Scorer128

the Pipe was blowing exhaust directly into frame rail. I have a couple pics I’m trying to get uploaded. Please bare with me

Thank you very much. Every bit of info helps. As you’ve stated deflecting exhaust heat is a concern. Any suggestions that will try to keep heat from the goings on in the frame rails? Or do you think that wasn’t necessarily a u model issue -but the lack of proper exhaust piping -which allowed the heat direct access ?? Knowing that will help decide how to proceed in that area Thank you again for your help !!

Thank you. Encouragement is probably the most of what I need. 😃

I am working through a nightmare I’m hoping someone here can help. I inherited my Daddy’s 1980 U model. I believe it was once a single bogie tractor converted to a six wheel dump. It has spent its last thirty years as a home for wayward rodents and waiting for its next job. Well I plan to use her to pull an equipment trailer and do small hauls but ..... the exhaust was hacked (my guess for parts) and melted the ground cable, airlines and frame wires causing a short that melted the wires and air lines in the dash. I think it sounds worse than it really is but I don’t remember the original layout of the exhaust. Or the size because there’s currently 4 5 and 6 inch pipe on it The r model wiring schematic I found for the most part helps me just that I can’t see any of the colors so I plan on re-wiring new harness. If anyone can give me the airline lay out, the exhaust layout and any help with familiarizing myself with a 1980 U model, it would be greatly appreciated. I plan on using this girl for many years to come in honor of my dad. I don’t plan on doing a complete re-store but would like to get close to original. Thank you advance for your help happy Trucking!!

Hello gentlemen. Thank you for such a wonderful informative Mack truck site. I recently acquired a 1980 U model Tractor converted to a six wheel dump truck that once belong to my dad. Although The truck has been decently taking care of it does have some issues that I’m hoping you’ll help me work out. I’m going to go read some articles if I have any questions I’ll be back