Exhaust Gaskets

Steve_S · Jul 21, 2015

On a '46 A, is it beneficial to put some gasket material between the manifold and exhaust pipe? The manifold surface isn't perfect so I was thinking some gasket in there might help seal.

Also does the exhaust pipe just sit up in the muffler in mid air or should something be packed between them?

old popper · Jul 22, 2015

No gasket necessary between manifold and exhaust pipe, and yes the exhaust pipe just sticks up into the muffler.
These were designed to be operated in the outdoor open air, and they are fine as designed.

Jo Bird · Jul 22, 2015

Yes, the A used exhaust gaskets under the manifold and at the exhaust pipe flange. I believe the pipe just slid up in side the muffler. For a complete break down Google the free JD parts on line website, search for model "A", select catalog 675 Model A, serial # 47700- , pg # 11, key #4 and #8 are the gaskets..

Edit

missed the cut off (serial number) was before that of a 46 (558817) so no key # 4 exhaust pipe gasket used after (487999).

Patsdeere · Jul 22, 2015

Agreed there is not supposed to be anything in there, but I sure would like to find something to put in there. Mine doesn't mate up real tight and it lets exhaust out which makes me cringe. I would think some type of high temp fabric could get squished in there, but don't know of a source (or if it is realistic). I guess the only other thing that could be done would be to smooth it out, like valve grinding so it sits in there nicely. Yeah the pipe just sticks up into the exhaust muffler.

Steve_S · Jul 22, 2015

Thank you gentlemen, very helpful. I found a sheet of exhaust gasket material from a big parts supplier but I guess I'm not allowed to say where? Anyway, the stuff is out there. I'll cut a donut from the sheet and try it at the pipe to manifold junction, and leave the upper part alone.

Just out of curiosity, would packing the upper junction between pipe and muffler create a back pressure problem? I wonder why they would leave such a large leak otherwise. I know it's an outdoor machine, but it seems like sealing this area would reduce a ton of exhaust noise and that would reduce fatigue after a long day in the saddle.

Rich Duane · Jul 22, 2015

On my tractors I use the old muffler cement that can be found at most auto parts stores. It has to be redone any time you take the exhaust pipe off.

Mike M · Jul 23, 2015

I tried some stuff (I think it was a rope like stuff for sealing wood stove doors) on my JD50 once to try and seal the pipe into the muffler leak to keep smoke off the hood ,but upon a hard pull it blowed out !

Exhaust Gaskets

Steve_S

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old popper

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Jo Bird

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Patsdeere

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Steve_S

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Rich Duane

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Mike M

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