Barrman
Well-known member
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- Location
- Giddings, Texas
I have to write this. When I saw your location all I could think of is driving south on I-75 and that climb once you cross the river. There is a similar grade and distance climb in Oklahoma. I was down to 12 mph on the interstate, wide open throttle, black smoke billowing and actually proud of my M35A2 for going that fast. Your hill is steeper and longer. All of us with military vehicles have learned the slow lane isn’t a bad thing.
Basic diesel 101. Air to the engine is not regulated. Engine speed is controlled by the injection pump and the amount of fuel it sends to the engine. So, pushing the pedal down more just adds more fuel. When that fuel is burned completely after mixing with the air nothing but clear heat comes out the exhaust. Too much fuel for the air inside the engine is when black smoke comes out the pipe. Which means black smoke visible in day light is wasted fuel. Besides wasting fuel it also causes the exhaust temperature to be higher. Enough of that and it can cause internal engine troubles. However, normally without a turbo your Exhaust Gas Temperature will never get high enough to melt a piston.
Be aware that all diesel exhaust in the mirror at night with a car behind you is visible.
Pep talk portion of the post. The 6.2 and 6.5 have developed a bit of a cult following over the years. There are those that hate them and those of us that think they are great. Fortunately those of us in the positive realm write about them online a lot. Whatever your issue, if you can describe it well and do some basic checks. The answer is out there. But, with a former military vehicle you have an extra bonus. The Technical Manuals. The government spent way too much money from a tax payer perspective publishing a huge set of instructions to do just about everything to the vehicle. There is even a troubleshooting section that if you follow the steps exactly starting with the very first word will almost always fix your problem. Once baselined the truck should give you very reliable and fun transportation that you can service yourself.
Basic diesel 101. Air to the engine is not regulated. Engine speed is controlled by the injection pump and the amount of fuel it sends to the engine. So, pushing the pedal down more just adds more fuel. When that fuel is burned completely after mixing with the air nothing but clear heat comes out the exhaust. Too much fuel for the air inside the engine is when black smoke comes out the pipe. Which means black smoke visible in day light is wasted fuel. Besides wasting fuel it also causes the exhaust temperature to be higher. Enough of that and it can cause internal engine troubles. However, normally without a turbo your Exhaust Gas Temperature will never get high enough to melt a piston.
Be aware that all diesel exhaust in the mirror at night with a car behind you is visible.
Pep talk portion of the post. The 6.2 and 6.5 have developed a bit of a cult following over the years. There are those that hate them and those of us that think they are great. Fortunately those of us in the positive realm write about them online a lot. Whatever your issue, if you can describe it well and do some basic checks. The answer is out there. But, with a former military vehicle you have an extra bonus. The Technical Manuals. The government spent way too much money from a tax payer perspective publishing a huge set of instructions to do just about everything to the vehicle. There is even a troubleshooting section that if you follow the steps exactly starting with the very first word will almost always fix your problem. Once baselined the truck should give you very reliable and fun transportation that you can service yourself.
