From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Dave [david.staten@gmail.com]
Sent: Saturday, February 11, 2012 11:07 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: E-Shaft Lock Bolt HELP!

Heres the secret.......... You need a BIG impact wrench.

I had the same problem. I tried using a 3/8 impact and let it run on forever.. never budged it. Tried a 5 foot cheater pipe on a breaker bar.. ended up just moving/levering the engine instead of messing with the bolt...

Ended up going to the pawn shop and getting a BIG impact.. I think it had a 3/4" drive lug on it.....

one pull of the trigger for half a second and it zipped off. You should be able to find one in a pawn shop for under $100 usd.

2/11/2012 5:24 PM, Chad Robinson wrote:

I don't understand what you mean when you say you're removing the e-shaft lock nut by turning the pulley boss and you don't have a flywheel. The flywheel nut is the high-torque 54mm beasties on the outside-threaded end of the shaft. Then there's a 90lb or so bolt with a much smaller head on the other end. What are you removing? Pics?
--
Sent from my cell. Please excuse my brevity.

Gordon Alling <gordon@acumen-ea.com> wrote:

I am tearing down a 13B (1^st 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