mack88 Posted July 8, 2017 Share Posted July 8, 2017 on my 87 mack 350 4v it blows black soot when i first start it and if i rev it up it blows out more just wondering what causes this. Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/ Share on other sites More sharing options...
thomastractorsvc Posted July 8, 2017 Share Posted July 8, 2017 Over fuel. Does it roll black smoke when you get on it? Well those heavy exhaust particle cling to the inside of the exhaust and then when you shut down the pipe condensates and causes the particle to stick more than they cool and dry out becoming lighter and then when you start up it forces all the dry flakes out the pipe and all over your truck. could be pump is turned up, puff limiter not working properly or because it's 30 years old Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-374389 Share on other sites More sharing options...
mack88 Posted July 8, 2017 Author Share Posted July 8, 2017 Don't think its turned up puff limiter was unhooked when i bought it hooked it up but not sure if its working yes it dos smoke when you step on it it is 30 years old with 1.3 kms. truck is all origanal pretty mitty truck Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-374416 Share on other sites More sharing options...
david wild Posted July 8, 2017 Share Posted July 8, 2017 Spend a 150k no more smoke and the tree huggers will thank you, or don't give a hoot, pollute and keep on making money, I'd pollute just to piss off the tree huggers. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-374424 Share on other sites More sharing options...
mack88 Posted July 8, 2017 Author Share Posted July 8, 2017 Lol i'm to old school and to old to spend 150k and i like the smoke.New is nice but my hands are dirty most of the time. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-374430 Share on other sites More sharing options...
thomastractorsvc Posted July 9, 2017 Share Posted July 9, 2017 The puff limiter is a two part system the air valve on the intake and a piston on the end of the pump more than likely the piston on the pump is not working or shim properly. I hooked mine up with new valve and piston but the old piston had no shims. When I replaced the air valve it would never Rev up, like it took half the power away. So put the old valve back on and was going to order shims but never got around to it and put the new parts on Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-374481 Share on other sites More sharing options...
Hobert62 Posted July 19, 2017 Share Posted July 19, 2017 my B did this today when I put it away from the past weekend. I did end up blowing all the black snowflakes off the aluminum with shop air. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-375249 Share on other sites More sharing options...
Freightrain Posted July 19, 2017 Share Posted July 19, 2017 ^^Yup, looks like my garage ceiling. Only my pipes are like 6" away from the ceiling so it is really sooty. I get rained on with pellets of soot when I crank mine up. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-375269 Share on other sites More sharing options...
Hobert62 Posted July 19, 2017 Share Posted July 19, 2017 2 hours ago, Freightrain said: ^^Yup, looks like my garage ceiling. Only my pipes are like 6" away from the ceiling so it is really sooty. I get rained on with pellets of soot when I crank mine up. I turned the nuts on the rack 3 more flats and it made a big difference. Quote Link to comment https://www.bigmacktrucks.com/topic/50415-black-soot/#findComment-375283 Share on other sites More sharing options...
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