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Big Dog
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About Vmac3

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  1. It has to do with the volume of air entering the brake chamber. The smaller the diameter hose the less amount of air entering the brake chamber within a given amount of time. This will affect brake timing. Going down in hose I.D will dramatically change brake timing. V
  2. Yes you would be correct with a fully mechanical fuel system. I had seen a few glider kits with those engines. The exact date of when Vmac4 came out I don't recall, but I do remember it was in the 2005 Mack Pinnacle trucks with a MP7 with no exhaust aftertreatment. From 2005 to 2012 (with a red engine) Mack called their electronic system VMAC4. When US2013 emissions came out it was called VMAC4+ and to date it is called the same. The next emissions change has been implemented from 2021-2027 for the reduction of greenhouse gases. Here is the link for more information. https://www
  3. Welcome. If you have any questions feel free to ask. Great people here. V
  4. These are good trucks. Don't expect to outrun any big block Cats or Cummins equipped vehicles. These are excellent small blocks that will do the job. V
  5. 2002 was a good year. They introduced the CCRS engine at this time. The camshaft issues they had were not as common as before. The most typical configuration was the 400hp with a 8LL and 4.35 rears. It all depends what kind of maintenance this vehicle had. Valve adjustments are a real big deal for these engines. But overall a good truck. More reliable than what is being made today. V
  6. Oh and by the way, The CL is an excellent truck. V
  7. You would be correct my friend. It is hard to trace these air leaks down especially if you have constant ringing in your ears! I agree, try and separate the two systems and look at the most obvious, but it can be a bother tracing a leak that leaks down in a couple of hours or overnight. I have found leaks appear when the air ride on the suspension or the cab is extended but when the air ride is at ride height the leaks go away. I would check the tractor protect valve, I believe its located above the treadle valve. These sometimes leak as well. Also check the exhaust from the dash valve, I
  8. There are actuators that are controlled by air that are behind the dash that move the flaps in the vent box. These are always prone to leakage. If I remember correctly the air cylinder is white. The other air leaks can be coming from anywhere.,from air fittings, lines, valves and the air springs. Best thing to do is fix the obvious leaks that you can hear and use a sprayer with soap and water and look for the less obvious leaks. This can be a time consuming problem. I would fix the audible air leaks and not worry about those very small ones. V
  9. You would be correct. I believe it's 1850. Nevertheless I agree with what you are saying. The engine block and rotating assembly won't withstand the torque twist for long. V
  10. If you get a chance, check the valve adjustment on these engines. I have found that the cylinder that requires less shims in a particular cylinder than the others is a cause for concern. Especially #5. The valve seat is being pounded into the head, the valve itself is beginning to stretch or the valve face is folder over. V
  11. The injector trim codes is not life and death but very critical for precise adjustments. This will tell the engine ecu the operating characteristics of the injector. Each injector is manufactured to different tolerances. The engine ecu will use this trim code to calculate a more precise injection event. Also the engine ecu will be able to determine what is the injectors operating range. So when you are doing a injector contribution test, you are seeing how the engine ecu is making fueling changes. Now if you did not have the trim code installed in the engine ecu when replacing an injector, the
  12. Thank you DCW. Joey is a very kind person, helping out and sharing his valuable experiences. The easiest way to visually figure out if the truck has a Vmac1 or Vmac2 is, Vmac1 had a square electrical pass-through and Vmac2 had a round aluminum connector that had a nut that secured it self to the firewall plug. Vmac3 came out in 1998 and of course it had the EUPs. Vmac 4 came out in 2005ish, it was first introduced to the MP7. Vmac4 is the red Mack engine. Volvo first introduced this engine to Mack then later to itself. It was a US04 emissions vehicle. It had an EGR system but no e
  13. What are the oil clearances on #2 and #5 main bearings? You are looking for .003".
  14. I just learned something. I never thought of supplying a different battery to the ECU power fuse. Thanks Joey V
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