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Vernatherm stuck open?

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recapen(at)earthlink.net
Guest

Posted: Tue Dec 01, 2009 7:31 am Post subject: Vernatherm stuck open?

Folks,



I think my Vernatherm is stuck in the open position allowing oil to always flow through the oil cooler.



Here's the basis for my thinking:



In October during some of my flights, I was seeing OAT's of 35 and 40 with corresponding OilT's of 174 and 179.



In November during one flight I had OAT of 62 and OilT of 177 - I stopped and had lunch - during the flight home, I had OAT of 65 and OilT of 146.  Yes plenty of time for it to have warmed up...and no, I didn't change anything on the airplane during lunch.



All flights after that one have had OAT's in the 50's and 60's with OilT's not breaking 140.



Your thoughts please... How do I unstick the Vernatherm?  Is it possible that during lunch that day, my rings seated and my engine finished its break-in process?



Thanks,

Ralph

RV6A N822AR (at) N06 46.3 hrs - happy with the CHT's, found something else buggin' me

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Tue Dec 01, 2009 8:56 am Post subject: Vernatherm stuck open?

The Vernatherm doesn't work that way. It has an expanding salt/wax 

inside and expands with temperature until it closes the bypass opening. 

There are published dimensions, so you can remove the vernatherm, 

measure its length and see whether it is at the expanded dimension or 

cold dimension. You also could just create a cover for your oil cooler 

with say 50% as big an opening as the cooler itself, and see if it makes 

a difference, watching to see oil doesn't get too hot.



Ralph E. Capen wrote:

 	  Quote: 	
		   

 

 Folks,

 

 I think my Vernatherm is stuck in the open position allowing oil to always flow through the oil cooler.

 

 Here's the basis for my thinking:

 

 In October during some of my flights, I was seeing OAT's of 35 and 40 with corresponding OilT's of 174 and 179.

 

 In November during one flight I had OAT of 62 and OilT of 177 - I stopped and had lunch - during the flight home, I had OAT of 65 and OilT of 146.  Yes plenty of time for it to have warmed up...and no, I didn't change anything on the airplane during lunch.

 

 All flights after that one have had OAT's in the 50's and 60's with OilT's not breaking 140.

 

 Your thoughts please... How do I unstick the Vernatherm?  Is it possible that during lunch that day, my rings seated and my engine finished its break-in process?

 

 Thanks,

 Ralph

 RV6A N822AR (at) N06 46.3 hrs - happy with the CHT's, found something else buggin' me

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

recapen(at)earthlink.net
Guest

Posted: Wed Dec 02, 2009 5:06 am Post subject: Vernatherm stuck open?

Can anyone provide the published dimensions - or point to the publication they are published in?



I have some pubs - but don't know where to look...



Thanks,

Ralph



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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Dec 02, 2009 5:16 am Post subject: Vernatherm stuck open?

I found a couple different measurements, but haven't found the specs yet

cold: 3.800" hot:4.031"



diff: 0.231 (3/16" = 0.1876")

The Vernaterm should extend at least 0.160" Between 150 F and 185 F (the 

temperature stamped on the Vernatherm 85 C ).

These are individual opinions or measurements..I'm still looking for 

something official.



Ralph E. Capen wrote:

[quote] 

 

 Can anyone provide the published dimensions - or point to the publication they are published in?

 

 I have some pubs - but don't know where to look...

 

 Thanks,

 Ralph

 

 --

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

recapen(at)earthlink.net
Guest

Posted: Wed Dec 02, 2009 5:24 am Post subject: Vernatherm stuck open?

Good starting place - thanks....



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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Dec 02, 2009 6:14 am Post subject: Vernatherm stuck open?

I forgot to mention that if the Vernatherm seems to be working, but oil 

temps are too high, you can try substituting the Continental vernatherm 

gasket in place of the Lycoming gasket, as the TCM part is half as thick 

and would allow the vernatherm to close off the bypass at a cooler temp.



Ralph E. Capen wrote:

[quote] 

 

 Good starting place - thanks....

 

 --

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

recapen(at)earthlink.net
Guest

Posted: Wed Dec 02, 2009 6:44 am Post subject: Vernatherm stuck open?

I have the opposite problem...oil temps too low!



My engine builder has indicated that the vernatherm won't completely block flow to the cooler so there will always be some cooling action.



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PeterHunt1(at)aol.com
Guest

Posted: Wed Dec 02, 2009 3:07 pm Post subject: Vernatherm stuck open?

Ralph,

  

 Ralph, your problem is more likely a failed temperature gauge or failed temperature sender than a problem with your Vernatherm.  Are they Van's gauges?  Van's instruments/gauges fail frequently.  I replace at least one of my Van's gauges every 12 months.  Van's gauges are inexpensive, but prone to failures.  Sometimes the failures are only partial.  For example, I just replaced my Van's tachometer gauge which was reading 340 rpm too low.

  

 Pete in Clearwater

 RV-6 completed in 2005

  [quote][b]

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recapen(at)earthlink.net
Guest

Posted: Wed Dec 02, 2009 5:33 pm Post subject: Vernatherm stuck open?

Pete,

  

 My guages are part of an Advanced Flight  Systems 3400 Engine Monitor....but I will be pulling the temp sensor and  vernatherm and dunking them in boiling oil/water to test and compare with a  candy thermometer during my conditional later this month.

  

 I'll let folks know the  results....

  

 Thanks,

 Ralph

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