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Adjustment of the fuel system outside Caterpillar specified limits will not improve fuel efficiency and could result in damage to the engine.
If you feel you have a vehicle performance problem, first consider the impact of vehicle efficiency and operating characteristics (vehicle speed, design, etc.), on power demand before questioning engine performance.In the case of poor fuel economy, the engine is not likely to be the cause without the presence of excessive exhaust smoke and/or a significant loss of power.If you feel you have a valid engine performance problem, contact an authorized Caterpillar dealer for assistance. If your engine is under warranty, then the Caterpillar warranty or extended service coverage (if purchased) will cover the cost of resolving a valid engine performance deficiency. Refer to the Warranty Section in this publication and your Caterpillar dealer for details.However, if the engine is not found at fault, all costs incurred will be the responsibility of the owner.Performance Analysis Report (PAR)
PAR complements a good preventive maintenance program. PAR analysis can monitor the condition of your engine and to determine if your engine is operating at peak efficiency.PAR reflects the results of various tests normally conducted by your Caterpillar dealer for the purpose of:* confirming your engine is operating efficiently and within specification.* identifying potential problems.* determining components or systems that should be adjusted, replaced, etc.Approximately eighty to 85% of your truck engine's total operation and maintenance cost is the cost of fuel. Therefore, substantial cost reductions can be achieved by keeping your engine operating at peak efficiency. Fuel consumption and performance of your engine is affected by vehicle specifications, how it is operated and condition of the engine. Each plays an important part in minimizing your total owner and operating cost.Do not attempt to use PAR until the first engine oil change. This allows for sufficient break-in of the engine, drive train and tires. Fuel rate and turbocharger boost will be measured under load at five engine speeds and compared to factory specifications. Fuel rate and boost are the primary indicators of your engine's performance and the analysis of this data will help pinpoint potential problems faster.Wheel horsepower (kW) will also be recorded during the initial PAR test to establish your truck's exact wheel horsepower (kW) over its full operating range. This power can then be compared to the power of subsequent PAR tests. Power available at the wheels is not only the result of the condition of the engine, but also the transmission, drive axle(s), brakes, tires and engine drive accessories.Consult your Caterpillar dealer for complete information and assistance in establishing a PAR program for your engine.Refer to Form LEDT4211, PEDP0026 and/or Performance Troubleshooting Manual, Form SENR4249 or your Caterpillar dealer for more information on PAR.Contact your nearest Caterpillar dealer for information on PAR and the location of the nearest, approved dynamometer.