Section II. REPAIR OF THE ENGINE LUBRICATION SYSTEM

(3) Remove the fuel gage sending unit. Be

onto the spider shaft. Replace if they do not slide

careful not to bend the float arm when removing

easily.

the unit from the tank.

(4) Inspect the drive gear (18) for worn or

c. Cleaning. Inspection and Repair.

chipped teeth. Inspect machined surfaces for

(1) Drain sediment from the fuel tank by

scoring. Replace the gear if necessary.

opening the shutoff valve at the bottom of the fuel

(5) Replace the weights (22) if they fit loosely

tank.

or bind on the pivot pins (21).

(2) Clean the tank with a solvent.

(6) Inspect the bearing (5) and thrust washer

(3) Inspect the tank for leaks, cracks, dents,

(6) for worn spots or score marks. Replace the

rust or corrosion.

bearing if it fits loosely in the adapter housing (7).

Warning: Before repairing the fuel tank,

(7) Replace the spring (1.5) if it is cracked or

be sure the interior of the tank has been

weak.

properly cleaned of gasoline and vapor to

d. Reassembly.

prevent hazard to personnel.

(1) Install the bearing (5,fig. 3-3) so that the

(4) Repair the tank if it is damaged. Replace

oil holes is up. Press into the housing (7).

the tank if it is damaged beyond repair.

(2) Assemble the remaining components in

(5) Inspect the copper fuel line and hose for

the reverse order of disassembly.

damaged connectors, crimping, cracks or oil soaked

e. Installation. Install the governor by reversing

hose. Replace damaged lines.

the removal procedure. Refer to TM 10-3930-624-

d. Reassembly. Reassemble in the reverse order

12 for the adjustment procedure.

of diassembly.

3-4. Fuel Tank

e. Installation. Refer to TM 10-3930-624-34-

a. Removal. Refer to TM 10-3930-624-12.

12. After the fuel tank is installed and filled with

b. Disassembly.

gasoline. open the shutoff valve and start the engine

(1) Remove the fittings and allow the

and check for fuel leaks.

remaining fuel to flow from the tank.

(2) Remove the filler assembly by un screwing

it from the top of the tank.

Section II. REPAIR OF THE ENGINE LUBRICATION SYSTEM

3-5. General

No. 1 cylinder before removing the oil pump. This

is done by positioning the No. 1 piston on the

The purpose of the lubrication system is to reduce

compression stroke with ''IGN''in the center of the

friction between moving parts such as gears,

timing hole in the flywheel housing. In this position

bushings. shafts. bearings, and pistons. The

the piston is before top dead center. Mark the side

lubrication system consists primarily of the oil

of the distributor housing to indicate the position of

pump. oil pressure valve. oil pan, and oil filter. The

the rotor.

oil pressure in the system is pre-set to 35 to 40 psi at

(2) Remove the oil pan. Refer to paragraph

fulI governed speed with the engine oil hot. After

3-8.

the engine has been run-in, the oil pressure

(3) Remove the capscrews and lockwashers

operating range is 25 to 35 psi at rated engine

which secure the oil pump to the cylinder block.

operating speed arld normal operating temperature.

(4) Loosen the nut at the oil pump end of the

The pressure at idle is approximately 15 psi. A

oil tube assembly. Remove the pump from the

relief valve in the oil pump returns the oil to the oil

cylinder block.

pan when the discharge pressure exceeds 70- 90

b. Disassembly. (fig. 3-4).

psi.

(1) Remove the screen retaining wire (1) and

3-6. Oil Pump

the oil screen (2). Remove the pump cover (5).

a. Removal.

(1) Position the distributor rotor to fire on the

3-5