REFLECTOR: Engine compartment oil cooler

[Sid Knox]

> Turned out to be
> the vermilium(sp?) valve..


"In Lycoming engines, oil passing through the oil temperature control cavity goes either through the oil cooler or the crankcase passages. Which way it goes depends on the oil's temperature. It also depends on the condition of the vernatherm. If the vernatherm leaks, oil bypasses the cooler. 
Not all Lycomings have vernatherms. On those that do have them, the vernatherm's location on the engine varies. Engines with both an oil filter and a vernatherm usually have both of them together, with the vernatherm mounted on the filter adapter." 


look here for the full story:
http://www.avweb.com/news/maint/182617-1.html

Sid Knox


----- Original Message ----- 
From: "Craig and/or Denise Woolston" <cdwoolston at verizon.net>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Sent: Thursday, April 28, 2005 7:59 AM
Subject: RE: REFLECTOR: Engine compartment oil cooler


> This might be too little, too late, but I recently had a friend (RV-6A) who
> had "higher than everyone else" oil temps (~200degF).  Recently he went from
> fixed to constant speed pitch and his oil temps went up some.  So he thought
> that it was time to add a second oil cooler.  After going through the
> trouble of doing that, one day the oil temps sky rocketed.  Turned out to be
> the vermilium(sp?) valve, not oil coolers at all.  Replaced that, oils temps
> now 175degF.  Has probably been a problem since day one on a factory new
> engine.
> 
> Might want to check that first, as it's much easier.  I understand the
> technique is to remove it and check like a automotive thermosat.
> 
> Craig
> XL5FG
> 
>
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