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  #1  
Old 01-25-2017, 12:20 PM
pastranafan5 pastranafan5 is offline
 
Join Date: May 2014
Location: jonesboro, ar
Posts: 63
Default Changing a constant speed engine to a fixed pitch engine

Does anybody know if this is a simple change or something that I shouldn't do? I'm thinking about getting a Catto prop for my constant speed O-320, so it would need to be changed.
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  #2  
Old 01-25-2017, 12:51 PM
chrisbryanolsen chrisbryanolsen is offline
 
Join Date: Oct 2011
Location: Albuquerque
Posts: 92
Default See the SI

See this lycomling SI for a start: https://www.lycoming.com/content/ser...uction-no-1435
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  #3  
Old 01-25-2017, 01:03 PM
Fred.Stucklen's Avatar
Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
Default Constant speed to fixed pitch

There does exist a way to very easily make the change WITHOUT modifying the freeze plugs in the crankshaft, or removing the stainless line that goes back to the governor pad. It DOES require the removal of the governor, and a specially machined governor pad cover.

My IO-360 was delivered from Matituck Aviation with this setup so I could run a fixed pitch prop. Mahlon (whom monitors this site) can tell you more about how to get this special governor pad cover.

Quote:
Originally Posted by pastranafan5 View Post
Does anybody know if this is a simple change or something that I shouldn't do? I'm thinking about getting a Catto prop for my constant speed O-320, so it would need to be changed.
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Last edited by Fred.Stucklen : 01-25-2017 at 01:11 PM. Reason: Fixed spellin of Mahlon
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  #4  
Old 01-25-2017, 01:36 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
Default Crankshaft

With the special cover you still need to install the front plug when installing the fixed pitch prop and remove it for installing constant speed.
I see this as a good option for those desire to change back and forth between fixed and c/s.
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  #5  
Old 01-25-2017, 01:41 PM
Fred.Stucklen's Avatar
Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
Default

Not if he's removing a constant speed prop....


Quote:
Originally Posted by jrs14855 View Post
With the special cover you still need to install the front plug when installing the fixed pitch prop and remove it for installing constant speed.
I see this as a good option for those desire to change back and forth between fixed and c/s.
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RV-7A N924RV Flying (1825 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
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  #6  
Old 01-25-2017, 02:03 PM
pastranafan5 pastranafan5 is offline
 
Join Date: May 2014
Location: jonesboro, ar
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Default

Does anybody know how I can get one of those covers?
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  #7  
Old 01-25-2017, 02:33 PM
drone_pilot drone_pilot is offline
 
Join Date: Jan 2014
Location: Hobbs, NM
Posts: 239
Default

I found a suitable cover on EBay. Likewise for the allen hex plug down in the crank, purchase a high quality Snap-On, etc hex wrench to remove it. Do not use a ball end hex wrench. They break off. Ask me how I know. With the right tool, the job is very easy.
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  #8  
Old 01-25-2017, 03:55 PM
Fred.Stucklen's Avatar
Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
Default Governor Pad Cover

I would ask Mahlon (username MAHLON_R). Send him a PM.

Quote:
Originally Posted by pastranafan5 View Post
Does anybody know how I can get one of those covers?
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Fred Stucklen
wstucklen1@cox.net
RV-7A N924RV Flying (1825 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
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  #9  
Old 01-25-2017, 04:27 PM
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pazmanyflyer pazmanyflyer is offline
 
Join Date: Jul 2007
Location: Litchfield Park, AZ
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Default

Quote:
Originally Posted by pastranafan5 View Post
Does anybody know if this is a simple change or something that I shouldn't do? I'm thinking about getting a Catto prop for my constant speed O-320, so it would need to be changed.
See threads below for info that cover what you'd like to do.

http://www.vansairforce.com/communit...ad.php?t=86565

http://www.vansairforce.com/communit...prop+gov+cover

Prop gov. cover part #Lycoming 72378 or Superior SL72378
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Last edited by pazmanyflyer : 01-25-2017 at 04:33 PM.
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  #10  
Old 01-26-2017, 12:16 PM
cguarino cguarino is offline
 
Join Date: May 2005
Posts: 377
Default PM

pastranafan5, I sent you a PM. Thanks.
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