Prop Bushing`damaged??

[Drippy]

Looking for some help I went to reinstall my Hartzell 2 bladed prop this weekend and one of the retained attachment studs went in "hard" I ended up shearing the roll pin that holds the captured nut in place.

After getting the prop back off - I was able to get the stud out and saw some damage to the first 1/16 of an inch of thread. I chased with a 1/2 by 20 tap and wanted advice on leaving the bushing or replacing it.

Hopefully the photos come through, first time attempting to upload images to this page.

If it will help I will try to get a photo of the threads tonight.

Thanks

https://lh3.googleusercontent.com/3F...N=w640-h480-no

https://lh3.googleusercontent.com/cq...s=w480-h640-no
https://lh3.googleusercontent.com/tU...0=w480-h640-no

`

[stancaruthers]

REPLACE
Easy Peasy
Get a stack of washers and jack it out with bolt, then reverse process with new one.
I used 1/2"-20 socket cap screw grade 8

[cajunwings]

I've bought good used serviceable ones from Aircraft Specialty Services in Tulsa for a very reasonable price.

Don Broussard

RV9 Rebuild in Progress
57 Pacer

[az_gila]

Originally Posted by cajunwings

I've bought good used serviceable ones from Aircraft Specialty Services in Tulsa for a very reasonable price.

Don Broussard

RV9 Rebuild in Progress
57 Pacer

Your local engine rebuild shop should have many bushings. They take them off crankshafts before they are scrapped.

Check the markings on them first. If there is a "P" and a number then it is an oversize bushing.

[Drippy]

Guys

thank you very much for the feedback couple of quick questions and a bit of a read-back to ensure I have it correct.

1) so I put a bolt through the damaged bushing, stack a bunch of washers around the bushing on the front side of the flange add a nut and washer to the back and start turning until the bushing pulls out forward?

2) getting it back in how do I know it is all the way in and not to far?

3) any special word on ordering the right bushing? the Lycoming parts book calls our 3 types long, short and indexing. Looking at them I have one bushing that is out further from the flange (forward) and 5 that appear flush? the damaged bushing is 1 position clockwise to the right of the bushing that protrudes forward as seen from the cockpit.

[az_gila]

Originally Posted by Drippy

Guys

thank you very much for the feedback couple of quick questions and a bit of a read-back to ensure I have it correct.

1) so I put a bolt through the damaged bushing, stack a bunch of washers around the bushing on the front side of the flange add a nut and washer to the back and start turning until the bushing pulls out forward?

2) getting it back in how do I know it is all the way in and not to far?

3) any special word on ordering the right bushing? the Lycoming parts book calls our 3 types long, short and indexing. Looking at them I have one bushing that is out further from the flange (forward) and 5 that appear flush? the damaged bushing is 1 position clockwise to the right of the bushing that protrudes forward as seen from the cockpit.

1. No, the bushing pushes out backwards toward the back of the engine

2. There is a flange on the back side of the bushing that will sit against the prop flange.

3. Easiest thing is to measure the bad one after it is removed.

[Drippy]

Gil,

Thanks glad I asked!

When you say measure the bushing what sizes am I looking at the length?

[az_gila]

Originally Posted by Drippy

Gil,

Thanks glad I asked!

When you say measure the bushing what sizes am I looking at the length?

Sizes and part numbers here -

https://www.lycoming.com/sites/defau...20Location.pdf

[tim2542]

Of course you are aware that one of the bushings is the "indexing" bushing and has a slight shoulder for the thickness of the ring gear support assembly (flywheel) to index the flywheel to the crank. Just in case you didn't know.
TimAndres

[az_gila]

Originally Posted by tim2542

Of course you are aware that one of the bushings is the "indexing" bushing and has a slight shoulder for the thickness of the ring gear support assembly (flywheel) to index the flywheel to the crank. Just in case you didn't know.
TimAndres

I'd rather describe the "odd one" as fitting into a slightly bigger hole in the prop flange - typically 0.030 larger diameter.

All listed in the Lycoming SI link.