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Separating IO-540 Standard flange Crankcase

 
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flyinwithme99(at)yahoo.co
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PostPosted: Wed Jan 18, 2017 4:31 pm    Post subject: Separating IO-540 Standard flange Crankcase Reply with quote

There is a better way. I will send pics if the tools i used for years by the morning

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Quote:
On Wed, Jan 18, 2017 at 6:10 PM, mark
<n5qg(at)verizon.net> wrote:

I have IO-540-C4B5 engine that needs to be split and rebuilt for my RV-10 build project. I plan on machining new ST-122 pressure plates and 8 bolts/nuts to separate the engine case since Lycoming does not provide this tool anymore.

Does anybody have the dimensions of the Lycoming pressure plates ST-122 and the size of the bolts/nuts used to separate Lycoming crankcases. I understand the ST-122-2 bolts thread onto the crankcase Thru-Studs, plates installed both sides of the case with nuts & washers added to the ST-122-2 bolts to secure the plates. When the nuts are tightened down it causes the pressure plates push against the other Thru-Studs that are up against the inside of the pressure plates, causing the case halves to separate. Specifically, what is O/D of the ST-122-2 bolts, the inside depth the bolts are threaded to accept the Thru-Studs? Also, what size thread is on the outside of the bolts and nuts?

Any information regarding the ST-122 tool will be gratefully appreciated.

Mark
Ft. Worth, Tx



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ejharris813wk(at)comcast.
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PostPosted: Wed Jan 18, 2017 7:11 pm    Post subject: Separating IO-540 Standard flange Crankcase Reply with quote

Mark
Google st122tool and rent it for 125$
Sent from my Verizon Wireless 4G LTE smartphone

-------- Original message --------
From: mark <n5qg(at)verizon.net>
Date: 01/18/2017 7:10 PM (GMT-05:00)
To: lycomingengines-list(at)matronics.com
Subject: LycomingEngines-List: Separating IO-540 Standard flange Crankcase

<![endif]--> <![endif]-->
I have IO-540-C4B5 engine that needs to be split and rebuilt for my RV-10 build project.  I plan on machining new ST-122 pressure plates and 8 bolts/nuts to separate the engine case since Lycoming does not provide this tool anymore.
 
Does anybody have the dimensions of the Lycoming pressure plates ST-122 and the size of the bolts/nuts used to separate Lycoming crankcases.  I understand the ST-122-2 bolts thread onto the crankcase Thru-Studs, plates installed both sides of the case with nuts & washers added to the ST-122-2 bolts to secure the plates.  When the nuts are tightened down it causes the pressure plates push against the other Thru-Studs that are up against the inside of the pressure plates, causing the case halves to separate.  Specifically, what is O/D of the ST-122-2 bolts, the inside depth the bolts are threaded to accept the Thru-Studs?  Also, what size thread is on the outside of the bolts and nuts?
 
Any information regarding the ST-122 tool will be gratefully appreciated.
 
Mark
Ft. Worth, Tx 


- The Matronics LycomingEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?LycomingEngines-List
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