Figure 5a. - Foreign Material Turbo Damage

Figure 4. - Turbocharger Properly Capped

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL TURBOCHARGERS Section 1 CLEANING, INSPECTION & REPAIR CLEANING Clean the Turbocharger and Related Components as Follows: 1. Thoroughly clean the piping connecting the air cleaner to the Turbocharger. 2. Remove the air cleaner and clean inside the air cleaner element housing. (Important to prevent repeat Turbocharger or engine failures). 3. In the event of a Turbocharger failure, REPLACE the OLD AIR CLEANER ELEMENT with a NEW AIR CLEANER ELEMENT, because foreign material and/or compressor wheel particles may be embeded in the air cleaner element. NOTE: If the air cleaner element is not changed, the foreign material end/or particles may be drawn Into the turbocharger compressor wheel when the engine Is restarted. 4. Clean the exhaust elbow and manifold, thoroughly. NOTE: Use Bendix Metal Cleaner or Gunk Hydroseal to clean components. DO NOT use a caustic solution. 5. In case of Turbocharger failure or damage to the wheel assembly, plug the Turbocharger oil Inlet tube and operate the engine without the Turbocharger installed to blowout any foreign material In the engine or manifold. INSPECTION Inspect the Assembled Turbocharger as Follows: 1. Visually Inspect the compressor and turbine wheels for damaged blades or evidence of wheel contact with compressor or turbine housings. (see Fig. a & b). Figure 5a. - Foreign Material Turbo Damage NOTE: View of the turbocharger compressor wheel which has been damaged by foreign material from the air Inlet system. Hard dense foreign material such as capscrews or nuts will damage the leading edges of the compressor wheel. Soft foreign material such as shop rags will bend the compressor blades backward. Figure 5b. - Bearing Failure Resulting in Compressor Wheel Damage NOTE: View of turbocharger compressor wheel damaged due to failed bearings. The compressor wheel blades made contact with the compressor housing wail after bearing failure. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 6

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