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Using Fuel Consumption For Calculating the Overhaul Intervals
Experience has shown that maintenance intervals are most accurately based on fuel consumption. Fuel consumption corresponds more accurately to the engine load. Table 1 lists average ranges of fuel consumption and service hours for the C175 engine. These tables are based on a load factor of approximately 60 percent.Standard Displacement Engines
Table 1
Maintenance Interval Schedule
Service Hours and Fuel Consumption for the C175-16 Marine Engine
Interval Fuel Consumption(1)
250 Service Hours 132489 L (35000 US gal)
500 Service Hours 264978 L (70000 US gal)
1000 Service Hours 529957 L (140000 US gal)
2000 Service Hours 1059915 L (280000 US gal)
3000 Service Hours 1589872 L (420000 US gal)
6000 Service Hours 3179744 L (840000 US gal)
Top End Overhaul (M6A) 1800 RPM 12000 Service Hours
4353222 L (1150000 US gal)
Top End Overhaul (M6B) 1600 RPM 12000 Service Hours
3785410 L (1000000 US gal)
Major Overhaul (M6A) 1800 RPM 24000 Service Hours
8706444 L (2300242 US gal)
Major Overhaul (M6B) 1600 RPM 24000 Service Hours
7570820 L (2000000 US gal)
(1) Fuel consumption based on a load factor of approximately 60 percent.
For engines that operate at less than 50 percent load, use the 50 percent load fuel consumption rate. This consumption rate will determine the first top end and the overhaul intervals.
Maintenance intervals must be reduced for engines that operate in severe service applications. Also for engines that operate in excess of the engine rating definition.Oil Consumption as an Overhaul Indicator
Oil consumption, fuel consumption, and maintenance information can be used to estimate the total operating cost for your Cat engine. Oil consumption can also be used to estimate the required capacity of a makeup oil tank that is suitable for the maintenance intervals.Oil consumption is in proportion to the percentage of the rated engine load. As the percentage of the engine load is increased, the amount of oil that is consumed per hour also increases.The oil consumption rate (brake-specific oil consumption) is measured in grams per kW/h (lb per bhp). The brake-specific oil consumption (BSOC) depends on the engine load. Consult your Cat dealer for assistance in determining the typical oil consumption rate for your engine.When an engine oil consumption has risen to three times the original oil consumption rate due to normal wear, an engine overhaul should be scheduled. There may be a corresponding increase in blowby and a slight increase in fuel consumption.Severe Operation
Severe operation is the use of an engine that exceeds current published standards for that engine. Caterpillar maintains standards for the following engine parameters:
Horsepower
Range of rpm
Fuel consumption
Fuel quality
Altitude
Maintenance intervals
Selection of oil
Selection of coolant
Environmental qualities
InstallationRefer to the standards for your engine or consult your Cat dealer in order to determine if your engine is operating within the defined parameters.Severe operation can accelerate component wear. Engines that are operating under severe conditions may need more frequent maintenance intervals for the following reasons:
Maximum reliability
Retention of full service lifeBecause of individual applications, identify all of the factors which can contribute to severe operation is not possible. Consult your Cat dealer about the maintenance that is needed for your specific engine.The following factors can contribute to severe operation: environment, improper operating procedures and improper maintenance practices.Environmental Factors
Extreme Ambient Temperatures
Extended operation in environments that are cold or hot can damage components. Valve components can be damaged by carbon buildup if the engine is frequently started and stopped in cold temperatures. Hot inlet air reduces the performance capabilities of the engine.Note: See this Operation and Maintenance Manual, "Cold Weather Operation" topic (Operation Section), or see Supplement, SEBU5898, "Cold Weather Recommendations".Cleanliness
Unless the equipment is cleaned regularly, extended operation in a dirty environment and in a dusty environment can damage components. Built up mud, dirt, and dust can encase components. This condition can make maintenance difficult. The buildup can contain corrosive chemicals. Corrosive chemicals and salt can damage some components.Improper Operating Procedures
Extended operation at low idle
Minimum cool down periods after high load factor operation
Operating the engine beyond the guidelines for the engine rating
Operating the engine at loads that are greater than the rated load
Operating the engine at speeds that are greater than the rated speed
Use of the engine for an application that is not approvedImproper Maintenance Practices
Extension of maintenance intervals
Not using recommended fuel, lubricants, and coolant