Engine Oil Pressure Switch and Sending Unit (cont).

TM 10-3930-638-24&P

2-31. SENDING UNITS AND SWITCHES MAINTENANCE (cont)

d. Engine Oil Pressure. Switch and Sending Unit (cont).

REMARKS

ACTION

ITEM

STEP

LOCATION

NSTALLATION/REPLACEMENT

Engine compart-

a. Fitting (8) and tee (7)

Install and

Until securely mounted on engine block

ment rear, right

tighten

side of vehicle

b. Sender (5) and

Install and

Until securely mounted to tee (7)

tighten

switch (6)

c. Wire lead (4), lock

Install and

Until wire lead (4) is securely mounted to

tighten

terminal of sender (5)

washer (3) and nut (2)

d. Harness connector (1)

Push on

Terminal of switch (6)

e. Wire leads (1 and 4)

Seal

Use silicone rubber sealer

and terminals

f. Resistor (10)

Position

In retainer halves (9)

g. Retainer halves (9)

Push together,

To secure resistor (10)

turn clockwise

and release

TESTING (OIL PRESSURE SENDER)

Engine compart-

a. Nut (2) and lock

Remove

ment rear, right

washer (3)

side of vehicle

b. Wire lead (4)

Disconnect

From oil pressure sender

c. Ohmmeter

Between oil pressure sender terminal and

Connect

engine block; set ohmmeter to X1 scale.

Ohmmeter should indicate 1 ohm or less

Operator's

IGNITION switch

Place in ON

Start and operate engine

compartment

position

With engine idling, resistance should be

Engine compart- a. Ohmmeter

Observe

ment rear, right

over 13.5 ohms; increase engine speed.

side of vehicle

Resistance indicated on ohmmeter

should increase

NOTE

If ohmmeter indicates more than I ohm in step 7 above, or if

resistance is not over 13.5 ohms or does not increase when

engine speed increases in step 9 above, replace oil pressure sender.

Operator's

IGNITION switch

Place in OFF

position

compartment

Engine compart- a. Ohmmeter

From oil pressure sender terminal and

Disconnect

engine block

ment rear, right

b. Wire lead (4)

To oil pressure sender terminal

side of vehicle

Connect

c. Lock washer (3) and

Install and

nut (2)

tighten

2-169