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Old 03-12-2012, 01:27 PM
RobinHou RobinHou is offline
Join Date: Mar 2009
Location: Pasadena, California
Posts: 214
Default Conical bushings on dynafocal mount

This is not a RV but a Pazmany, so I hope this post does not violate any posting rules. If it does, please remove it.

We are replacing sagging bushings in my friend's Pazmany PL-1B. The engine is a 150hp O-320 with Dynafocal mount, but we are not sure what type (I or II). However, the airframe engine mount has cups looking like engine block conical mount using bushings looking like Lycoming 71032.

71032 bushings have .5" hole but the mounting bolts are .402" like the ones used with Dynafocal engine mount with large cups. We are thinking using some type of metal sleeves over the bolts so the bushings do not deform too much under compression. I fount the following online from Great Plains website:

However, Great Plains uses .5" OD with 3/8" ID metal tube as sleeves since it uses AN6 bolts (.371-.374"). Our bolts at .402" are not going to fit.

Is this a standard Lycoming installation? If so, is there a Lycoming kit (bushings, bolts, washers, sleeves, ...) to correctly mount this Dynafocal engine to its engine mount with conical cups? Part no. for the kit?

If not, any suggestion on how to correctly install these bushings is welcome.

Last edited by RobinHou : 03-12-2012 at 01:30 PM. Reason: fixed links
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Old 03-12-2012, 02:13 PM
rocketbob's Avatar
rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
Posts: 3,830

No this is not a standard dynafocal Lycoming install but it is rather clever, since the conical bushings are far less expensive. They look like standard conical mount bushings to me.

Please don't PM me! Email only!

Bob Japundza CFII A&PIA
N9187P PA-24-260B Comanche, flying
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Not a thing I own is stock.
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Old 03-12-2012, 03:31 PM
Bob Kuykendall's Avatar
Bob Kuykendall Bob Kuykendall is offline
Join Date: Sep 2006
Location: Vallecito, CA
Posts: 596

The dimension 0.402" does not correspond to any standard dimension US or metric hardware. Not any I know of, anyway. I think that there is something strange going on here.

Thanks, Bob K.
Bob Kuykendall
Low-drag wingtips for RV-4 through RV-8
EAA Technical Counselor
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