FILTER ELEMENT AS-AIR 2W4246 - Caterpillar

1140, 1145, 1150, 1160, 3208 Truck EnginesThe number of hours an engine operates is the primary basis for oil change intervals and other preventive maintenance service, but most trucks are not equipped with hour meters. For this reason, service intervals are given in both hours and miles for easier control by most customers. To permit intervals in miles, conversions are made at the factory on a basis of the average number of miles driven per hour of engine operation in normal truck applications.
When a truck is used in a short distance application (pick up and delivery service), the average number of miles driven per hour of engine operation can be low enough that service intervals according to miles are not acceptable. In these applications, maintenance service must be done on a basis of hours of engine operation. For example, if a truck is driven an average of 500 miles per week (see the chart) and the engine operates thirty hours per week (six hours per day), the engine will have more than two times the normal permissible number of hours at an interval of 6000 miles. On trucks equipped with hour meters, the meter shows the hours of engine operation with good accuracy and can be used as a guide to engine service intervals. On trucks not equipped with hour meters, and used in pick up and delivery service, the approximate hours of engine operation must be found on a basis of the average number of hours the engine operates per day and multiplied by the number of days operated per week. The result of this analysis can be used to find service intervals in weeks. The use of this procedure is very important to prevent possible engine damage when trucks are used in this type of application.
For your assistance when an analysis of the truck application must be made, the chart shows change intervals for four possible applications where the engine operates approximately twenty, thirty, forty or sixty hours per week, as follows:
Twenty Hours (four hours per day)--Short distances with many deliveries, and the engine is generally stopped during delivery--eight-hour shift.
Thirty Hours (six hours per day)--Longer distances, or engine generally runs during delivery--eight-hour shift.
Forty Hours (eight hours per day)--Average time where the truck is used on a ten-hour shift.
Sixty Hours (twelve hours per day)--Average time where the truck is used on two eight-hour shifts.
Make the analysis with as much accuracy as possible because small differences in hours each day can cause a large difference in total hours when extended for several weeks. Accuracy will be improved if the analysis is made on a basis of the average hours for a period of time. At the same time, be sure to change the intervals if the truck is used in a different application for a period long enough to have an effect on the total hours.
When the average hours per week of engine operation is known, make a comparison of these hours with the average miles per week,