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Thread: Another muffler rebuild.

  1. #1
    Supporting Member Frank S's Avatar
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    Another muffler rebuild.

    While replacing the tired old engine with a brand new one on the 30+ year old John Deere lawn tractor I needed to do something about the muffler.
    My first inclination since it is a new engine was to order a new muffler as well, but the customer decided he didn't want to spend the money for a new one and have to wait a month to get it. even knowing my labor could run as much to rebuild the old one as it would cost for a new one, but what do I care. I'm fairly certain I could have located one for a lot less than he had been quoted by 4 different sources.
    So here is how I rebuilt it as such.
    First I had to clean enough rust away to be able to administer the repairs. then I refitted the manifold tube to the muffler by welding a disk over the hole.
    since the insides were gone as well to give it some muffling ability I decided to pack it with lathe and drill swarth. This is akin to packing a muffler with steel wool to diffuse the exhaust flow but will last 100 times longer.
    Then after all repairs were made I sandblasted it with the coal slag and painted it with 2 coats of an extreme temperature paint. good for up to 1800f. The paint is temperature cured. the same paint I used when I rebuilt my wood stove 6 years ago and that stove still looks the same as it did way back then
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  3. #2
    Supporting Member Frank S's Avatar
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    Ed came and picked up his lawn tractor yesterday. When he cranked it up the first thing he asked was what the heck did I do to the muffler, said it has never been that quiet. In my opinion it was no quieter than a new muffler would have been, truth be told probably not as quiet but he had been running the old tractor for so long with a busted muffler, to him it sounded like the difference between a Dodge diesel pickup with straight pipes and a new Cadilac. As long as he was happy I am satisfied

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