Figure 14. Typical In-Line Engine Oil Filter Mounting
Figure 15. Typical V-Type Engine Oil Filter
The Series 53 engine lubricating system, illustrated in Figs. 16 and 17, includes an oil intake screen and tube assembly,
an oil pump, a pressure regulator, a full-flow oil filter or by-pass filter with by-pass valve, and an oil cooler with a by-pass
Lubricating oil from the pump passes from the lower front cover through short oil galleries in the cylinder block. From the
block, the oil flows to the full-flow oil filter, then through the oil cooler (if used) and back into the front engine cover and
cylinder block oil galleries for distribution to the various engine bearings. The drains from the cylinder head(s) and other
engine parts lead back to the oil pan.
Oil pressure is regulated by a pressure relief valve mounted in the engine front cover. Oil cooler and oil filter by-pass
valves prevent the stoppage of oil flow if these items become plugged.
Each engine is equipped with a full-flow type lubricating oil filter (Figs. 14 and 15). If additional filtering is required, a
by-pass type oil filter may also be installed.
All of the oil supplied to the engine passes through the full-flow filter that removes the larger foreign particles without
restricting the normal flow of oil.
The by-pass filter assembly, when used, continually filters a portion of the lubricating oil that is being bled off the oil
gallery when the engine is running. Eventually all of the oil passes through the filter, filtering out minute foreign particles
that may be present.
The lubricating oil filter elements should be replaced, each time the engine oil is changed, as follows:
1. Remove the drain plug and drain the oil.
2. The filter shell, element and stud may be detached as an assembly, after removing the center stud from the base.
Discard the gasket.
3. Clean the filter base.
4. Discard the used element, wipe out the filter shell and install a new element on the center stud.
5. Place a new gasket in the filter base, position the shell and element assembly on the gasket and tighten the center
stud carefully to prevent damaging the gasket or center stud.
6. Install the drain plug and, after the engine is started, check for oil leaks.