To Rebuild or Just Leave As Is

[PACub100]

Don't remove, or try to remove that exhaust elbow.....you don't need to!

Yeah, like he said...

Unless you have access to an acetylene torch, don't mess with it. I actually scored a cheap 1650 years ago due to this very reason. Previous owner tried removing the exhaust pipe with a hammer and broke the head. Lucky for me, he still had the large chunk broken off and my boss is experienced in welding cast iron.


As you mentioned before, you can get the pipe threaded and go from there putting a muffler on.

 

[Cody Crowley]

Thanks for all the great input! At this point I am going to leave it alone and try to thread a new muffler (one will be arriving tomorrow) onto the remaining thread and go from there. I already removed the lock nut by splitting with a chisel, so the worse that can happen is the elbow loosens once the engine is fired up…wouldn’t that be nice!

 

[PACub100]

Thanks for all the great input! At this point I am going to leave it alone and try to thread a new muffler (one will be arriving tomorrow) onto the remaining thread and go from there. I already removed the lock nut by splitting with a chisel, so the worse that can happen is the elbow loosens once the engine is fired up…wouldn’t that be nice!

That never happens unless you don't want it to come loose

 

[Cody Crowley]

I don’t want it to come loose!

 

[Cody Crowley]

Update on my Cadet 100 exhaust; after speaking with my friends at my tractor club, I went ahead and cut the pipe down shorter with the hacksaw and then used a hacksaw blade in a handle and cut a notch in the pipe lengthwise. I was then able to take a ball-peen machinist hammer to knock the two sections together, loosening the grip on the pipe. It unscrewed easily after that. Granted, I nicked the thread in the block but I am not concerned since this is the exhaust side of the engine and gases are going out anyways. I just need to flush the gunk and metal shavings with solvent (maybe Marvel oil or kerosene) and change the oil before starting it up. I have a new pipe, locknut and muffler to replace the old ones once the threads are cleaned up.

 

[dschwandt]

Now tha you have the piece out, run a pipe tap through the threads to clean them up

 

[Cody Crowley]

Now tha you have the piece out, run a pipe tap through the threads to clean them up

Yes, that will be my next step. It is a 1” tap, correct?

 

[dschwandt]

I believe so, yes

 

[Cody Crowley]

I believe so, yes

Excellent, that will be my next step before degreasing and paint! Thank you!

 

[dschwandt]

Yes, that will be my next step. It is a 1” tap, correct?

Use plenty of oil as it will help clean things out and suspend debris so they don't get puched through into the combustion chamber.
In and out, in and out repeatedly as needed while chasing the threads.