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Pressure test the charge air system

They stopped using 100 PSI regs.. 80 is recommended... 100 can possibly blow out the E.U.P. o rings..

I was able to get a hold of a spec sheet that had parts going up to 80 PSI, nothing on a 100 PSI version. The 80 PSI option supersedes to 25501698, limited availability in Mack warehouses, but obtainable. No PAI cross that I could find.

Close Geoff, we call you all Seppo's A bit of Cockney slang that has been Australianized even further Seppo is short for septic tank, which is Cockney for Yank So to most Australians over the age of 40 would know that a Seppo is a American from the U.S of A Most people under 40 have grown up in very politically correct world Also Australia has lost a lot of its identity in the new globalised world that is apparently gunna be good for us all Paul

I checked to see if we had one, but it's been a really long time since our inventory saw one of these. None of our other stores showed any either, and our "best" electrical tech had nothing helpful to give either. This'll be outside of what I can help with unfortunately...

Wife drives a 2018 Ford Edge Titanium. I own a 2001 Ford F250 XL Super Duty with a 7.3 Power Stroke its currently parked due to some issues and high diesel prices lol. My daily is the 1976 Chevrolet Cheyenne C20

My chn 613 427 I’m losing power and blowing black smoke at lower rpm’s I know Mack’s don’t have conventional injectors but it’s acting like an injector loading up fault codes are signal codes to the cylinders I’m guessing that’s poor signal to the injector can somebody plse tell me where to start I haven’t had truck long and depend on it to feed my family

Hello, I’m interested to see if someone has a used ECM or information on testing a 12MS51M7 for a VMAC I engine. It’s acting like there is no power to the ECM for the emergency shutdown system. I was wondering if someone had a wire diagram for this ECM because Im not sure where the power supply comes from. It’s acting like there is no power supply to the emergency shut down which causes the truck to start for three seconds install like my previous post. it’s a 1995 RD 688S E7 VMAC I motor IMG_0108.heic

Nope, we're "septic's" in Aussi slang. I guess it depends on how polite they want to be.

Yep, same with Interstate McBee, have to go through a dealer. Kind of a pain, but I understand it. Once you find someone local you can use or a good internet supplier, it is almost like having an account. I had a good Internet one that turned bad, so I can't recommend them, Toward the end I was using Vandehaag's for S&S (Newstar) and Interstate McBee. I could call up with the part number and they would order without a deposit or having to go to them.

I know which valve you're talking about, but I can't find the part number for the 100 psi version. All the ones I can find are the 54 +/-7 PSI or lower. I'll see if I find anything, but hopefully someone else can chime in as well.

Agkits.com,, raineys truck parts.com,,, individuals cant Buy directly from PAI. The Mack dealer in my town started selling PAI just over a year ago.

I started an account on PAI website which is great for the parts catalogs, but I assumed I'd be able to order parts online too, but I don't see any function for it. Where/how do you guys buy PAI Mack parts?

If you have checked for a vacuum leak (unmetered air entering after the carb). take a good look at the distributor. Any play in the shaft can cause the dwell to go haywire when the advance starts to pull in. I'd 1st check the carb and intake for reason why it seams to be lean. But if you find nothing wrong look at the ign side of things. I had a 392 in a school bus that was in a shop for a valve job. Wouldn't run for crap and the shop wanted to put a new carb on, I wouldn't authorize it as I knew the carb was fine. They put one on to "show me" and it didn't run any better, had egg on their face and had to re-install the old carb and eat the price of the new one. Put a dwell meter on the ign and strapped to the windshield, and as soon as the advance started the dwell dropped to nothing. Long and short was the shaft bushing were shot and it needed a distributor. Also make sure the mechanical advance is free and the weights can move the shaft. Use a mighty vac to test the vacuum advance. It would act like fuel, stubble and back-fire with an occasional after-fire. I had to farm out the valve job because the place I was working, caring for their fleet, the bus took up the whole shop and was very difficult to get it in under its own power, would have been impossible to get it out and back in while the heads were being worked on. There is an old saying that 90% of carb problems are ign problems.

Same here. I drive a 2018 exploder, but it is still under warranty for another 40k miles or 4 years. The two other cars and 2 of the trucks are over 45 years old, and the other two are diesels.

Hello Does anyone remember the part number for E7 ETech 100 psi fuel return valve?Goes on side of block near 4-5 injector. I am in need of a new higher pressure valve.

https://www.ebay.com/itm/384440040267 buy this and you'll be ahead

Probably the sensors on the diff lock mechanisms.

And here I am at 36 and hate working on or attempting to work on vehicles that don't have a Carb or throttle body injection. 🤔 that's why I own a 1976 Chevrolet Cheyenne C20 I can work on it myself

I use carb cleaner or brake cleaner to check for vacuum leaks. Spray round carb base, carb gaskets, and intake and listen for change in idle. Also can't hurt to spray vacuum hoses either

I took the carburetor off and cleaned it as best I could, it will run but only with the choke mostly closed, the next thing I'm going to check is the vacuum in the distributor. It acts like it has a vacuum leak but I couldn't find any, and that's the only thing I haven't checked yet.

You got that right! Reminds me of the time I took a Dodge pickup I had to a little garage in Concord for something. The man said "I can't work on that, it's got a carburetor and I don't work on anything that old". It was a '91 model I think, which to me is not "that old". And it didn't have a carburetor, it had the throttle body injection. What he was REALLY saying was " if I can't just plug a computer into it and let it tell me what the issue is I can't work on it".

Gotcha, that's quite a ways from me! Glad you were able to find what you're looking for. Hope you stick around so we can see the end results too!

Hi All , would anyone have one or two of the very small bulldog mascots for sale? Paul