1. Bring the engine up to operating temperature. Shut
down the engine, remove the drain plug from the bottom of
the oil pan, and drain the oil into a suitable container.
2. Replace the oil pan drain plug and tighten the plug se-
3. Remove the drain plug from the filter shell and allow the
oil to drain.
4. Loosen the center bolt and remove the filter shell and fil-
ter element. Before discarding the filter element, inspect it
A. Inspect for metal particles.
B. Inspect the outside wrapper of the element for wrinkles
and the pleats for waviness or bunching. Presence of
these conditions indicates that the oil contains mois-
C. If the element is relatively clean, it may be possible to
lengthen the change interval. If the element is clogged,
the change interval should be shortened.
5. Remove the gasket from the filter head and discard it.
6. Clean the fitter shell thoroughly with a suitable solvent.
7. Check that the element end seal is in place in the filter
shell, and install a new element over the spring support as-
8. Install a new gasket in the fiiter head. Position the filter
shell and element on the filter head and tighten the center
9. Fill the engine to the "F" mark on the dipstick with the
Figure 5C-2. Engine Oil Filter
amount and type of lubricating oil specified in Section Ill.
Run the engine and check for leakage.
10. Shut down the engine. Allow 15 minutes for the oil to
drain back into the oil pan, and recheck the oil level. Add oil,
as required, to bring the oil level to the "F" mark on the dip-
CHANGE ENGINE FUEL FILTERS
The engine is equipped with two fuel filters located at the
should be installed each month or more frequently if en-
gine operation indicates plugged filters.
A method of determining when the elements are plugged to
the extent that they should be changed is based on the fuel
pressure at the cylinder head fuel inlet manifold and the in-
let restriction at the fuel pump. In a clean system, the maxi-
mum pump inlet restriction must not exceed 6 inches of
mercury. At normal operating speed (1800-2800 rpm) the
fuel pressure to 45 to 70 psi.
Change the fuel filters whenever the inlet restriction (suc-
tion), at the fuel pump, reaches 12 inches of mercury at nor-
mal operating speed and whenever the fuel pressure at the
inlet manifold drops to 45 psi.
Two types of filters are used; a "rock" type fuel strainer and
a replaceable element type fuel filter.
To replace the fuel strainer; proceed as follows (see Figure
Figure 5C-3. Fuel Filters