OldRedMack

Just ordered the engine harness from nextran in Atlanta. $933.00

M&d was good to deal with, but call them with your injector numbers. The website numbers don't always match up with what you need. You can buy as many or as few as you want. They are really only at there best efficiency for around 5k hours before you start losing some power and fuel efficiency. I don't replace the valve cover gasket unless it's ripped or torn. If it looks good just make sure it and the head surface is clean and smooth and you shouldn't have any problems with leaks.

It might be a good time to go ahead and put a set of injectors in it. In the grand scheme of things they are pretty inexpensive, about $100-$125 a piece depending on where you get them. In my experiences if the manifold stud is leaking they usually come out pretty easy cause they are sitting in an oil bath. Put a ratchet and socket on it and see if it turns.

I'm also a fan of the high range low hole on the 8ll when using at a yield or making a turn. A lot of options and ways to shift really a great transmission in a dump truck.

I'd love to know as well, I've had the same issue since we bought this truck.

2001 had the cam issues, ours has a cam job done every 3-4 years. Our 2, 94 rd with mechanical engines have well over a million miles and God only knows how many hours and we have never been into the engines. Still work every day going on 30 years as dump trucks.

Pressure check the intake, might have a blown intake manifold gasket.

Check your retaining nut on the drive shaft

You are only going to get 5k good hours out of a set of injectors. At 5500 hours I was down 3-4psi of boost, and now at 6400 I'm down 8-10psi. Got a new set ordered and waiting for delivery. If you search for those threads we have really good vendors to buy from listed as well.

The short of it, have it re-programmed to the 370hp setting it has more torque. Get an e7 exhaust manifold, a s400 turbo, and then the 427/460 injectors it will wake right up. I have a thread on the 370 and mack tech has 1 on the 460, same principles as both. I'm to computer illiterate to know how to link them.

Do you have a power wire going to a trailer connection that has a bare spot and is shorting out and tripping the breaker on the firewall when you hit a bump. Had that happen to me before.

Good chance you have a weak eup, that happened with me and new injectors. 1 eup wasn't strong enough for the new injectors, replaced it and all was good.

I chucked mine in the scrap bin. Use the old style and get an s400 turbo.

Only took about 2psi to find my blown gasket on the manifold, It doesn't take much. The key for me atleast is that it is quiet while you are doing it so you can hear the leaks.