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  #11  
Old 12-10-2009, 05:42 PM
scsmith scsmith is offline
 
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Default all ports are pipe thread

All three of those ports have a pipe thread in them. IIRC, it is a 3/8 NPT. Use AN flare-pipe thread adapter fittings.

My IO-360-A1A manual shows either A or C as OK for the "to cooler" port. The B port is always for oil return from cooler. Either way, the oil goes through the spin-on oil filter housing first, and the vernatherm is installed in that housing. When the Vernatherm closes, it sends the oil into the passage that feeds both the A and C ports. When the vernatherm is open, it allows oil to go straight to the pressure regulator passage, bypassing the cooler.

Correction: What Dan said below is correct - my mistake - the oil goes through the filter AFTER coming back from the cooler (or straight from the pump if the vernatherm is open). But Both ports A and C still do the same thing - they send oil to the cooler when the vernatherm is closed.
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Last edited by scsmith : 12-10-2009 at 07:18 PM. Reason: added correction
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  #12  
Old 12-10-2009, 06:15 PM
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DanH DanH is offline
 
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Default

Quote:
Originally Posted by hcccs View Post
Connecting the cooler to the A port means that it will cool all the time.
It is true that some oil is always flowing through the cooler. When cold it is a small quantity. When hot it is the entire pump output.

Quote:
If I understand it right, the Vermitherm valve will regulate the amount of oil that will flow into the oil cooler.
Cold oil has two open pathways. Some oil takes port A and flows through the cooler to port B. Some continues up the vertical passage past port A to the back of the filter adapter housing where it passes through the fully open vernatherm bypass port. The path through the cooler has far more flow resistance than the bypass path, in particular when cold. Most of the oil takes the bypass.

As the oil warms the vernatherm extends, progressively closing the bypass port. More oil flows through the cooler.

When the oil is hot it can only take the port A path because the vernatherm bypass port is closed. All oil flows through the cooler.

Key concept: The vernatherm controls flow to the cooler by how much it blocks the alternate passage.
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  #13  
Old 12-10-2009, 06:29 PM
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Recommend a review of the schematic leading this thread:

http://www.vansairforce.com/communit...ight=schematic

Always much confusion about Lycoming accessory case oil flow.
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  #14  
Old 12-11-2009, 04:03 AM
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hcccs hcccs is offline
 
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Lightbulb

Quote:
Originally Posted by DanH View Post
Recommend a review of the schematic leading this thread:

http://www.vansairforce.com/communit...ight=schematic

Always much confusion about Lycoming accessory case oil flow.
Thank you all for the info. If the 'A' and 'C' port do the same thing I will go for the 'A' port. It will make things easier.
The 'C' port doesn't seem to have a pipe thread at all. I tried a -8 fitting in the 'C' port but it wouldn't go in.
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  #15  
Old 12-11-2009, 06:09 AM
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hcccs hcccs is offline
 
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Thumbs up Final

Quote:
Originally Posted by DanH View Post
It is true that some oil is always flowing through the cooler. When cold it is a small quantity. When hot it is the entire pump output.



Cold oil has two open pathways. Some oil takes port A and flows through the cooler to port B. Some continues up the vertical passage past port A to the back of the filter adapter housing where it passes through the fully open vernatherm bypass port. The path through the cooler has far more flow resistance than the bypass path, in particular when cold. Most of the oil takes the bypass.

As the oil warms the vernatherm extends, progressively closing the bypass port. More oil flows through the cooler.

When the oil is hot it can only take the port A path because the vernatherm bypass port is closed. All oil flows through the cooler.

Key concept: The vernatherm controls flow to the cooler by how much it blocks the alternate passage.
When I saw your schematic this is what I thought - oil flowing both ways but regulated by the Vernatherm. I'll use the 'A' port and plug the 'C' port.

What would I do without all knowlegable people in VAF Forum.
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  #16  
Old 12-11-2009, 10:23 AM
jrs14855 jrs14855 is offline
 
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Default OIL COOLER

Just checked an 0 320 acc case. While C might appear to accept a pipe thread fitting, it will not. This a straight thread hole for the plug and gasket as posted by Dan. The post by scsmith is incorrect regarding C. The two Lycoming 0 320 "installation drawing rear view" that I have do not show C at all.
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  #17  
Old 12-17-2009, 01:25 PM
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flyingbeaver26 flyingbeaver26 is offline
 
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Default Thermal prob on "C"

Guys, I am currently undergoing the same investigation. I have an factory direct IO360-M1B. The "C" hole is actually located on the filter accessory housing that bolts onto the accessory case. I also tried to assemble a -8 AN fitting into the "C" opening. It does not appear to be a NPT thread. So I am thinking this is where the oil temperature probe is assembled? That seems to be the only logical answer to me. The manual that came with my Lycoming doesn't illustrate any of this. If that is not right, then where does the oil temp prob typically go? Will that come with my EFFIS EIS install kit?

Thanks,
Brad
RV-8
Austin
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  #18  
Old 12-17-2009, 02:10 PM
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Quote:
Originally Posted by flyingbeaver26 View Post
I have an factory direct IO360-M1B. The "C" hole is actually located on the filter accessory housing that bolts onto the accessory case.
Unlikely. Study two common oil filter adapter styles in the thread with the schematic, referenced above.
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  #19  
Old 12-17-2009, 04:43 PM
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flyingbeaver26 flyingbeaver26 is offline
 
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Default

Quote:
Originally Posted by DanH View Post
Unlikely. Study two common oil filter adapter styles in the thread with the schematic, referenced above.
Dan, This picture is of an oil filter accessory housing. Notice it has a oil temp probe location. This is the thread that I am referring to. This one just happens to be a right angle version as mine is a parallel version. My point is that I think that this thread for the temp sensor is not a NPT pipe thread. Therefore I'm guessing it must be for the temp probe that uses a slightly different thread. Therefore the "C" orifice in the original picture might also likely be a temp sensor attach point. Possible? Can anybody confirm what the threads on a oil temp probe look like? I don't own one yet.


Thanks,
Brad
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  #20  
Old 12-18-2009, 05:34 AM
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ronschreck ronschreck is offline
 
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Default

I have been researching this topic because I want to plumb in an oil accumulator. Port "C" is the logical place to connect. This is not a NPT threaded port. It is a straight/bolt thread. Does anyone know of a source for a fitting that will connect this port to a #8 flare?
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