Rubber Bushing Replacement

[Boelkowj]

I have a 0200A Continental engine with total hrs (600hrs) and thinking maybe I
should change out the rubber engine mount bushings only because they have been
on the plane for 25+ years. They look fine but maybe a little sag on the bottom
ones. Is this usually just an eye ball assessment or a "must do" item based on
#years on the plane?

Thanks.Larry

[Dan Thomas]

(Boelkowj) wrote in message >...
> I have a 0200A Continental engine with total hrs (600hrs) and thinking maybe I
> should change out the rubber engine mount bushings only because they have been
> on the plane for 25+ years. They look fine but maybe a little sag on the bottom
> ones. Is this usually just an eye ball assessment or a "must do" item based on
> #years on the plane?
>
> Thanks.Larry

The rubber must be getting a bit hard by now. New ones would smooth
things out some, and bring the engine up into proper position.
But that engine: 25 years and 600 hours is not good. I suspect it
could have corrosion problems that might bring more grief than old
mount rubbers.

Dan

[Boelkowj]

Maybe so but it was "pickled" for over 10 years and has been performing
flawlessly ever since in So. Cal.

Larry

[Larry Smith]

"Dan Thomas" > wrote in message
om...
> (Boelkowj) wrote in message
>...
> > I have a 0200A Continental engine with total hrs (600hrs) and thinking
maybe I
> > should change out the rubber engine mount bushings only because they
have been
> > on the plane for 25+ years. They look fine but maybe a little sag on the
bottom
> > ones. Is this usually just an eye ball assessment or a "must do" item
based on
> > #years on the plane?
> >
> > Thanks.Larry
>
> The rubber must be getting a bit hard by now. New ones would smooth
> things out some, and bring the engine up into proper position.
> But that engine: 25 years and 600 hours is not good. I suspect it
> could have corrosion problems that might bring more grief than old
> mount rubbers.
>
> Dan

Maybe the rubber shocks saw service with other engines? But no way the
rubber is doing its job after 25 years.

[Wallace Berry]

In article >,
(Boelkowj) wrote:

> I have a 0200A Continental engine with total hrs (600hrs) and thinking maybe
> I
> should change out the rubber engine mount bushings only because they have
> been
> on the plane for 25+ years. They look fine but maybe a little sag on the
> bottom
> ones. Is this usually just an eye ball assessment or a "must do" item based
> on
> #years on the plane?
>
> Thanks.Larry

Some people change these at every annual inspection. They are dirt
cheap.

[Boelkowj]

I think you are correct about changing them out. I was told it would require
taking the engine off. Is there a cleaver trick to change them without a total
dismount? Thanks.

Larry

[Bela P. Havasreti]

On 11 Dec 2003 16:17:17 GMT, (Boelkowj) wrote:

You don't have to take the engine all the way off. Just hook the
engine up to a hoist and put slight tension on the support/hook.
Loosen all 4 engine mount bolts and then change 2 bushings at a time
(top two, then bottom two for example). To do this, remove the top
motor mount bolts and lower the engine with the hoist slightly to make
room to change the top bushings, replace the top motor mount bolts
(don't tighten them yet), then remove the lower mount bolts and raise
the engine slightly with the hoist to make room to change the bottom
bushings, then replace the bottom mount bolts and finally tighten /
torque all 4 bolts.

There should be enough slack in whatever hardware attaches from the
firewall to the engine and ancillaries to facilitate bushing
replacement in this fashion.

Bela P. Havasreti

>I think you are correct about changing them out. I was told it would require
>taking the engine off. Is there a cleaver trick to change them without a total
>dismount? Thanks.
>
>Larry

[Boelkowj]

Thanks a bunch Bela.. That is just what I wanted to hear.. New rubber here we
go..

Larry

[Dan Thomas]

Wallace Berry > wrote in message >...
> In article >,
> (Boelkowj) wrote:
>
> > I have a 0200A Continental engine with total hrs (600hrs) and thinking maybe
> > I
> > should change out the rubber engine mount bushings only because they have
> > been
> > on the plane for 25+ years. They look fine but maybe a little sag on the
> > bottom
> > ones. Is this usually just an eye ball assessment or a "must do" item based
> > on
> > #years on the plane?
> >
> > Thanks.Larry
>
> Some people change these at every annual inspection. They are dirt
> cheap.

Some are dirt cheap. Some aren't. There's no way to tell without
getting some quotes. The Barry mounts for an O-320 are $125 each,
genuine Lord mounts can be $160 or more. That's for each mount;
multiplied by four, it starts to add up. The O-200 mounts should be
less, but won't be anywhere near as low as the $4 rubber used in the
A-65 mount, for example.

Dan