Engine Oil Pressure Safety Switch

TM 5-4320-258-34

b. Disassembly. Disassemble the oil filter as

Cleaning and Inspection.

shown in figure 3-11.

(1) Discard and replace the oil filter

element and gaskets.

(2) Clean all remaining parts with cleaning

solvent (FED. Spec. P-D-680).-Blow out tubes and

hoses with compressed air.

(3) Inspect the hose for abrasion, cracks,

deterioration, damaged threaded ends, and collapsed

walls; replace a damaged hose.

(4) Inspect the tube for dents, cracks,

damaged tube nuts, and collapsed walls; replace a

damaged tube.

(5) Inspect the filter body and cover for

cracks, distortion, dents, damaged threads, and other

damage; replace a damaged body or cover.

(6) Inspect the oil pressure sender for

cracks, dents, and damaged threads. Connect the

sender to a calibrated variable pressure air supply and

connect an ohmmeter across the electrical terminal and

ground of the sender. At zero air pressure resistance

through the sender must be zero ohms. Increase air

pressure in increments and check for the following

resistance readings:

Ohms 10%

Psi

2.0

4.1

6.5

9.3

10.8

13.8

(7) Inspect all other parts for cracks,

distortion, and damaged threads. Replace damaged

parts.

d. Reassembly and Installation, Reassembly

and installation are the reverse of removal and

disassembly. Refer to figures 3-10 and 3-11. After

installation, start the engine and check for oil leaks.

Correct any leaks.

Figure 3-11. Engine oil filter, exploded view.

3-12. Engine Oil Pressure Safety Switch

a. Removal.

(1) Disconnect the electrical leads from the

oil pressure safety switch. Tag leads to facilitate

reassembly.

(2) Disconnect the hose (5, fig. 3-9) and

the elbows (6 and 7i from the engine and from the oil

pressure safety' switch.

(3) Remove the oil pressure safety switch.

Refer to items 8 through 11 in figure 3-9.

b. Cleaning and Inspection.

(1) Clean the oil pressure safety switch with

a cloth dampened with cleaning solvent (FED. Spec.

P-D-680); dry thoroughly.

(2) Clean all remaining parts with solvent.

3-16