Conical bushings on dynafocal mount

[rmhou at yahoo.com]

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:

http://www.greatplainsas.com/i71032.html

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.

https://picasaweb.google.com/1121043...68234383154386

https://picasaweb.google.com/1121043...68658826101362

https://picasaweb.google.com/1121043...68869924640962

https://picasaweb.google.com/1121043...69068741227522

https://picasaweb.google.com/1121043...69253420287490

https://picasaweb.google.com/1121043...69579336970610

[[email protected]]

On Mar 12, 1:36*pm, "rmhou at yahoo.com" > wrote:
> 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:
>
> http://www.greatplainsas.com/i71032.html
>
> 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.
>
> https://picasaweb.google.com/1121043...68234383154386
>
> https://picasaweb.google.com/1121043...68658826101362
>
> https://picasaweb.google.com/1121043...68869924640962
>
> https://picasaweb.google.com/1121043...69068741227522
>
> https://picasaweb.google.com/1121043...69253420287490
>
> https://picasaweb.google.com/1121043...69579336970610

The two systems are not compatible in any way. For a Dynafocal engine
you need a Dynafocal engine mount and shockmounts. Neither are cheap.
Any attempts to use the conical mounts on a Dynafocal setup could be
dangerous.

Dan

[Bob Kuykendall]

On Mar 17, 4:38*am, wrote:

> The two systems are not compatible in any way. For a Dynafocal engine
> you need a Dynafocal engine mount and shockmounts. Neither are cheap.
> Any attempts to use the conical mounts on a Dynafocal setup could be
> dangerous.

It's not what I would do, but it seemed to be safe enough for the
fifty or so PL-1Bs built in Taiwan in the 1970s.

Thanks, Bob K.