RING-LOCK 1K6992 - Caterpillar

Operation
TURBOCHARGER SECTION 1 Thrust ring.2 Thrust bearing.3 Compressor cover.4 Thrust ring.5 Spacer.6 Clamps.7 Shaft.8 Nozzle.9 Turbine back plate.10 Lock rings (three).11 Sleeve.12 Turbine housing.13 Shims.14 Nut.15 Compressor impeller.16 Turbine wheel.17 Ring seals (two).18 Ring seals (two).19 Spacer.20 Retaining ring.21 Seal.22 Insert.23 Oil deflector.24 Bearing housing.25 Vent tube.26 Oil drain hole.27 Bearings (two).28 Sleeve.29 Oil slinger.The turbocharger is designed to increase diesel engine power output. The turbocharger utilizes diesel exhaust gases to drive the compressor impeller (15) for supercharging the diesel engine.Turbine wheel (16) is located in the turbine housing and is permanently secured to one end of shaft (7). The impeller is secured to the other end of the shaft by nut (14) to form an integral rotating assembly. To assure reliability and freedom from vibration, all parts of the rotating assembly have been carefully, dynamically balanced. The compressor impeller can be replaced separately.Vent tube (25) vents the oil cavity to the crankcase. Venting this cavity promotes draining of oil from the bearing housing, and therefore away from the seals, thus reducing the work-load imposed on the seals.The rotating assembly is supported by two full-floating, pressure-lubricated bearings (27). Filtered engine oil is supplied through passages in the housing to lubricate the shaft bearings (27) and thrust bearing (2). This oil aids in removal of excessive heat. Oil returns from the turbocharger to the crankcase through an external tube at (26). Thrust loads are absorbed by stationary thrust bearing (2) and rotating thrust rings (1) and (4). Oil deflector (23) routes the oil, thrown from the shaft and thrust rings, back to drain opening (26).Ring seals (17) and (18) on either end of the shaft prevent oil from escaping the bearing housing.Beside housing the turbine wheel, the turbine housing acts as a chamber for exhaust gases from the diesel engine. Gases are directed through the turbine housing into contact with the turbine blades by the nozzle (8).Shims (13), located between impeller (15) and sleeve (11), adjust the impeller-to-cover clearance.Always handle the turbocharger carefully to avoid damage to any of its components.Altitude Operation
Maximum turbocharger speed is determined by the rack setting, the high idle speed setting and the altitude at which the engine is operated. The rack setting has been set to permit the engine to be operated at the altitude given on the warning plate on the instrument panel or valve cover. The high idle speed setting is not the same for all altitudes. If the high idle speed or the rack setting is greater than specified for the altitude at which the engine is operated, serious damage to engine or turbocharger parts can result.The maximum altitude at which the engine can be operated is specified on the altitude warning plate located on the valve cover or instrument panel. The governor housing and turbocharger are sealed to prevent serious engine damage due to operation of the engine with incorrect settings or turbocharger nozzle. Changes to the turbocharger, rack setting, or high idle speed should be made only by a