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Separating IO-540 Standard flange Crankcase

Matronics Email Lists Forum Index -> LycomingEngines-List

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n5qg(at)verizon.net
Guest

Posted: Wed Jan 18, 2017 4:11 pm Post subject: Separating IO-540 Standard flange Crankcase

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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TimRVator(at)comcast.net
Guest

Posted: Sat Jan 21, 2017 3:36 pm Post subject: Separating IO-540 Standard flange Crankcase

http://nickugolini.com/Website/CaseSplitter/case_splitter.htm



-- 

Tim Lewis -- HEF (Manassas, VA)

A&P

RV-6A N47TD -- 1104 hrs - sold

RV-10 N31TD -- 740 hrs



mark wrote on 1/18/2017 7:10 PM:

 	  Quote: 	
		  

 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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