Muffler rebuild/ New Jacket

[Jrain 276]

So I was going through the box of takeoff parts from my scrap yard C 120 build , I was looking at the rotted muffler and saw that it was really only the bottom half of the outer jacket that rotted out and the internals ( baffles )  and tail pipe were in pretty good shape ,so I decided to give her a new Jacket and a quiet upgrade to the sound. I first started with a piece of 22 gauge metal ,being I do not have a roller or a bead die  witch is what is really needed to get a factory finish I decided it might make a good DIY with hand tools only ,and being I have a feeling that most of these types of mufflers suffer from the same death of bottom rot due to moisture . 

 

So first I rolled the 22 ga. sheet metal to a 3.5 diameter with leaving a 1 inch overlap using a 3'' piece of pvc I had laying around , then I wrapped it around  what was left of the old muffler core ,before I wrapped it I applied rutt land 2000 degree stove/ furnace cement on the top and side seem using vise grips  firmly locked the jacket in place , the proceeded to rivet the new jacket seam and to the top section and then using the squeeze out of the cement to form a sealed bead along the seems , Now here might be the problem I do have a welder and I was trying to do this with simple hand tools only ,but I felt welding in the tail pipe would be the right choice , So i used a 1  1/4 hole saw to make the hole for the tail pipe and welded it in at the proper location for the stock fitment . after that I turned my attention to the bottom termination cap  for the muffler  ,  I used a  divider to mark a 4 inch diameter circle on the sheet metal then another mark line at 3 1/4 , then I cut out the sheet metal at the 4'' mark using tin snips the proceeded to make notches to my 3 1/4 mark , then bent the notches up 90 degree using needle nose pliers , now I turned my attention to the quiet upgrade , I had a old motorcycle baffle that was wrapped with fiberglass baffle packing  ,I removed the packing and wrapped it around the secondary baffle thinking that it would lower the noise a bid ,I could have really packed it in there but decided to only so a small wrap . after that was done I ran a bead of the stove cement around the end of the jacket and pushed in the termination cap 3/8 of a inch in to the outer jacket leaving me about 3/8 of a inch of the notched edge sticking out then proceeded to bend the notches over the jacket to lock the cap in place again taking my finger to smooth out the squeeze out of cement , I then drilled and riveted the cap in with 4 rivets . I would normally drill the rivets out and tack weld , but I want to see how they take to the expanding and contracting as the muffler heats up and cools down , So I just put a few tack welds here and there on side top and bottom connection seems . and lastly I brushed a few coats of high temp stove paint on the rebuilt muffler . the cost was 0 because I used what ever I had laying around .

[ebinmaine 67,498]

I'd be curious to know your thoughts on the sound level and depth after you've got it installed and run it for a bit

[Jrain 276]

On 8/4/2021 at 12:38 PM, ebinmaine said:

I'd be curious to know your thoughts on the sound level and depth after you've got it installed and run it for a bit

Well I can not compare it to the stock exhaust because when I got the tractor, the muffler was already in the rotted out state ,but after getting the tractor to running and useable condition ,I did need a muffler to get the carb set up properly ,  I  opted for the quick install of the cheep brigs  hamburger style muffler , If I compare it to that  I would say there is at least 30 to 50 percent in noise reduction  . Hope that helps.