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Mackpro

Pedigreed Bulldog
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Everything posted by Mackpro

  1. On trucks where the air compressor gets it’s fresh air from the piping between the air filter housing and the turbo, we see guys running dirty air filters and the engine is sucking for fresh air so hard it pulls oil up past the rings on the air compressor which pumps it into the air drier/air tanks. Very common on the 2003.5 -2007 Aset Ac engines . Could also happen to any truck with air compressor getting its fresh air this way.
  2. Yes , if the dash cluster software update was done It should buzz when the diff lock is engaged.
  3. Here the bulletin, click on view file . https://macktrucks.vg-emedia.com/ProductDetail.aspx?ProductId=11698
  4. If an MP8 then you can easily pull the elbow and hose off the EGR cooler outlet ( towards the front of the truck) and look directly into the EGR cooler and look fir dried and crusty antifreeze. MP7’s are harder to do because you can’t get the EGR cooler outlet pipe out of the way with out pulling the fan clutch to look inside the EGR cooler. There is a radiator pressure cap on the left side ( not the right side) of the coolant expansion tank on top off the radiator . It has a small overflow drain hose on it . If the cap is blue it needs the new black cap on it . If it has the black cap , get a 1 liter clean Sprite bottle and put the end of the hose in the bottle ans zip tie it up and run the truck for a day . See if it’s actually blowing the coolant out or burning it,
  5. MP7 or MP8? And are you sure it’s a GU and not a CTP?
  6. The local Kenan gas tanker trucks had those transmissions in them many many years ago. I went on many late night service calls due to the drivers leaning over on the gear shifter and the shifter would pop out of the slot for the shifter fork. We finally found out if we left the gasket out and just used RVT/silicone the shifter would stick down in the top cover just far enough to keep this from reoccurring.
  7. All of our trucks have had the FXL axle with sealed hubs . Our new 2024’s have went back to the old Eaton looking axle with oil bath hubs. I’m not thrilled.
  8. You have to leave the .045 feeler gauge in place when you adjust the .024 exhaust
  9. Here is a helpful picture of which adjustment screw dose what on the powerleash.
  10. Make sure the little valve cap is on top of the exhaust valve , Item 3 in this picture powerleash.pdf
  11. The banjo fitting on the filter housing on the line from ECM cooler plate to the fuel filter housing is prone to clogging .
  12. Lots of items have been dropped from the extended warranty plans. We max out the extended warranty on the trucks here and things that used to be covered in our 2016 extended warranty plans are no longer covered in our 2021 plans. Sometimes the salesmen dont not go over the fine print on the extend warranty.
  13. Mack SB-213-027 is the bulletin. This only applies if you have the Jacobs/J-tech engine brake. ETECH style J-tech brake pin.pdf
  14. If you have the Jacob’s engine brake . The floating pin in the exhaust yoke is worn. I’ll see if I can find pics. This was a big issue and new hardened adjustment pins came out with a special coating on them .
  15. 2004 was the first year and only year for they crammed Aset AC engine in the CH/CX the results were not good . Lots of over heating issues, we were changing fan belts every oil change due to the under hood heat causing belt failure. Things eventually got sorted out with parts updates and service campaigns/recalls. By 2005 the CHN/CXN came out and problems decreased. I do remember seeing the fan clutch surging you described but don’t remember the cause or repair. The fan clutch used on the ASET AC look exactly the same but are different part numbers, so the incorrect one could be installed. Troubleshoot on the fan clutch https://pdf4pro.com/cdn/service-bulletin-mckenzie-tank-lines-a3dd0.pdf
  16. There was an older service bulletin on the 4094 that was very helpful but I don’t have it with me. Something often over looked is the EGR system, mainly the EGR differential pressure sensor and it’s common problem of port clogging. There are updates for the MP7 venture pipe, tubes and sensor. When the ports clog the Engine ecm sees low EGR flow and commands the EGR valve to open more and can cause the 4094 code. DEF usage and dosing percentage varies based on engine load and other factors so don’t look to much into that. Also on pre-OBD ( 9 pin diag connector) I was told by Mack Tech Support that the nox readings that you see might not be always what the actual readings are and what the ACM actually sees. Also the exhaust stack outlet should be clean with no soot or darkness. Any soot passing the DPF will cause high NOx . The pre-OBD 4094 and the 2013+OBD P20EE00 codes are pretty much the same. Which is their way of saying “ You got high NOX and we don’t know why and you figure it out”. Usually on OBD trucks the the outlet nox will be 1/3 of the inlet when dosing. Message me your email and I’ll see what bulletins I can find to send you.
  17. 4554 psi is the pop pressure for your injectors. You can go to the Mack E-media website and click on Pre-2000 info and the choose 1999 in the year. Hit search and find the tune up manual 5-309. Then choose it and then click view file and it’s free. If any of the manuals in E-media have a “View File” by the manual part numbers they are free to download.
  18. Looking through my notes I had a 2010 CXU that would randomly go to idle and no throttle pedal. It was a shorted out battery. Unhook the batteries from each other and check with a volt meter. A cheap battery load tester from Harbor Freight is handy for this . Make sure you mark your wires and get them back in the correct location.
  19. I saw where the Dodge Ram trucks were going to do basically the same a use the V6 Penstar Jeep Engine that will be only hooked to a generator to charge the battery pack.
  20. In the PI,AN and GR’s (Pinnacle , Athem and new stlye Granite ) they now have the light control module LCM that controls all the lights. In the fuse box on top of the dash , check all fuses labeled LCM There could be as many as 7. These trucks now have 2 separate hood harnesses one for the right side and one fir the left. I have see a few passengers side Athem harnesses rubbing and shorting just behind the connector at the hood on the chassis side of the connector.
  21. Are there any fault codes active when your limited to 1400 rpm? Is the PTO light on in the dash? 1400 rpm is the default max engine speed for some faults like camshaft or flywheel speed sensors.
  22. What year model is the truck/engine? Early ETECHs we’re popping at 4300 to 4500 depending on part number of injector. The CCRS engines starting in mid 2001 were at 3000 or 3100 psi and the Aset starting in mid 2003 were 3400-3700 .
  23. I made a jumper harness just for this reason.
  24. https://pdf4pro.com/cdn/service-bulletin-mckenzie-tank-lines-a3dd0.pdf This is the bulletin on your fan clutch. In the bulletin it tell you to ground one wire and supply 12volt power to another. This should disengage the fan after a few minutes of running . If not then the fan clutch is bad.
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