67RModel

The intake ports on Macks with CMCAC are pointing straight up. the outlet of the CAC runs straight along the top of the engine and turns vertically down into the intake manifold. Even the E7s. And yes by 1978 - 1982 Mack had to have been developing a charge air cooler like we have today. In fact I think they were the first domestic company to offer one. On the E6 engine.

The XT signifies a particular ECM software programming. The engine is E7 Etec with a 460XT tune. 460 being the horsepower. There are many members on here who can elaborate on the specifics of the XT tune versus non XT tuning. 

And yea $60,000 for that truck is insanity on a whole new level. The bidders that kept bidding after $30k need their heads checked. 

On 9/26/2022 at 11:34 AM, Mack superdog said:

See we wouldn’t be having this conversation if Mack would have just made a big hp 6 cylinder like cat , Detroit, and Cummins

They did. They just never sold it to the public. The Mack Big Six. 885 cubic inch inline 6 and utilized E9 cylinder heads. There is one sitting on an engine stand at the Mack Museum.

I think mechanically you need different injector lines and an oil plug in the block. Maybe there is some other small things too. Electrically they are very different if you look at the wiring diagrams for both. All the gauges and warning lights/buzzers operate through the VMAC module and extra sensors I think. So while the engine will run since its mechanical only, your dash might be doing all types of funny stuff. I'm not 100% certain on this but this is how I understand it.

I agree with all of the above. The vast majority of CH613s were road tractors. This one was probably converted to dump service. It is interesting though that It has a double frame. Most road tractors do not, however, maybe this one was specd for heavy haul and the drop axle is left over from pulling a lowbed and someone threw a dump body on it much later in life. Does it have a red button on the dash for trailer air supply? If it does that is another indication it could have been a tractor originally. The air ride would be a complete deal breaker for me for steel body, off road, dirt work. The transmission is another deal breaker for me. A Fuller 9 speed does not offer enough low speed and creeper gears for off roading and getting started in soft ground. Since it has a Fuller the rears are most likely set up for Eaton ratios (0.71 OD). With that being said your options are 8LL, 9LL, or possibly an 18 speed Fuller if you wanted to change out the transmission. If you change it figure on having to shorten the driveshaft since 8LL, 9LL, and 18 are longer than a straight 9 speed.  Switching to a Mack tranny (2 stick) would most likely require you to switch out the rear end gears too. Crossmembers and mounting locations are probably not the same to easily switch to a Mack tranny either. You will probably miss not having a Jake since you are used to having one. Although fairly weak on these engines they do help on big hills and save your wheel brakes. Just my thoughts on the subject.

It could be that the pressure gauge is sprung and won't read past 20psi. You could purchase a cheap 0-150 psi gauge and connect it to one of the ports on the air tank just to verify you really aren't getting more than 20psi before you start getting real into the weeds. Does it have spring brakes? After idling for 5 minutes or so if you can try to release the spring brakes. You need about 60 - 65 psi to release them. 

On 12/3/2022 at 8:09 AM, other dog said:

This is JT's old truck. I didn't even know it until he asked me if I saw it there. I don't think I took but this one picture of it.

I wonder if the fellow JT sold it to still owns it? He is the one that finished the restoration and uploaded all the progress to JTs original thread. It’s over in the other makes section of the forum here. I don’t think he had been active for some years….

Saw this on Marketplace. Don’t know anything about it or E9s in general. Thought somebody here looking for E9 parts may be interested. In Youngstown OH. 

I think when I did mine I just disconnected that line from the compressor first and aimed it into a large catch pan and let it drain out that way until it stopped. Then disconnected the hose from the side of the block. It took a few minutes but this way I didn't have to drain out any more than I needed to. This was on a 94 RD. If I remember right the radiator drain / lower hose is still a good bit lower than where that hose runs into the block. Either way will work though.

Ok. That makes sense. Thanks for the info. 

If you scroll to the bottom of the article there are like almost 6,000 comments. A lot of them are pure gold. What a clown this Sam Brinton is. Biden put this deranged clown in charge of spent nuclear fuel for the whole country. 🤦‍♂️ 

A real wrist snapper if you ain't paying attention.

Quick question: Is a Dynatard the exact same mechanical principle as a Jacob's compression brake with Mack's name on it? I have heard from several guys that they aren't as "good" as a Jake? I never asked what they meant by this. Reliability? Cost? Braking Power? what are the differences if any? Thanks.

Aren't Miller 211s DVI? If so its nice to be able to run of 120 or 240 Volt power incase you have to pack it up and take somewhere there is only 120V outlets. I know it limits your amperage but its better than nothing I guess.

Another tip / hack I think most people know but if not is you can use aluminum foil to "mask" off large irregular objects or objects tape won't stick too like hoses, wires, or oil covered reservoirs. It works the best for hoses. Saves a ton of time too.

Also, the original Maxidyne trucks from say 1966-1972 have two as well. However, the lower one is open ended under the hood. I assume so the intake air stream is partially warm. These trucks didn't have charge air coolers so I don't know why they did that but they did......

Darn. I gave away a good FRO15210B a few months ago when I was cleaning out my garage. I had it in there for years and nobody wanted it. I think the guy just turned it in as a core. He had a deal with Weller I think that if he gave them two 9 or 10 speed cores they would sell him an overhauled 13 speed. ¯\_(ツ)_/¯

On 11/3/2022 at 3:05 PM, DM800guy said:

Good Afternoon,

Are these tires on 8.0”-8.5” rims. 
thank you

I did not see this until just now. I will check in a day or two and let you know.

18 hours ago, Paul Panson said:

How much?

$2000 for everything.

I don’t know if it’s like this all over Pennsylvania but in my area/district there is a program if you get a DUI or something like that the local magistrate(s) will order you to serve community service with PennDOT. From what I have heard and seen it amounts to riding around in the back of a crew cab pickup all day and sleeping. I see people all the time sleeping in the back seat of these PennDOT rigs around me. 

1 hour ago, Freightrain said:

I would look around for a 237.  Find a running engine for the cost of a rebuild and have more power to boot.

Granted, even a 237 is getting hard to find in decent shape.  I was REAL lucky when I walked into mine for $300!  Even if I did have to do a bit of work on it.

I put this up in Craig's other thread about if a 350 Cummins would fit under the hood of a B42. I have this R model with a super healthy 237, 6 speed lo hole trans and Mack rears if someone needs a powertrain. Truck is crusty but the powertrain components are great. And it has jakes on it. $2500 in Pittsburgh, PA.

12 hours ago, Craig N said:

What would you want for it?  It runs?

Yes runs and drives like a sewing machine. Has not been on the road in years but used as a yard tractor for a long time. Frame is crusty but the engine, trans, and rears are in great shape. Would be great for somebody that needs a good powertrain. $2500

On 10/29/2022 at 10:20 PM, Craig N said:

I would probably go with a Mack 237 or 285 before I did that though. Would like to bolt a twin box back up to it. 

I still have this 1972 R model for sale. It has a 237 with jake brakes and a twin stick 6 speed if you are interested. I don't need a lot of money for it. I'm also in the Pittsburgh PA area.

I found the Kijiji Canada listing for it: https://www.kijiji.ca/v-heavy-trucks/markham-york-region/1955-mack-for-sale/1636962965

It has a v12 Cummins engine, 8 speed transmission, and a 50:1 auxiliary transmission.