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  #1  
Old 11-27-2017, 09:33 PM
pilot2512 pilot2512 is offline
 
Join Date: Aug 2007
Location: Spring, TX
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Default Splitting Lyc case, bolt under cam gear...

Almost ready to split case on O-320. There is a nut under the camshaft gear that I cannot get a wrench on. Is there a special tool for this? Do I need to modify some kind of wrench? Then how do I torque it again later? Any ideas?

Jay
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  #2  
Old 11-27-2017, 09:39 PM
krwalsh krwalsh is offline
 
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Default Cylinder wrench

Use one of the cylinder base nut wrenches. You may have to grind down the outside diameter a bit, but it should work.
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Last edited by krwalsh : 11-28-2017 at 08:42 AM. Reason: Spelling
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  #3  
Old 11-28-2017, 06:16 AM
mahlon_r mahlon_r is offline
 
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Default

offset box end wrench works too.
Good Luck,
Mahlon
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  #4  
Old 11-28-2017, 08:07 AM
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I attended a Lycoming disassembly/assembly forum at Airventure years ago and when addressing the nut in question the top man stated that that nut is torqued to "GNT" specs or "Good and tight". His exact words. No way to get any type of accurate torque reading so snug it up tight. And don't forget to safety the nut after its "torqued"! I used one of the cylinder wrenches to loosen/tighten the nut IIRC.
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  #5  
Old 11-28-2017, 09:47 AM
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Low Pass Low Pass is offline
 
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Just did that with my recent overhaul. $5 wrench from Northern Tool. Ground the top and bottom of the neck down and heated with a propane torch to dull red. Bent, cooled, ready to use in just a couple of minutes.

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  #6  
Old 11-28-2017, 10:31 AM
pilot2512 pilot2512 is offline
 
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Cylinder base wrench worked great. Lots of swings with a rubber mallet later and both halves are split.

Thanks for all the help.

Jay
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  #7  
Old 11-29-2017, 05:03 AM
jrs14855 jrs14855 is offline
 
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Default Case

One should use some kind of case splitting tools. Home made tools can be made that bolt to the cylinder studs and push against two crank throws with a threaded rod into a fixed nut at each location. Aluminum spacer shaped to fit the crank throws to prevent crank damage.
There are much better tools commercially available but a lot pricier.
One should also have the tools shown in the OH manual for joining the case halves back together.
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  #8  
Old 11-29-2017, 10:28 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by jrs14855 View Post
One should use some kind of case splitting tools. Home made tools can be made that bolt to the cylinder studs and push against two crank throws with a threaded rod into a fixed nut at each location. Aluminum spacer shaped to fit the crank throws to prevent crank damage.
There are much better tools commercially available but a lot pricier.
One should also have the tools shown in the OH manual for joining the case halves back together.
The Lycoming school has a home-made slide hammer that works great for this. They welded a socket that fits the large through-studs on to a regular slide hammer. You screw it on the studs, and bang away, pulling the studs. Then remove all the case edge bolts (including the one behind the cam gear!), and the case pretty much falls apart.

Paul
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  #9  
Old 11-29-2017, 11:39 AM
Allen Barrett Allen Barrett is offline
 
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Quote:
Originally Posted by Ironflight View Post
The Lycoming school has a home-made slide hammer that works great for this. They welded a socket that fits the large through-studs on to a regular slide hammer. You screw it on the studs, and bang away, pulling the studs. Then remove all the case edge bolts (including the one behind the cam gear!), and the case pretty much falls apart.

Paul
Unless it's a doweled case
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