Section 4 • Repair Procedures
REV B
November 2008
4 - 30
GS-2668 RT • GS-3268 RT
Part No. 112657
6-3
Flex Plate
See 4-4,
Flex Plate.
6-4
Coolant Temperature and Oil
Pressure Switches
The engine coolant temperature switch is a
normally open switch. The switch contacts close at
approximately 221
°
F / 105
°
C. If the coolant
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.
The engine oil pressure switch is a normally open
switch. The switch contacts close at approximately
4.27 psi / 0.3 bar. If the oil pressure drops below
the switch point, the contacts close and the engine
will shut off to prevent damage.
A fault code will be shown in the diagnostic display
window at the ground controls when either switch
closes.
How to Replace the Coolant
Temperature and Oil Pressure
Switches
1 Open the engine side cover and pull up on the
lock pin on the engine pivot tray located under
the radiator. Swing the engine pivot tray out and
away from the machine to access both
switches.
2
Coolant temperature switch:
Tag and
disconnect the wiring from the switch, located
at the engine coolant outlet just above the
alternator. Remove the switch from the engine.
Oil pressure switch:
Tag and disconnect the
wiring from the switch, located at the top of the
engine just in front of the valve rocker cover.
Remove the switch from the engine.
Bodily injury hazard. Contact with
hot engine fluids or components
may cause severe burns.
3
Coolant temperature switch:
Install the new
switch. Torque to 20 ft-lbs / 27 Nm.
Oil pressure switch:
Install the new switch.
Torque to 88 in-lbs / 10 Nm.
Note: Always use pipe thread sealant when
installing a new switch.
PERKINS 403D-11 and 403C-11 ENGINES
Summary of Contents for GS-2668 RT
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