SHAFT 8M0056 - Caterpillar

Table 1
Engine Performance
Operator Date
Engine serial number Hour meter
Load RPM
Coolant temperature Oil pressure
Oil filter
differential pressure Air filter
differential pressure
Inlet
manifold pressure Inlet
manifold temperature
Exhaust
temperatures Exhaust
pressure
Secondary transformer voltages Exhaust emissions
Throttle position Fuel valve position Investigate any significant change in the gauge or in the Cat ET readings. Monitor the engine operation and take the necessary action when discrepancies are found.Operating the Engine
Check the gauges while the engine is operating under a load. The engine can be operated continuously at full load.Partial Load Operation
Extended operation at low idle or at a reduced load will cause increased oil consumption and carbon buildup in the cylinders. Carbon buildup results in the following effects:
Narrow margin for detonation
Power loss
Poor performance
Accelerated wear of componentsCaterpillar Engines can be operated at light loads for limited times with no harmful effects. Table 2 lists the limits for hours of operation at various loads.After the time limit for reduced load operation has expired, operate the engine for a minimum of 2 hours. Operate the engine at a load that is more than 70 percent of the rated load.For example, an engine is operating at 20 percent of the rated load. The engine may be operated at this load factor for a maximum of one-half hour. After the one-half hour, operate this engine for at least 2 hours at a load factor of more than 70 percent.To help keep engine maintenance at a minimum, follow the guidelines that are listed in Table 2.
Table 2
Time Limits For Low Load Operation
Engine Load Time Limit
0 to 30 percent 1/2 hour
31 to 50 percent 2 hours
51 to 100 percent Continuous (1)
(1) For continuous operation, the manifold air pressure must be greater than the atmospheric pressure.