diggin dirt Posted May 13, 2012 Share Posted May 13, 2012 i recently aquired a 1980 mack engine and tranny (6 speed 2 stick) and it has an air line coming from the intake manifold via the puffer valve. it also has 2 wires hooking on some object on the housing that operates hi-lo-reverse. what could these be for? Quote Link to comment https://www.bigmacktrucks.com/topic/25084-air-and-electrics-going-to-80-mack-6-speed/ Share on other sites More sharing options...
Glensts Posted May 13, 2012 Share Posted May 13, 2012 I had a 1980 Mack with 300+. I'm going to say the 2 wires are for the reverse lights circuit on the transmission. As for the puffer valve air lines, mine was unhooked, did they not need the turbo manifold pressure to reach a certain psi before full fuel was given? I'm thinking that is what the purpose of the air line Quote Link to comment https://www.bigmacktrucks.com/topic/25084-air-and-electrics-going-to-80-mack-6-speed/#findComment-119164 Share on other sites More sharing options...
diggin dirt Posted May 21, 2012 Author Share Posted May 21, 2012 yes, back up lites, makes good sense. i wondered if they were limiting full fuel in reverse to help protect drive line? thank you Quote Link to comment https://www.bigmacktrucks.com/topic/25084-air-and-electrics-going-to-80-mack-6-speed/#findComment-120511 Share on other sites More sharing options...
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