Mailing List flyrotary@lancaironline.net Message #57459
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] E-Shaft Lock Bolt HELP!
Date: Sat, 11 Feb 2012 18:26:49 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Not reverse threaded  - normal right hand threads.  If there is any play at all in the arrangement you are using to keep the shaft from turning - its going to be tough to loosen the bolt.  Normally, I have found a impact wrench will do it on the front bolt - but as I said if you have any play in holding the pulley or if the pulley has any play on the shaft (bolts a bit loose), it seems to ... ah hem ... lose its impact (pun intended).
 
You say you don’t' have flywheel - then is there anything you could clamp the counter weight retaining nut (the big one on the other end of the engine) into that will prevent it from rotating? 
 
I've never tried to remove the front bolt without restraining the flywheel - but, there must be a way, perhaps one of the other guys can be of some help.
 
Good luck.
 
Ed

Sent: Saturday, February 11, 2012 5:48 PM
Subject: [FlyRotary] E-Shaft Lock Bolt HELP!

I am tearing down a 13B (1st time) and have spent the last few hours trying to remove the eccentric shaft lock bolt.  Is there some secret to it that someone can share?  I don’t have a flywheel for the engine so I am holding the shaft with a pipe wrench on the pulley boss.  I have bent the handle on my 3/8 drive ratchet and couldn’t break it with a 24” breaker bar and a 5’ extension.  I cranked-up my compressor and couldn’t do it with my impact wrench.  I tried turning clockwise to convince myself that it isn’t reverse threaded.  I would try heating but my torch won’t stay lit for some reason (another thing to fix).

 

Does anyone have a magic trick to get past this hurdle? 

 

Is there any reason that holding the pulley boss would prevent the lock bolt from turning?

 

Any and all suggestions are appreciated.

 

Gordon C. Alling, Jr., PE

President

acumen Engineering/Analysis, Inc.

 

540-786-2200

www.acumen-ea.com

 

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