1990 J exhaust bracket

[mhrivnak]

This metal tab broke between the clamp and the rubber "shock mount". But the diagram in the parts catalog doesn't look much like these parts. Can anyone confirm or corroborate that this clamp and metal tab are correct for a 1990 J? Should I just have a new metal tab fabricated like the one that broke, since it doesn't seem to be in the catalog? Or should there be different hardware here?

Thanks!

[N201MKTurbo]

25 minutes ago, mhrivnak said:

Should I just have a new metal tab fabricated like the one that broke

Yes.

[RJBrown]

The 88 J stored in my hangar did not have the middle piece that broke on yours. The clamp was bolted directly to the rubber piece.

unfortunately the rubber piece just broke on it. It was intact when I looked at it a month ago.

[RJBrown]

After looking at both pictures I believe the one I photographed is missing what broke on yours. It appears someone put it together wrong and it caused the rubber to tear on this one. 
your picture will help fix this one right,

thanks

[A64Pilot]

Exhausts won’t be perfect duplications of each other, that plus tolerances in rubber engine mounting etc may require a tab in some airplanes to line things up and not on another.

‘I woud cut myself another tab out of mild steel, or ideally Inconel if you have any laying around. SS is often so hard it will crack easier, but if you have any that’s half hard of less then sure go with SS

Edited June 13, 2021 by A64Pilot

[PT20J]

Usually the rubber piece breaks first. I would double check that the ball joint where the tailpipe attaches is free. If not, adjust the spring tension on the bolts. And it's not a bad idea to lube it with C-5A every so often.

Skip

[carusoam]

Odd… the rubber piece isn’t doing the job correctly…

So… while getting a new tab put on… check to see if the rubber Has lost its flexibility…

or was applying stress to the tab…

Lots of vibration magnified through that system…  the old tire may only last a decade or two…

PP thoughts only not a mechanic…

-a-

[mhrivnak]

The rubber was replaced last July with the legit part from Mooney and has about 100 hours on it. We replaced the metal piece today and re-positioned the clamp to hopefully put less side load on the whole setup. Thanks for the input!

[PT20J]

20 hours ago, mhrivnak said:

The rubber was replaced last July with the legit part from Mooney and has about 100 hours on it. We replaced the metal piece today and re-positioned the clamp to hopefully put less side load on the whole setup. Thanks for the input!

I looked at your photo again and it appears that the rubber piece is installed backwards: The clamp should be forward of where the rubber bracket attaches to the exhaust cavity. Mounting it forward will cut down on the flex which may be what is breaking things. Also, my clamp does not have a tang as shown in the drawing. The clamp bolt also attaches the clamp to the rubber piece. If it had a tang, the tail pipe would be too low and hit the cowl flap when it is closed.

If it were mine, I would reverse the rubber piece and move the clamp forward and try just attaching the clamp to the rubber through the existing holes (you'll need a longer bolt). While doing this I would check that the tail pipe ball joint moves freely and if not fix that. Then when everything is together, close the cowl flaps and check the fit. You might have to loosen the ball joint and rotate the pipe to get it away from the cowl flap. Once it fits like you want it tighten everything up and install the cotter pins.

Skip