turbocharger, it's likely due to an air/gas leak- Diesel pickup trucks are absolutely dependent on turbocharger performance assist in order to provide the customer's needs for towing applications. Whether single or twin turbocharger systems, the need for proper maintenance cannot be over-emphasized.

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