0912089 EVINRUDE SUPPORT, Tube to spool valve housing

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 standard displacement engines. These tables are based on a load factor of approximately 60 percent.
Overhaul intervals are guidelines and are dependent on the maintenance and usage factors described in this Operation and Maintenance Manual.
Maintenance intervals must be reduced for engines that operate in a severe service application. Maintenance intervals must also be reduced for engines that operate in excess of the engine rating definition.
Table 1
Maintenance Interval Schedule
Service Hours (SH) and Fuel Consumption for 3516 Engines (1)    
RPM     1600     1800    
Rating     A     B     C     B     C    
250 Service Hours    
63100 L (16670 US gal)    
663200 L (17520 US gal)    
70980 L (18750 US gal)    
83750 L (22125 US gal)    
88010 L (23250 US gal)    
500 Service Hours    
126220 L (33345 US gal)    
133780 L (35340 US gal)    
141950 L (37500 US gal)    
167500 L (44250 US gal)    
176020 L (46500 US gal)    
1000 Service Hours    
252450 L (66690 US gal)    
265280 L (70080 US gal)    
283900 L (75000 US gal)    
335000 L (88500 US gal)    
352040 L (93000 US gal)    
2000 Service Hours    
504900 L (133380 US gal)    
530560 L (140160 US gal)    
567810 L (150000 US gal)    
670020 L (177000 US gal)    
704090 L (186000 US gal)    
3000 Service Hours    
757350 L (200070 US gal)    
795840 L (210240 US gal)    
851720 L (225000 US gal)    
1005030 L (265500 US gal)    
1056130 L (279000 US gal)    
6000 Service Hours    
1514690 L (400140 US gal)    
1591690 L (420480 US gal)    
1703430 L (450000 US gal)    
2010050 L (531000 US gal)    
2112260 L (558000 US gal)    
Top End Overhaul (SH)     9000 SH     7500 SH    
Top End Overhaul (Fuel)    
2272040 L (600210 US gal)    
2387530 L (630720 US gal)    
2555150 L (675000 US gal)    
2512570 L (663750 US gal)    
2640320 L (697500 US gal)    
Major Overhaul (SH)     18000 SH     15000 SH    
Major Overhaul (Fuel)    
4544100 L (1200420 US gal)    
4775100 L (1261440 US gal)    
5110300 L (1350000 US gal)    
5025100 L (1327500 US gal)    
5280600 L (1395000 US gal)    
( 1 ) Fuel consumption is based on a load factor of approximately 60 percent.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 the oil consumption of an engine has risen to three times the original oil consumption rate, 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, all of the factors which can contribute to severe operation cannot be identified. Consult your Cat dealer about the maintenance that is needed for your specific engine.The following f