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LycomingEngines-List Digest: 1 Msgs - 11/15/07

 
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capmrp(at)cfu.net
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PostPosted: Fri Nov 16, 2007 12:15 pm    Post subject: LycomingEngines-List Digest: 1 Msgs - 11/15/07 Reply with quote

Gents,

I am thinking of changing out the bushings in the prop flange on the
crank to allow clocking the c/s 2-blade prop to cut down vibrations at
cruise power. I have the procedure but since I have never swapped out
the bushings, I'm wondering if anyone out there can give insight.

1. Are the bushings oversize fit?
2. Are the sides of the bushings textured in any way in order to grip
the flange tighter ie: make it more difficult to remove?
3. Since the "special tool" for bushing removal/insall costs $1800
does anyone know of where I can borrow one or of other tools that will
work just as well?

Any insight would be appreciated.

Thanks.
Mike
capmrp(at)cfu.net


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flyinwithme99(at)yahoo.co
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PostPosted: Fri Nov 16, 2007 2:55 pm    Post subject: LycomingEngines-List Digest: 1 Msgs - 11/15/07 Reply with quote

The bushings are an "interference fit"
The bushings are not "textured", they are held in place by the above interference fit.

I have removed the bushings very easily by using a piece of tubing that just fits over the flange of the bushing on the back side of the crank flange, use a bolt, nut and a washer placed on the front side of the bushing where the washer is slightly smaller than the O.D. of the bushing, and simply using two wrenches to squeeze the nut bolt combination together will force the bushing from the crankflange.

Installation is done by using a bolt that fits the threads in the I.D. of the bushing and placing an appropriate piece of tubing on the front side of the crankflange, insert the bolt throught the tubing, crankflange, and screw into the bushing placed on the back side of the crankflange, pull the bushing into place by turning the bolt. Lightly oil all surfaces to keep from galling. The press fit is not real tight so it should go in easily.

Please be careful of what you may consider "proper clocking" of the prop to the crank. Use the information from the prop manufacturer if available, or call the prop manufacturer.

Manuel Weber
A&P

capmrp(at)cfu.net wrote:
[quote]--> LycomingEngines-List message posted by: capmrp(at)cfu.net

Gents,

I am thinking of changing out the bushings in the prop flange on the
crank to allow clocking the c/s 2-blade prop to cut down vibrations at
cruise power. I have the procedure but since I have never swapped out
the bushings, I'm wondering if anyone out there can give insight.

1. Are the bushings oversize fit?
2. Are the sides of the bushings textured in Get easy, one-click access to your favorites. [quote][b]


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jdhcv(at)yahoo.com
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PostPosted: Fri Nov 16, 2007 4:05 pm    Post subject: LycomingEngines-List Digest: 1 Msgs - 11/15/07 Reply with quote

It's pretty easy. Put a socket on the back sid that the bushing will fit through and use a c-clamp to push the bushing out. Hope this helps.

Jack

capmrp(at)cfu.net wrote:
[quote]--> LycomingEngines-List message posted by: capmrp(at)cfu.net

Gents,

I am thinking of changing out the bushings in the prop flange on the
crank to allow clocking the c/s 2-blade prop to cut down vibrations at
cruise power. I have the procedure but since I have never swapped out
the bushings, I'm wondering if anyone out there can give insight.

1. Are the bushings oversize fit?
2. Are the sides of the bushings textured in any way in order to grip
the flange tighter ie: make it more difficult to remove?
3. Since the "special tool" for bushing removal/insall costs $1800
does anyone know of where I can [quote][b]


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