12009 Mercruiser BUSHING

Engine
Steam Clean
Accumulated grease and oil on an engine is a fire hazard. Keep your engine clean. Remove debris and fluid spills each time a significant quantity accumulates on the engine.
Steam cleaning the engine is a recommended preventive maintenance practice because it provides for easy detection of fluid leaks. Repairing an oil or coolant leak upon detection may save money by avoiding major repairs that could result from low oil or coolant levels.Steam cleaning the engine as recommended will also improve the engine's heat transfer characteristics.Turbocharger
Turbocharger bearing failures can cause large quantities of oil to enter the air intake and exhaust systems. Loss of engine lubricant can result in serious engine damage.Minor leakage of a turbocharger housing under extended low idle operation will not cause problems as long as no turbocharger bearing failure occurred.When a turbocharger bearing failure is accompanied by a significant engine performance loss (exhaust smoke or engine speed up at no load), DO NOT continue engine operation until the turbocharger is repaired or replaced.
Inspect/Check
1. Remove the exhaust outlet piping and inlet piping from the turbocharger. Visually check for oil leaks.2. Turn the turbine and compressor wheel by hand.3. The assembly should turn freely.4. Inspect the turbine wheel and compressor wheel for contact with the turbocharger housing.5. There should NOT be any visible signs of contact between the turbine or compressor wheel and the turbocharger housing.Check the compressor wheel for cleanliness. If only the blade side of the wheel is dirty, dirt and/or moisture is passing through the air filtering system.If oil is found only on the back side of the wheel, it indicates a turbo oil seal leak. The leak may be the result of extended engine operation at low idle or an intake air line restriction (plugged filters).Maintain the compressor wheel/turbo housing by cleaning with standard shop solvents and a soft bristle brush.6. Check the end play and bearing clearance on the turbine wheel and shaft.If the measurements are not within specifications, the turbocharger must be repaired or replaced.7. When installing or replacing V-band clamps, position the gap (tightening screw) down if possible so any accumulation of moisture will drain away.Removal and Installation
For removal and installation, or repair/replacement options of turbochargers, see your Caterpillar dealer.Refer to the Service Manual for this engine or consult your Caterpillar dealer for the procedure and specifications.Crankshaft Vibration Damper
Inspect/Check
Damage to, or failure of, the damper will increase torsional vibrations and result in damage to the crankshaft and other engine components. A deteriorating vibration damper will cause excessive gear train noise at variable points in the speed range.Visconic Damper (If Equipped)
The vibration damper weight is located inside a fluid filled case. The weight moves in the case to limit torsional vibration. Inspect the dampers for evidence of dents, cracks or leaks of the fluid.Rubber Damper (If Equipped)
The vibration damper can have a visual wobble (movement to the front and rear when in rotation) on the outer ring. This does not mean a replacement is necessary since some wobble of the outer ring is normal. To see if the amount of wobble is acceptable, or replacement is necessary, check the damper with the procedure in the Testing and Adjusting section of the Service Manual.The vibration damper has marks on the hub (1) and ring (2). These marks will indicate the condition of the vibration damper. If the marks are not in alignment, the rubber seal (3) between the ring and the hub has separated from the ring and/or hub. If the marks are not in alignment, install a new vibration damper. Refer to the Service Manual for the necessary replacement procedure.Air Compressor
Inspect/Check
Do not disconnect the air line from the air compressor governor without purging the air brake and auxiliary air systems.Failure to purge the air brake and auxiliary air systems before removing the air compressor could cause personal injury.
Inspect the air compressor as instructed by the OEM truck manufacturers' instructions or for more information on how to check your air compressor, refer to the Service Manual for this engine.If you decide to inspect your air compressor, be sure to observe the following actions. Visually check for fluid leaks and listen for air leaks. Release the air pressure in the air tank until the air pressure is zero. Remove discharge fittings and inspect compressor discharge port and discharge line for excessive carbon deposits. The discharge line must be cleaned or replaced and the compressor checked more thoroughly if there is excessive carbon build-up in either the discharge line or compressor discharge port.For more information on how to check your air compressor, refer to the OEM truck manufacturer's instructions or engine Service Manual.Engine Valve Lash
The procedures for engine valve lash should be performed according to the information in the Service Manual.
Check/Adjust
Be sure the engine cannot be started while this maintenance is being performed. To prevent possible injury, do not use the starting motor to turn the flywheel.Hot engine components can cause burns. Allow additional time for the engine to cool before measuring/adjusting valve lash.
Adjust the valve lash to the setting given in the chart above.Refer to the Service Manual or your Caterpillar dealer for the complete valve adjustment procedure.Bridge Adjustment
The valve bridge should be checked and/or adjusted each time valve lash is checked and/or adjusted. Valve and valve mechanism components do not always wear evenly which can allow the bridge to be out of adjustment.It is not necessary to remove the