RING-PISTON 6N1526 - Caterpillar

Overhaul Intervals
Some factors that are important for determining the overhaul intervals include the following considerations:
Performance of preventive maintenance
Use of recommended lubricants
Use of recommended coolants
Use of recommended fuels
Proper installation
Operating conditions
Operation within acceptable limits
Engine load
Engine speedGenerally, engines that are operated at a reduced load and/or speed achieve more service life before an overhaul. However, this is for engines that are properly operated and maintained.Other factors must also be considered for determining a major overhaul:
The total amount of fuel consumption
The service hours of the engine
An increase of oil consumption
An increase of crankcase blowby
The wear metal analysis of the lube oil
An increase in the levels of noise and vibrationAn increase of wear metals in the lube oil indicates that the bearings and the surfaces that wear may need to be serviced. An increase in the levels of noise and vibration indicates that rotating parts require service.Note: It is possible for oil analysis to indicate a decrease of wear metals in the lube oil. The cylinder liners may be worn so that polishing of the bore occurs. Also, the increased use of lube oil will dilute the wear metals.Monitor the engine as the engine accumulates service hours. Consult your Caterpillar dealer about scheduling a major overhaul.Note: The driven equipment may also require service when the engine is overhauled. Refer to the literature that is provided by the OEM of the driven equipment.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. Tables 1, 2, and 3 list average ranges of fuel consumption and service hours for standard displacement engines. Tables 4 and 5 list average ranges of fuel consumption and service hours for high displacement engines. These tables are based on a load factor of approximately 60 percent.Standard Displacement Engines
Table 1
Service Hours and Fuel Consumption for 3508B Engines(1)
Interval Rated up to 1300 RPM Rated 1301 to 1600 RPM Rated 1601 to 1800 RPM
250 Service Hours 22700 L (6000 US gal) 27200 L (7200 US gal) of fuel 32000 L (8500 US gal) of fuel
500 Service Hours 45400 L (12000 US gal) 54400 L (14400 US gal) of fuel 64000 L (17000 US gal) of fuel
1000 Service Hours 89000 L (23500 US gal) 109000 L (28800 US gal) of fuel 128500 L (34000 US gal) of fuel
2000 Service Hours 178000 L (47000 US gal) 218000 L (57600 US gal) of fuel 257000 L (68000 US gal) of fuel
3000 Service Hours 267500 L (70500 US gal) 327500 L (86400 US gal) of fuel 386500 L (102000 US gal) of fuel
6000 Service Hours 535000 L (141000 US gal) 654000 L (172800 US gal) of fuel 771000 L (204000 US gal) of fuel
Top End Overhaul 11000 Service Hours 9000 Service Hours 7500 Service Hours
1000000 L (264000 US gal) of fuel
Second Top End Overhaul 22000 Service Hours 18000 Service Hours 15000