1140, 1145, 1150, 1160 And 3208 Truck Engines
Description of Change: Two new oil filter assemblies are used in the lubrication systems for the above truck engines. One filter has an internal bypass valve, and the other does not.
The filter with the bypass valve is used on earlier engines that have oil filter bases without internal bypass valves. The filters without bypass valves are used on engines which have later oil filter bases with bypass valves.
The filters are of common construction, except for the bypass valve. See the Illustration.
The two types of filters can not be used in place of each other.
It is important to use the correct oil filter for the engine and to follow the correct change interval.
Products of combustion (foreign material), like carbon, get into the engine oil during operation. This foreign material is held in suspension in the oil until it is removed by the filter.
If the filter element becomes too "dirty" (full of foreign material) because of use, the bypass valve will open. This permits dirty oil to flow through the engine, but not through the filter. Extended use of dirty oil will cause piston rings and valves to stick (not move freely) and increased cylinder liner wear.
Adaptable As: The 9N5680 and 8N9586 Filter Assemblies are direct replacements for the former 9L9200 and 9N5570 Filter Assemblies, respectively. The 9L9200 Filter Assembly is canceled. The 9N5570 Filter Assembly is still available. The 9N5680 Filter Assembly has an internal bypass valve. It is used with earlier bases that do not have bypass valves. The 8N9586 Filter Assembly does not have an internal bypass valve. It is used on later filter bases which have bypass valves.