REFLECTOR: High oil temps

[romott at adelphia.net]

I almost had a heart attack!  I looked at 7.8 and said, crap, mine is plumbed wrong!!!  But after closer examination, most of us have IO360 C1C's and 7.11 is the correct drawing.  

But good info, Mack!  I have heard another fix is to add a washer to make the vernatherm close sooner.  Worked for Jim White down in Hilton Head. 

Ronnie

---- MMurp16900 at aol.com wrote: 
> subject Oil temperature
> Hi Jim.and all
> I am so happy you were able to lower your oil temperature.
> Yesterday we also had a great improvement with lower tempt. with our  LYC IO 
> 540.      
> Generally speaking LYC IO 360/320/540 engines the center port of the  
> accessory housing goes to the cooler and the top port returns from the  coolers..
> Please note fig. 7.8 in operators hand book for the IO360=A is incorrect  
> Lycoming knows it and is publishing a corrected page.
> the reason correct connection is important is the temperature probe is near  
> the return oil from coolers.Lyc. has issued several service letters and  
> bulletins about the thermostatic oil cooler bypass valve.
> When the valve is tightly closed all the oil goes thru the coolers when  open 
> the coolers are by passed.This operation can be check by putting it in a  can 
> of hot oil.@ 180 F it grows in length .16 inches   @250 F its  length grows 
> to .53 inches.
> We complied with the  Lycoming service bulletin to regrind the valve  seat in 
> the filter housing.We tried every thing we could think of .On on hot day  the 
> temperature would approaching line 245F
> .yesterday We did something unorthodox.
> We removed the snap ring from the valve and installed a longer 3/16  dia..... 
> rod reassembled so the valve  closed all the time.and all the oil  must go 
> thru the cooler It worked.
>  OUT side temperature 80 f  a climb  to 10000ft at 90 kts.  max. oil 
> temperature 220 F.
>  
> Mack Murphree A-P  I-A. EAA Technical  counselor.