FAN DRIVE GROUP 4N4913 - Caterpillar

General Information
1. Turbochargers are very heavy. Use care when handling them. A large part of the turbocharger weight is contained in the turbine housing.2. In severe applications, it may be beneficial to tighten all gasketed surface joint fasteners again after the first full load cycle of the engine.3. Inspect the surfaces between the exhaust manifold and turbine housing and replace the gasket during service.4. Newer turbochargers have tighter clearances and thinner turbine blades. Be very careful when removing and installing the turbine housing.Small Or Medium Size Engine Turbochargers
1. If the turbocharger cartridge will not easily disassemble from the turbine housing with the turbocharger mounted on the engine, remove the turbocharger from the engine. See the Disassembly and Assembly Module in the Service Manual. Turbochargers with water cooled housings will normally disassemble easily.2. Install the turbocharger in 9S6363 Turbocharger Fixture Group or similar tool. See the illustration.
Illustration 1. Turbocharger installed on 9S6363 Turbocharger Fixture Group.3. If the turbine housing is stuck to the cartridge, use a two pound hammer to carefully tap around the housing in a radial direction. Continue to tap until a hollow sound can be detected.4. Then carefully tap around the housing in the axial direction to move the housing away from the cartridge in small increments.5. DO NOT attempt to use wedges to separate the turbine housing from the cartridge. The result could be a cartridge casting failure.6. Experience indicates penetrating compounds produce only questionable results when attempting to loosen a stuck turbine housings.3500 Engine Turbochargers
1. If the turbocharger cartridge will not easily disassemble from the turbine housing with the turbocharger mounted on the engine, remove the turbocharger from the engine. See the Disassembly and Assembly Module in the Service Manual. Turbochargers with water cooled housings will normally disassemble easily.2. After the turbocharger has been removed from the engine, attach a hoist to the compressor housing adapter. Use the hoist to lift the turbocharger slightly off the work bench or floor.3. Remove the bolts that fasten the turbine housing to the center housing (cartridge).4. Use a hammer to tap around the turbine housing to loosen it from the cartridge.5. If the turbine housing does not come loose, uniformly heat around the turbine housing and then tap it with a hammer to loosen it from the cartridge. Do NOT touch the housing until it has cooled.6. Before the turbocharger is assembled, it may be necessary to lap or machine the turbine housing where it mounts to the cartridge if the housing is out of round.7. A maximum of 0.05 mm (.002 in) can be removed from the "highs" on pilot diameters (D) of the turbine housings as follows: a. See Illustration 2 for turbine housing pilot diameter (D) on TV72, TW72, TV78, and TW78 Turbochargers.b. See Illustration 3 for turbine housing pilot diameter (D) on TV92 and TW92 Turbochargers.c. See Illustration 4 for turbine housing pilot diameter (D) on C151 Turbochargers.d. See Illustration 5 for turbine housing pilot diameter (D) on W153 Turbochargers.
Illustration 2. Location