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Separating IO-540 Standard flange Crankcase

Matronics Email Lists Forum Index -> LycomingEngines-List

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flyinwithme99(at)yahoo.co
Guest

Posted: Wed Jan 18, 2017 4:31 pm Post subject: Separating IO-540 Standard flange Crankcase

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



Sent from Yahoo Mail on Android

 

  	  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.
Guest

Posted: Wed Jan 18, 2017 7:11 pm Post subject: Separating IO-540 Standard flange Crankcase

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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