Coolant Temperature And Oil Pressure Switches - Ford Models - Genie GS-3390 Service Manual

Section 4 • Repair Procedures
ENGINES
4-5
Coolant Temperature and
Oil Pressure Switches -
Ford Models
The engine coolant temperature switch is a
normally open switch. The switch contacts close at
approximately 230 o F / 110
temperature rises above the switch point, the
switch contacts close and the engine will shut off to
prevent damage. The engine will not start until the
temperature drops below the switch point. A fault
indicator light at the ground controls should turn on
when the switch closes.
The engine oil pressure switch is a normally closed
switch. The switch contacts open at approximately
8 psi / 0.55 bar. If the oil pressure drops below the
switch point, the switch opens and the engine will
shut off to prevent damage. A fault indicator light at
the ground controls should turn on when the switch
opens.
How to Remove the
Coolant Temperature and
Oil Pressure Switches
Burn hazard. Contact with hot
engine fluids or components may
cause severe burns.
Note: Perform this procedure with the engine off.
1 Release the latches on the engine tray and fully
slide the engine tray out.
2 Insert a 6 inch / 15 cm screwdriver or rod into
the engine tray lock hole located on the tank
side of the engine tray to prevent the engine
tray from moving.
3 Locate the oil pressure or coolant temperature
switch.
4 - 58
o C. If the coolant
GS-3390 • GS-4390 • GS-5390
b
a oil pressure switch
b coolant temperature switch
(hidden from view)
4 Tag and disconnect the wiring from the desired
switch. Remove the switch from the engine
block.
5 Install and tighten the new switch. Torque to
specification.
6 Connect the wires to the new switch.
Note: Always use pipe thread sealant when
installing a sending unit.
Coolant temperature switch specifications
Torque
Hex size
Temperature switch point
Oil pressure switch specifications
Torque
Hex size
Oil pressure switch point
July 2007
REV D
a
8-10 ft-lbs
11-14 Nm
13
/ inch
16
230°F
110°C
8-10 ft-lbs
11-14 Nm
1
1 / inches
16
8 psi
0.55 bar
Part No. 72863