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Got the eccentric pulley bolt off.= Took a 3/4=E2=80=9D 18mm high impact socket, a 4=E2=80=99 3/4=E2=80=9D stee= l breaker bar, 1 4=E2=80=99 pipe extension on said breaker bar, a 4=E2=80=99= pipe extension on the flywheel 4=E2=80=99 =E2=80=98holding=E2=80=99 bar, an= d a backhoe to hold the flywheel bar down. The steel breaker bar deflected a= t least 4=E2=80=9D on the shaft till the bolt popped loose. I thought it mig= ht break!

This is the worst I have found rebuilding several 13B en= gines.

I didn=E2=80=99t have enough 1/2=E2=80=9D air supply f= or the huge 3/4=E2=80=9D IR air impact wrench I had, and doubt that would ha= ve worked. And it=E2=80=99s rated at 1225 ft lbs.

M

<= div dir=3D"ltr">Sent from my iPad

On Mar 21, 2023, at 1:57 PM, flyrotary@lancaironline.net wrote:

=EF=BB=BF=
Marc,

I found a torque wrench with 900 ft lbs o= f torque will get it off without having to wrestle a rotating engine block.&= nbsp; I struggled as you did and found this always worked for me. A to= ol rental place should have one. Works well on the flywheel nut as wel= l.

Ed

------ Original Message ------

=46rom "Marc Wiese cardmarc@cha= rter.net" <flyrotary@l= ancaironline.net>

To "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Date 3/20/2023 4:05:39 PM

Subject [FlyRotary] eccentric shaft pulley bolt removal

<= /div>

Fellows,
Been trying to tear down an extra FD e= ngine and I=E2=80=99m having a devil of a time getting the front pulley ecce= ntric bolt off. The flywheel nut has already been removed. I did put the cou= nterweight and flywheel nut back on to be able to bolt a bar to the counterw= eight to keep the eccentric shaft from turning when trying to get the eccent= ric bolt off. Here is what I have tried so far: breaker bar extension pipe (= +3=E2=80=99); propane torch on bolt for 2 min to break any sealant (?); impa= ct wrench-nada; sledge hammer on breaker bar; solvent.
Nothing worked. The engine just lifts off the floor with more torque. Does i= t take a gorilla to get this nut off???
Any ideas how t= o get this dam bolt off?
M

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