Section IV. REPAIR OF ENGINE LUBRICATION SYSTEM

Section IV. REPAIR OF ENGINE LUBRICATION SYSTEM

c. Installation.

3-11. General

(1) Cement new gaskets (1, fig. 3-10) to oil

This section will cover direct support maintenance of the

pan side rails.

engine lubrication system authorized by the maintenance

(2) Outer oil seal at rear of engine should be

allocation chart, and includes the oil pan, oil pressure

replaced when engine is overhauled. If engine has not

relief valve, and oil pump. The oil pressure relief valve

been overhauled, inspect lower portion to make certain it

has an external adjustment that direct support may use

is in good condition. If outer seal has be to replaced, it

to assist in making determination of internal bearing

will be necessary to remove flywheel housing (para 3-

failure (low oil pressure), or clogged passages (high

26).

pressure).

(3) Oil pan front gasket is lower portion of

3-12. Oil Pan a. Removal and Inspection.

cylinder block to front plate assembly gasket. When

NOTE

engine is overhauled, new gasket should be cemented to

Oil pan can be removed from engine

rear of front plate assembly before it is secured to front

with engine-either installed in truck

of cylinder block. If engine has not been overhauled and

or out of truck. If engine has already

oil pan portion of gasket is damaged, scrape away

been removed from truck, disregard

gasket as far as cylinder block rails. Cut lower portion

(1) through (4) below.

from new gasket and cement in position on front plate

(1) Run engine until normal operating

assembly.

temperature is reached.

(4) Before installing oil pan, place a small

(2) Remove drain plug (10, fig. 3-10) and

quantity of nonhardening sealing compound in corners

allow all engine oil to drain.

formed by flywheel housing and cylinder block rails, and

(3) Remove radiator grille from counterweight

front plate assembly and cylinder block rails, to eliminate

(ref. TM 10-3930-618-20).

possibility of oil leaks at these points.

(4) Raise back of truck and remove steering

(5) Position oil pan on cylinder block and

axle assembly (para 2-14) to allow sufficient room for

secure in place with capscrews and lockwashers.

removal of oil pan.

Torque capscrews to 18-21 ft-lbs.

NOTE

CAUTION

It will be necessary to work through

Be sure to use copper washers on

the

grille

opening

the

lower three capscrews in front of oil

counterweight in order to remove the

pan. These three capscrews extend

front oil pan capscrews.

into oil pan and copper washers

(5) Remove capscrews (8) from front of oil

prevent oil leakage past capscrew

pan and pan side flanges. Remove oil pan.

threads.

(6) Wash oil pan with cleaning solvent (Spec.

(6) Install drain plug in oil pan.

P-S-661) to remove all dirt and sludge.

(7) If engine has not been removed from

(7) Inspect drain plug boss for evidence of

truck, install steering axle assembly by a direct reversal

leakage.

of removal procedure.

(8) Repair by welding or hard soldering.

(8) Install rear grille in counterweight.

WARNING

(9) Replace oil filter element and fill

Be certain that all traces of oil and

crankcase to correct oil level.

cleaning solvents have been removed

(10) Run engine and check for oil leaks oil pan

from the oil pan and the surrounding

and at filter.

area before any heat or flame is used.

3-15