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TM 10-3930-638-24&P
2-31. SENDING UNITS AND SWITCHES MAINTENANCE (cont)
d. Engine Oil Pressure. Switch and Sending Unit (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
NSTALLATION/REPLACEMENT
6
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)
switch (6)
tighten
c. Wire lead (4), lock
Install and
Until wire lead (4) is securely mounted to
washer (3) and nut (2)
tighten
terminal of sender (5)
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)
7
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
Connect
Between oil pressure sender terminal and
engine block; set ohmmeter to X1 scale.
Ohmmeter should indicate 1 ohm or less
8
Operator’s
IGNITION switch
Place in ON
Start and operate engine
compartment
position
9
Engine compart- a. Ohmmeter
Observe
With engine idling, resistance should be
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.
10
Operator’s
IGNITION switch
Place in OFF
compartment
position
11
Engine compart- a. Ohmmeter
Disconnect
From oil pressure sender terminal and
ment rear, right
engine block
side of vehicle
b. Wire lead (4)
Connect
To oil pressure sender terminal
c. Lock washer (3) and
Install and
nut (2)
tighten
2-169
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