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  #1  
Old 01-19-2020, 01:57 AM
Reilly Reilly is offline
 
Join Date: Oct 2008
Location: South Africa
Posts: 52
Default Light switches cause spike in oil temperature

Hi
I have a RV9 with a O320

It has 795 hours and now if I turn any of the landing light, strobe or nav lights on it causes an immediate spike in my oil temperature reading.

Any idea on where I should start looking?
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  #2  
Old 01-19-2020, 02:26 AM
GeoffP GeoffP is online now
 
Join Date: Sep 2018
Location: Warrimoo, NSW, Australia
Posts: 80
Default Voltage drop?

I'm no expert by any means, but if the sensor relies on voltage then what you may be seeing is the drop in voltage from switching on something else. I'd probably look for a bad connection (either power or earth) to your oil temp sender.
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Old 01-19-2020, 07:25 AM
vic syracuse vic syracuse is offline
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Default

You have a bad ground. The oil temp sensor is nothing but a resistor that changes according to temperature. We are basically measuring the voltage across the resistor to ground.

First, check your engine ground. It is the most likely source. If not that, check the ground(s) to your instrument panel.

Vic
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Old 01-19-2020, 09:17 AM
rocketman1988 rocketman1988 is online now
 
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Default ...and

This issue is detailed in The Aeroelectric Connection book...
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  #5  
Old 01-19-2020, 09:25 AM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
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Default

Concur with others -- this is a grounding (current return path) issue. Either the grounding to the airframe at the lights -OR- the gauges, etc.

I had a '80 Mooney 231 that would do the same thing every time I keyed the mic - turned out to be a bad ground on the analog instrument cluster.

Cheers!
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