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Old 07-06-2013, 06:54 PM   #1
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Perkins 4-107 Temp and Pressure Sending Units - Testing

How do I test the sending units for temperature and oil pressure? I gave the manuals a once over and do not see the procedure.

If it is a drawn out process, maybe someone could point me in the right direction. I am guessing it could be done with a multimeter checking resistance values, but I don't know how to do it.

Basically, I want to test my alarm system. I would like to be able to put it into alarm manually, from both the water temp, and the oil pressure.

Thanks
John
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Old 07-07-2013, 06:06 AM   #2
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For $20 to $30 why bother , a stand alone alarm will do just fine.

If you want to go first class the mechanical Murphy Alarm gauges are accurate and can have a stand alone battery for alert or auto secure as you desire.


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Old 07-08-2013, 08:18 AM   #3
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Thanks, It is probably easier to change out, but it would be nice to have a test procedure. Will a short to ground from the sensor work?
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Old 07-08-2013, 10:02 AM   #4
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If you want to test the temperature alarm you will have to remove the temp sender and expose it to the temperature at which the alarm is supposed to go off.

If you want to test the pressure alarm you will have to T off the sender with a mechanical gauge and a bleed valve. Crack the bleed valve to reduce the pressure going to the pressure sensor and see what pressure the alarm sounds. The other way is to install the T with mechanical gauge and see what pressure the alarm stops sounding during a start.

Or, remove the pressure sensor, T it off to a mechanical gauge with a tubing connection and use a hand pump of some sort to apply air or oil pressure to see what pressure the switch opens or closes to sound the alarm.
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