JoeH

My books go through 1986 or so, which is about when my dad bought our first Mack, (1979 R686ST) which we are still beating on today. He learned from a mechanic in his younger years don't try to remember specs. Look them up. Which is probably why he bought the binders. They cover everything from injection pumps to camelbacks. V8s, 2vh end673 to 4vh e6's. Frame repair, cab, oil and filter air cleaners, transmissions, bogies...

Back to my original post, it was the supply line my dad cracked on the pump and got nothing. Shut down lever has resistance, so we're looking at algea. We've had algea issues before in other equipment that's sat, I just misunderstood which line my dad cracked.

It's 4 studs that protrude out of the adapter that the pump mounts to.

Here is my Mack book. Robert Bosch is mentioned up front in every engine book I have in binder #1, both 2vh and 4vh engines. American Bosch is mentioned through 1983 and then in 1984 American Bosch became "United Technologies Diesel Systems". My engine books even have V8 info in them too. There's a sneak peek of binder #1 for you. And the casting number on the Robert Bosch adapter.

I think you'll note in the picture that the front of the pump actually is 4 bolts. But they use an adapter that uses a 3 bolt pattern to bolt to the block. You can just see one of the bosses on the pump side of the adapter. I can double check later to make sure I'm right, but I believe all endt pumps have an adapter section between them and the block.

I do believe this is a Robert Bosch mounted on a 1976 endt676 inside my retired 1980 DM686SX.

And this one.

No dice on a vintage truck rolling coal in black n white. But I found this!

Yes the vacuum sucks EVERYTHING out. Humidity, freon, oil... It puts a vacuum on the system for a half hour or something. Then the tech switches it over to fill it up. When I had my car AC fixed 2 years ago the compressor was worn out, wasn't effective at moving the freon, even though it had a full charge.

I've got three 2 valve endt676 engines, two have one brand and the third has the other brand. My crane has an endt675, not sure if it has same pump as the U model, doesn't make a difference to me so long as they start and do what I tell them!

Is this both American and Robert Bosch pumps?

Need it for yard work this week.

😭 Got this bad boy started up, hasn't run in a few years, was last on the road for snow work in '02, but we have started it and moved it once every 5 years or so. (I think Rob had one of these posts recently about how auto guys make a huge deal about starting their gassers for the first time in 2 years, deisel guys just drop a battery in and hit it!) Started and ran good, shut it off after a few minutes. A couple hours later it won't start! Cranks good, but isn't getting fuel. We cracked the return line off the injection pump and don't get any fuel gushing out when we crank it. Did I read somewhere recently that the fuel shutoff rack can stick internally? Could this be the cause? I can almost guarantee the fuel filters haven't been changed since the 90's, we're going to start there. No hand primer pump on the truck, we'll have to pick one up. Suggestions? 1976ish U685T.

You're supposed to put an AC vacuum machine on the system first, and use the same machine to pump freon and oil into the system. Atmosphere humidity has gotten into the system from being apart, it will rust your compressor and in a year or so it will seize, and when your AC kicks on the belt will slip on the compressor pulley and you'll eat belts. Other people may have done it and been fine but I got one year out of the AC on my dodge 2500 before the above happened. Had to buy a non-AC belt to run the bypass belt route.

Your granddaddy was rolling on low profiles before low profiles were hip.

As of last December they couldn't do the splay. We were pricing out reframing our DM686SX. Belly they could do, but not the splay.

You can buy rails from your Mack dealer, so somebody is making them...

Lol put a basket on the end of that and use it for treework. That ladder is massive.

Even still, DM frame may be different. My DM (it's a double frame) frame is about 13-15? inches tall for the first couple feet behind the cab, then it tapers to 11 inches for the rest. If you only need straight rails you could contact PG Adams. They make frame rails. But they unfortunately can't do the R model splay around the engine and trans.

I've driven a propane powered propane delivery truck, while the novelty of it was fun it just wasn't a diesel. Had to be careful about over revving. Not like a diesel where you mash it to the gov. Strange to make the transition in a truck from diesel to propane or CNG for that reason. No thanks on CNG. No thanks on batteries either - I like my fossil fuels. I'm an addict I suppose...

It's a glider. The endt tip turbine motor wasn't used anymore in 88, they had gone to the E6 4valve. Forgot about the dynatard!

endtB? What's the B stand for? I know DT is diesel, turbo, but what's the B?

I haven't heard anything good about the MP series engines. I'm gonna stick to e7's for the next 20 or 30 years til they get their act together. Or I'll go Cummins.

Yea the original maxidynes made torque from 1200 to the gov at 2100. For the EM6 they dumbed the gov down to around 1750? but the powerband kicks in lower too, around 1050 or 1100. I think they did it for fuel economy and driver fatigue. Nothing like screaming along at 62 mph and 2100rpms for hours, but they'll do it all day long. My EM6-300L we bought in January says gov is at 1750? but not to exceed 2300 rpms. We haven't finished the truck body yet so it's just sitting, I have no hard experience with the EM6 yet. The old endt676 maxidynes were gov'd at 2100, but you could go towards 2300 according to the visor for you shifts, but I never liked that nor needed to. The EM6 uses the same block as the endt676.

My first 6 years driving were on a maxidyne 285hp with 5 gears, top speed of 62 mph. The tall jumps are what make the maxidyne excel. Mine had a Jake brake, which makes a huge difference for shifting. Up until these new automatic transmissions, I could outpull most trucks on the road. You are making 90%+ torque from 11-1200 rpms up. You don't need more gears, because you're always in you're powerband. The T310M maxitorque gears look like they match an 8LL pretty close, with the added benefit of having 6 (yes, six) reverse gears. You can shift through all 6 gears backing up. Mack transmissions have 3 countershafts which make them near bulletproof. Eaton's have 2. I haven't driven an em7, but I have a lot of seat time driving concrete trucks with maxidynes and maxitorques.