Mack Technician

If your roller looks like this get ready for a party.....just saying, not jinxing.

You can ohm it to a know-good EUP. You can continuity the lines back to the ECM (or firewall) if your up to a light amount of digging. I'd get a PAI (especially if you have no miss, still running, and can order "aftermarket") to replace only the bad unit. Pretty easy day on a truck like yours! Pull the block fitting and drain the block before you pull it, or dump into sump and just change oil. Roll engine to get the EUP cam lobe down to make install easier, pull bolts up equally when loading back into block. Always replace both retaining screws. Record EUP calibration code (on front plate) so you can have code uploaded next time your in the shop. Gently remove EUP roller and inspect. Scissor spread your fingers (or insert a hook pick into roller slot) and gently lower back onto cam lobe without dropping. Check guide indexing pin in wall of EUP bore.

Sure enough, but the "A" class? If you go the U.P. during deer season you will see a few like this crawling out of the swamp onto the highway.

Already in the works on that. "Cash for Smokers" Engine buy-back program started by Trump. Program goal is to tap South Am, Central Am + Africa for the Mack engines we chased out.

Off the Phase 2 shortcut.... "However, to hit those marks, the agencies are asking for better performance from North American truck and engine makers and testing the imaginations of their engineers." I received insight into how the engineers feel when they reasonably perfect a current emissions tier and the EPA tells them "Hey, guys! Let's TEST YOUR IMAGINATION". No cheers and party whistles in the office.

I have the Mac III diagram... Three terminals on your dash fuel gauge, I & S & G. The gauge "I" terminal receives 12 volts from fuse 19 and sends power out of the "S" terminal to sender unit in tank. Power goes to tank, through the variable resistor in tank sender and to ground wire/chassis.

I'd check to see if Mack PDC still has an engine harness in the corner of some warehouse.

Certain to pull a bass boat and not lose on hills.

Nice unit. Nostalgia... My first job we one in a 366 tractor for a yard trailer jockey.

Manometer

Ghost in the J1708 serial link apparently. You want me to go through and scan my repair manual or have you already found a copy on-line?

Run a spare ground wire and check signal voltage. Check chassis record and make sure you have the right one that is not hitting the wall and be certain you have not clocked it degrees off during installation.

Once you have leaks fixed and turbo inspected build a manometer and measure the blow from the crankcase. If you have 6-8" of blow your heading to the shop. Also check your air intake system for the dust leak that took out your piston rings.

Hope the prophecy comes true, however, coming up by you Feb 14th and we need a nice, fat, sheet of ice on Leech .

Your invited up here in January, fuel crystallization is not nearly as fun to describe as to experience........along with a split, frozen, windshield wash jug....tranny lube so thick it snubs the engine when you let the clutch out (in neutral)........Shrinking, leaking, seals in range shifter......Synchro clash cause oil won't squeeze out of plates....Salt chewing holes into everything you drive..... rotten, seized, sticking, throttle pedal assemblies because you get out onto over-salted walk ways and then hop back in with salty feet which also rots out your floor boards because it stays hot and wet and activated on floor.... laying out with salamander heaters shoved into every compartment and getting so nasty cold that your shoe bottoms clap like tap dancing shoes when you walk into the shop only to find they split on the bottom cause the rubber got too cold and now you have wasted $160..... I'm not bitter, but it gets ridiculous and only the ducks knew enough to get out in time.

J1939 is a general term for a "CAN"- Controller Area Network. It's full name is SAE J1939 (society of engineers). AKA- Lots of computer inputs going down one shared line. Can think of it as "common access network". It is dedicated to communications and diagnostics. Usually a three twisted-wire (yellow+green + black) harness that you can identify by it's triangular connection. Yours is having a communication issue. What is the blink code number?

Snopes.......... BMW, Chrysler, Nissan, Toyota and VW have said their warranties will not cover fuel-related claims caused by E15. Ford, Honda, Kia, Mercedes-Benz and Volvo have said E15 use will void warranties, says Darbelnet, citing potential corrosive damage to fuel lines, gaskets and other engine components. The AAA says the sale and use of E15 should be stopped until there is more extensive testing, better pump labels to safeguard consumers and more consumer education about potential hazards. Good reason to avoid single line gas station pumps............. Some critics have maintained that because most gas stations don’t want to go to the expense of putting in new tanks just for E15 and will instead likely install blender pumps (which mix the ethanol and gasoline together in the right proportion for the selected fuel type), the possibility exists that an E10 customer who uses a pump directly after an E15 customer might receive as much as a third of a gallon of E15 from residual fuel remaining in the fueling hose, to adverse effect. It is unlikely that such a relatively small amount of residual E15 mixed into a gas tank of E10 could cause problems for standard automobiles, but it may potentially be an issue for gasoline-powered vehicles and equipment with smaller fuel tanks, such as motorcycles, ATVs, chain saws, and lawn mowers. The EPA initially considered heading off this potential issue by imposing a requirement that E10 customers purchase a minimum of four gallons of gas at stations using blender pumps that dispense E10 and E15 through the same hose, but that proposal has since been dropped in favor of requiring labeling on blender pumps stating that such pumps are solely for passenger cars and trucks. At the end of 2013, the EPA announced it was reducing the amount of ethanol that must be blended into gasoline in 2014 (in part because the overall demand for gasoline in the U.S. has dropped), requiring transportation fuel companies to blend 15.21 billion gallons of ethanol into the nation’s fuel supply in 2014, down from 16.55 billion gallons in 2013. Critics of the EPA’s blending requirements pointed out that the announcement came just four days after the Associated Press published a lengthy investigative article documenting substantial environmental harms caused by ethanol which concluded that “The ethanol era has proven far more damaging to the environment than politicians promised and much worse than government admits today”:

https://otrperformance.com/product/mack-aset-ac-egr-performance/?gclid=COyxzuS2kdQCFVGAaQodRUsCgg

Speaking broadly on OEM's (not just Mack), VGT calibration is a fine way to identify a bad variable turbo. If you are not stroking properly it may show itself by an inability to calibrate. Sounds like your getting AI427 performance out of a AC427, not right. They generally respond faster than AI or pre-emissions.

Our worst cold issue was with fuel slobber gluing the exhaust valves solid, especially PLN. Additives didn't matter. Customer would crank it up on a cold day, drive across town and shut down. Fine on a fall day. At sub zeros the unburned fuel slobber would cool into epoxy on the exhaust valve stems and bend the pushtubes at next start-up. At first Mack would warrranty it and then said "no, you will advise (require) your customers to reach suitable operating temps at every start-up". Really only a couple repeat offenders that would do that, most guys are rolling for the day. If we brought the truck into the shop for a clutch adjustment, during the snap, and it had to sit outside afterwards, mandatory, we had to drive it eight miles on a burn off.

FJH, you seldom walk away from an inquiry without asking "WHAT are you talking about". No matter how painfully random it is. Can the host build a pre-req questionnaire? Something for issue inquiries? An AI service writer with the four "W's" or flow chart? This sight is fairly well tweaked, you'd think it was possible. year make Model miles/hours Symptom Frequency active code present component repair history etc etc They could have a specific flow for each group heading.

We have a mobile V8 CAT gen, behind a Pete, that can power the factory and one more smaller unit at our Dam. I stabilize that fuel since it turns over so slow. Speaking in favor of additives...... the engine runs great on 10 year old fuel that may have turned back into dinosaur meat without stabilizers. Big Gen has its own building. What does your group put as a shelf life on fuel? Tank full all the time, stabilized with Sea Foam stabilizer, steel 400 gallon, inside storage, no elements beyond ambient swings in unheated building?

(2000CL) Seems like your immersed in sharpening the edge of this truck.....is it a dandy or just generally needy?