OIL PUMP - TM-10-3930-607-150056

ENGINE

removing the pump. When the pump is removed,

examine the drive gear carefully for wear. Inspect the

gear on the camshaft at the same time. The camshaft

and pump gear must be replaced, if scored or badly

worn,

Figure 55.

3. Engine oil pressure must be maintained at 20

PSI at engine governed speed for satisfactory engine

life. Pressure relief is located externally on the right-

hand side, near the oil pan flange, at the center. (Fig.

56) Pressure is controlled by a plunger and spring, the

latter specifically for a certain range.

The only

adjustment variation is either to change springs or add

or remove washers from behind the present spring. Up

to four washers are permissible. When replacing oil

pump drive gear, it is necessary to line up the hole in

the gear with the hole in the shaft.

NOTE:

Figure 54.

Pressure check can be made at the

2. Examine the pick-up screen for clogging or

oil-filter-inlet-line and block junction,

damage. Remove the cover. Be careful not to damage

the lead gasket which acts as a spacer as well as a

gasket. Examine the gears and pump body for any sign

of wear indicating lack of clearance. The gears should

have from .001" to .003" clearance in the chamber and

should make no contact with the walls. (Fig. 55)

Inspect the gear, cover and faces for excessive wear or

scoring. With the gasket assembled in the body, there

should be .0015" - .006" clearance between the gears

and the cover. Worn or scored gears and a worn cover

may be replaced. If the body shows wear in the

chamber, it can be replaced, but complete pump

replacement

would

economical.

Figure 56.

B-19