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Separating IO-540 Standard flange Crankcase

 
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n5qg(at)verizon.net
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PostPosted: Wed Jan 18, 2017 4:11 pm    Post subject: Separating IO-540 Standard flange Crankcase Reply with 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


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TimRVator(at)comcast.net
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PostPosted: Sat Jan 21, 2017 3:36 pm    Post subject: Separating IO-540 Standard flange Crankcase Reply with quote

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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