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Oil Temperature Guage on Yak 55M

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heaysr(at)telus.net
Guest

Posted: Sun Jul 02, 2006 9:35 am Post subject: Oil Temperature Guage on Yak 55M

After many hundereds of hours of well behaved indications the oil

temperature guage on my Yak 55M has begun to flicker right up to full

deflection. This occurred for the first time yesterday on start up when the

oil was known to be cool. The guage is the standard Russian guage that goes

with the M14P on all the Yaks I have seen.



Any pointers?



Royden Heays

C-GRED

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dsavarese(at)elmore.rr.co
Guest

Posted: Sun Jul 02, 2006 5:41 pm Post subject: Oil Temperature Guage on Yak 55M

It may very well be the oil temperature sending unit.  Don't assume it's the 

instrument without checking out the sending unit.

Dennis



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wlannon(at)cablerocket.co
Guest

Posted: Sun Jul 02, 2006 9:10 pm Post subject: Oil Temperature Guage on Yak 55M

Hi Royden;



The oil temp gauge (and carb air temp) are Wheatstone bridge circuit 

instruments. The snag you describe suggests an intermittent open circuit 

somewhere in the system. It could be in the instrument, the wiring harness, 

connectors or internally in the probe.

If you select "oil out" does the problem continue? That uses a different 

probe and harness (but to the same inst. connector). You can swap the probes 

for trouble shooting, all three are identical,

An open circuit will cause a full scale reading. Good luck.



Walt



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mark.bitterlich(at)navy.m
Guest

Posted: Wed Jul 05, 2006 3:27 am Post subject: Oil Temperature Guage on Yak 55M

Just wanted to concur with everyone else on this one.  Everytime I have seen this problem it has been the sending unit, or a bad electrical contact on the plug AT the sending unit (as in an open as already described).  Also, as has also been mentioned... you can simply swap it out with the carb temp probe to check it... both are identical.  Not adding anything new... just double confirming that what has already been mentioned is also exactly what I have found in the past as well on more than one aircraft. 



Mark Bitterlich

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