oil temp rapid fluctuation

jaroberts2pe

New Member
Joined
Sep 28, 2008
Messages
21
my oil temp on D-180 shows temp climbing as engine warms but when it reaches about 220 it starts fluctuating wildly, between 220 and 262. I tried different oil temp sender, same results.
 

Dynon

Dynon Staff
Staff member
Joined
Jan 14, 2013
Messages
13,260
Location
Woodinville, WA
That's a little puzzling. Has it always done that, or is it new? Generically, fluctuation oil temp is usually suspected to be a grounding issue, but the fact that it only hits at a certain temperature is confusing. You might want to give our technical support team a call at 425-402-0433 or support at dynonavionics dot com
 

jakej

Active Member
Joined
Oct 10, 2007
Messages
1,635
Location
Australia
# 1 - with any engine sensor or device connected to ANY ems system is to use the system grounds, even if you have to double up on a ground wire.  This may not apply in your situation however it is a good general rule IMO & experience.
There may be other causes for your situation but the above is a first ‘port of call’ & most cost effective first step.  ;)
# 2 - worst case may be a defective oil vernatherm (thermostat) valve, or something completely different.
 
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