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Descriptions, Photos and Diagrams of Low Oil Shutdown Systems on Kohler Engines

OIL SENTRY PRESSURE SWITCH

For a cold engine at start up, the oil pressure can reach up to 60 psi. For a warm engine (normal operating temperature), at idle speed, the oil pressure can go down to 12 psi.

Testing

The Oil Sentry™ pressure monitor is a normally closed type switch. It is calibrated to open (break contact) with increasing pressure and close (make contact) with decreasing pressure within the range of 3.0/5.0 psi. Compressed air, a pressure regulator, pressure gauge, and a continuity tester are required to test the switch.

1. Connect the continuity tester across the blade terminal and the metal case of switch. With 0 psi pressure applied to the switch, the tester should indicate continuity (switch closed).

2. Gradually increase the pressure to the switch. The tester should indicate a change to no continuity (switch open) as the pressure increases through the range of 3.0/5.0 psi. The switch should remain open as the pressure is increased to 90 psi maximum.

3. Gradually decrease the pressure to the switch. The tester should indicate a change to continuity (switch closed) as the pressure decreases through the range of 3.0/5.0 psi; approaching 0 psi.

If the switch does not operate as specified, replace the switch.