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Mackpro

Pedigreed Bulldog
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Mackpro last won the day on January 21 2023

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  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
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