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  #21  
Old 02-27-2017, 12:08 AM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
Default tie rods

A few comments:
Welding rod is usually under the nominal size so easier to thread but not as good a thread.
The holes in the baffles for the outboard rods can be moved 1/8 or so lower. Install a doubler with just two rivets and relocate hole.
With a proper joggle and proper tightening the rod will not contact the oil drain tube. Some of the rods in the pictures do not have enough joggle and/or are overtightened.
If you carefully shape the radius where the baffle contacts the cylinder fins the rods can be installed with less tension.
The allthread is an invitation to problems. The nylon tubing melts depending on the individual temperatures and then the allthread can saw thru the drain tube.
My preference is to make the rods from mild steel and either paint the non threaded portion or cad plate.
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  #22  
Old 02-27-2017, 08:26 AM
jwilbur jwilbur is offline
 
Join Date: Dec 2010
Location: Culpeper, VA
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Quote:
Originally Posted by Redrock View Post
Joe,
After looking at your pictures closer, I think you need offsets/jogs closer to where the return lines are. Just bend a relatively short section near the lines to go down and then back up near the tubes.
Thanks. Sounds like an easy solution. I'll try this.
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  #23  
Old 02-27-2017, 10:04 AM
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Redrock Redrock is offline
 
Join Date: Dec 2011
Location: Ogden or St George, Utah
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Quote:
Originally Posted by jrs14855 View Post
A few comments:.....
The allthread is an invitation to problems. The nylon tubing melts depending on the individual temperatures and then the allthread can saw thru the drain tube......
Hi Jim,
You raise some valid points and I check that area when ever the bottom cowl comes off for the reasons you've stated. I have 140 hours on the Hobbs now with no signs of melting or rubbing. That includes flying on many of those 100+ days we get out here in the high desert as well as a 50 minute taxi and hold at OSH last year (lousy thing to do to your engine!).
Regards,
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