A Series Diesel Engine Lubricating System Flow 114
Oil Coolers
The engines use full flow, plate type oil coolers. The
oil flows through a cast passage in the cooler cover
and through the element where it is cooled by engine
coolant flowing past the plates of the element.
The use of incorrect components can cause high or
low oil temperature, varnish and sludge build up.
Oil Filters
After the oil is cooled, it flows through the full flow oil filter.
Oil Filter Bypass Valve
The oil cooler cover contains a safety valve that will let the oil flow bypass a plugged filter. The valve is designed
to open when the pressure drop across the filter is more than 138 kPa [20 PSI], as with a plugged filter, and lets
the oil continue on through the engine. When a filter becomes plugged, an oil pressure decrease of 50 kPa [7.2
PSI] or less from the normal operating pressure can be observed on the vehicle oil pressure gauge.
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