mattb73lt

Just now, HarryS said:

They do that just to show who is boss. How is the ride without the body?

It sucks. The rear has no give and bounces pretty good over bigger bumps on the highway. Local roads are easier as the speeds are a lot less. I think the gearing is spot on. With the 4.62 rear, double over Triplex and 24.5 rubber it just floats at about 1650 RPM at 70 MPH. That's barely half throttle. If I come on a hill/grade, it's a quick downshift to 4th Hi-split and you're over it. I love the sound of the exhaust, but down the road I'm probably going to put a muffler on it.

The back drop dumps out the rear, versus a center dump. Additionally, it has an internal baffle that prevents the gasses from mixing until they leave the manifold, giving it a particular and distinct bark. A split manifold is actually two separate manifolds.

As for pin striping I do have a plan. Thick gold or maybe Cummins Old Gold for a main stripe and on the inside of that a thin Mack or Emerald green stripe. I'll probably put my name on the door, kinda like the other truck.

Test runs!!! Headed out about midday after the rain stopped. First one I went 25 miles, circling the house on local roads. I stopped often to check driveline temps, leaks and if anything was coming loose. Went back to the house to shut it down and check everything. Lost a little antifreeze though the cap, but it was topped up a little too high. Went out again, this time trying some highway(bravely). Was on another short circuit when I saw I had about 90 psi air pressure and slowly dropping. Was making a beeline for the house and got down to a little less that 70 psi and was crapping myself, then it started to build again. Went up to 120 and cut off normally. Got it back to the house and bled it down and the compressor cut in at 90 and cycled back to 120. Did that several times and it operates as usual. I think it was just trying to get me to leave skid marks in my drawers!! 
It runs great, though!! 60+ psi oil pressure running hot and 25 at a hot idle. Traffic was getting heavy, so I’ll go out another day for more miles.

So your saying it's leaning to the passenger side? A short nose B67 had the engine tilted to the passenger side by, I think, 14 degrees. This was done to provide clearance for the driver's feet, steering box, etc. If you have a standard cab the engine should be vertical. The frame should be pre-drilled or gas or diesel engine mounts and as you stated, they are different. I've done this swap to a B42 and have a 237 in mine. If the previous owner did the swap it could be possible they used a B67 engine. To tilt the engine Mack drilled the bolt pattern offset on the engine bell housing to get the tilt needed for that application. Pictures of what you have would be helpful to determine what's going on and to more clearly see your issue?

That is really coming out nicely!! It looks factory new. Everything is clean, crisp and sharp. It takes so much effort to make that happen. Beautiful job!!

Slowly going back together, again. Waiting on my power steering pump to come back from being overhauled.  Had to get it back from a local hydraulic shop after they  did nothing but complain about supply line issues for six months. Did a 20 minute internet search and found a place that would do it quickly. I should have it back maybe this week or early next week. I’ll leave the left fender off until it’s back in. Just makes it easier. Now that I can move the truck again, I was able to pull the bed up from beside the barn, today. Took the winch out of it and a few other items to get it ready to move to my friends’s shop so he can do some repairs to it. Strapped it to the deck of the B42 to move it when he’s ready.  I hauled the three hydraulic cylinders for the bed to Danbury last week to be overhauled, so they should be back in a few weeks. The pace to finish is finally picking up!!

For some reason the shorter video I have won't load. It's a walk around of it idling and just ticking away. So happy it just purrs. It was a lot of time lost, but now I can say I've touched every part of this truck.

Let’s try this one.

I'll try again later.

It’s ALIVE!!!! It fired off so gently and idles smoothly. Accelerates really well and has that Cummins bark! Now I can move it, since it hasn’t budged since October!! I have short video, but it’s too big. I’ll make another shorter one shortly.

The squawk list is a lot shorter, now. Lots of little stuff knocked out. The driveshaft came out nice. The UPS driver who frequents my house was busting my chops about it, saying the truck looks great except for the driveshaft! I got the throttle and clutch switches for the Jake mounted and adjusted. I’ll probably rough in the wiring for them and finish some more stuff under the dash.

Ran into some technical issues and had to send out some parts for recalibration. It’ll cost me another week and I’ll miss Brooklyn with the B73 and probably take the B42 instead. I’m using the extra time to finish a whole slew of open items, like getting the floor, pedals and carpet finished up. Later this week I’m planning on painting the driveshaft, among other things. Things will be a lot more finished when it’s running. The new interior looks awesome. I’m liking my new pedal arrangement.

On 6/10/2023 at 6:09 AM, 1961H67 said:

This is the “Old Cummins Yellow “ I got from Mahoney’s , you can’t tell much difference in what you used, Yours looks great . Can’t wait to hear it running! 

Yeah, it’s not too far off. This color is Cat Yellow. The fluorescent lighting changes the color a lot. When I shot it the first time I thought I was way off on the color. Once it was out in natural light it looked real close. People always ask, shouldn’t it be beige or gold?. Not in this vintage. I think they’re both close enough. I’m not trying to win some concours, I want to drive it and have fun.