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Prop Bushing`damaged??

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Drippy

Well Known Member
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/3...sMEzOUIJux117HoSY7lpKNGqouCnLSBN=w640-h480-no

https://lh3.googleusercontent.com/c...ok5nNx9nknnq2-rT7_hJs5VG4rIimuss=w480-h640-no
https://lh3.googleusercontent.com/t...-gihP7Sia_dyk0WgBmu4Ysm0oO8dpAI0=w480-h640-no

AF1QipPbSzqWLRKBcIXhNNlL3WUi_tSm2XlXIHdwhrUc
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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
 
Prop bushings

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
 
cajunwings said:
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
Click to expand...

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.
 
Thanks

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.
 
Drippy said:
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.
Click to expand...


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.
 
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Thanks

Gil,

Thanks glad I asked!

When you say measure the bushing what sizes am I looking at the length?
 
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
 
tim2542 said:
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
Click to expand...

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.
 
Glad I looked

OK this whole (hole) thing has been a pain in the butt, but right now I am glad as it made me look closer at my bushing. It appears two (2) of them are not flush with the back of the flange. See photo. I tried to pull them in but they don't seem to budge and started to deform the washer I was using to bridge the gap across my stacked 1" washers. How hard should I be cranking to move the bushings in place.

Second issue is my stud is still stuck in the bushing. I tried cutting a slot in the back and putting a 1/8 piece of steel across to turn it and ended up bending the steel (not hardened). I tried a little heat on the bushing, but haven't gotten to crazy yet. I was thinking about getting a hardened chisel or something and putting it across the slot I added to the back of the stud to turn it out. next step might be to drill a hole and try an extractor on the path to drilling this thing out.
https://lh3.googleusercontent.com/Z..._rigOKiErg71K3uOtpf7ZX9LsyBEiESw=w480-h640-no
https://lh3.googleusercontent.com/K...pTRvUE6X6VF4Cv-mnFWJMwp427f5mbJk=w480-h640-no
https://lh3.googleusercontent.com/P...SvxGUCMyPWRxuWqy2j5xKtUzSe9b4rNw=w640-h480-no
 
Bushing

What ever you do don't heat it or turn it! Just for grins shoot it with WD-40 or BP Blaster then take a slightly larger socket than the back of the bushing then a large C-clamp and push it into the socket. To install just reverse.
Bob
 
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