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 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 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 Share on other sites More sharing options...
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