At the dealer you very seldom ever saw a tractor with a muffler but if one is used probably a straight through one would have little back pressure. The parts book lists a couple styles for the D4.
SJ is right. . .if a muffler is used it should be a straight through like a glass pack. Also, if you don't want a muffler a spark arrestor by itself quiets 'em down quite a bit.
I ran my D2 5U for years with various stacks and never a muffler with no problem. My D4 7U came with a short stack with a rain trap. When that blew apart I ran one season with a short stack and knocked out my hearing. That was back in '86 (huh?). Now I run a big ol' muffler on it and hearing protection if I can find it.
Tom
I built one for my 7U. Runs a fair but quieter. Doesn't seem to perform any different.
[img]http://img190.imageshack.us/img190/3600/fletcherd4260.jpg[/img]
[img]http://img36.imageshack.us/img36/7521/fletcherd4302.jpg[/img]
[quote="Glum"]I built one for my 7U. Runs a fair but quieter. Doesn't seem to perform any different.
[img]http://img190.imageshack.us/img190/3600/fletcherd4260.jpg[/img]
[img]http://img36.imageshack.us/img36/7521/fletcherd4302.jpg[/img][/quote]
That tractor is a beauty.........can you post up more pics......I would like to see that thing all the way around
I bought a muffler for my D47U from the Cat dealer. It lowered the noise level to about half of what it was. I still wear hearing protection when I run my D4. The pony motor is now the noisy one that I am putting up with. I am just glad that the Diesel engine starts quickly enough so I can shut the pony down ASAP.
What's inside of the muffler?
Thanks!
Steemer, try a rain trap on the pony pipe, it makes a world of differance.
Power Stroke,
Here's a link to some pics I posted on the acme board some time back.
http://www.antiquecaterpillar.net/ACF_v2/showthread.php?t=15412
Drujinun, on mine the pipe is blocked off inside, with heaps of small holes on either side of the plate that blocks it off. Surface area of the holes on each side is greater than the area of the pipe to try and minimize restriction of the emissions.
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