941915 Volvo.Penta Spring washer

Engine Valve Lash
Check/Adjust
Initial valve lash adjustment on new, or rebuilt engines is recommended and should have been performed at the first normally scheduled oil change interval (250 Hours) due to initial wear and seating of valve train components. Subsequent adjustments should be made at every 3000 Hours. Set the valve lash clearance to the nominal value given in the Valve Lash Setting chart shown previously in this manual. Refer to the information in the Every 250 Hour maintenance and the Service Manual for the procedure. Turbochargers
If the engine is operated until the component(s) fails, it could cause additional damage to the engine. Damage to the turbocharger compressor wheel could cause parts from the compressor wheel to enter the engine cylinder and cause additional damage to the piston, valve and cylinder head.Inspect for Proper Operation
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.
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 the bearing clearance on the turbine wheel and shaft. Refer to the Service Manual for the procedure and specifications. If the measurements are not within specifications, the turbocharger must be repaired or replaced. See your Caterpillar dealer for repair or replacement options. To minimize downtime, Caterpillar recommends the use of a Remanufactured turbocharger. When installing or replacing V-band clamps, position the gap (tightening screw) down if possible so any accumulation of moisture (water condensation) will drain away. 7. Visually check for oil leaks after engine is started and during operation. Engine Mounts and Crankshaft Vibration Damper
Inspect/Check Engine Mounts
Caterpillar recommends inspecting the engine mounts for deterioration and proper bolt torque. This will prevent excessive engine vibration caused from deterioration and/or improper mounting. See the Engine Application and Installation Guide for more information.Inspect/Check Vibration Damper
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.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.Cooling System
Clean/Flush Coolant
Do not perform this maintenance until you read and understand the material in the Safety and Cooling System Specifications sections of this publication. Caterpillar does not recommend the use of cooling system solutions that are intended to stop leaks. Use of these products may result in excessive internal deposits that could reduce the engine's heat transfer characteristics as well as damage to the water pump seals.This procedure is to be used for normal maintenance of cooling systems surfaces to return to "like new" condition. For heavy build-up of scale and deposits, a severe acid-type, commercial cleaner or mechanical cleaning will be required.
Performing maintenance on the cooling system is important because the cooling system has a direct effect on the operation and service life of the engine. Improper maintenance can result in a variety of problems that could shorten the engine's service life, reduce the efficiency of the cooling system, result in poor engine performance, and in some cases, result in an increase in fuel consumption.Add Cooling System Cleaner
There are two types of cooling system cleaners available. One is the Standard-Type and the other is the Fast Acting-Type.The Standard-Type requires approximately 120 hours of engine operation to remove scale, lime and other debris. The Fast Acting-Type requires only 90 minutes of engine operation. Both types must remain in the system for a minimum of specified time to work properly, however, neither type will harm the engine if left in for a longer period of time.The Standard-Type must be added before the Every 3000 Hour maintenance interval. Add 1 liter (1 U.S. quart) of Caterpillar Cooling System Cleaner, Standard-Type, for every 15 liter (4 U.S. gallon) of cooling system capacity. Continue to operate the engine for the specified time before draining.The Fast Acting-Type may be added just prior to draining (such as the same day) and the system cleaned and flushed after operating for the specified time period. Follow the directions on the container.Drain
When you drain, clean, flush and replace the coolant, small particles, undesirable chemicals, scale and other deposit formations are removed. These deposits reduce the necessary heat transfer characteristics of the cooling system.Coolant water drain groups, installed in the jacket water pump and radiator may be available for draining engine coolant. Contact your Caterpillar dealer for assistance.With the engine shut down and cool, use the following procedure:1. Stop the engine and allow to cool. Disable the starting system and place DO NOT OPERATE tags on the START switch on the engine control panel. 2. Loosen the cooling system vent cap slowly to relieve pressure. 3. Drain the