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The billowing clouds of smoke are nature of the beast with the M123A1 - and I have been around several, so don't be too concerned about that. Regards, David

As Will said - the engine in a M123A1 is a V8-300 785 cid engine. It is similar to the V8-300M marine engine, which is a naturally aspirated version of the VT8-370-M. These predate the 903, and, obviously have a smaller displacement. This is a result of a smaller bore. As I recall, there are...

Just don't walk into the Cummins dealers and ask for 903 parts and expect them to fit the V8-300 in your truck - you'll be disappointed, as many people have been before you. Regards, David

Nope, that definately is not normal! Good luck! David

It'd be helpful too, if you have not been around a M123A1 running, make an effort to before you start tearing down the engine. The V-8 Cummins is much noiser than the Multifuel or a 6-cylinder Cummins - as a friend of mine says - they remind him of a threshing machine when running right! Hope...

Are you using the hand priming pump on the dashboard? - If no, it probably won't start. Are you using jumper cables, or a slave cable? If jumper cables - it probably won't start. Is the air filter hooked up? If so, ether won't help. Pulling the starter from one of these is a MAJOR...

AM General, My M123A1C won't start without using the hand pump in the cab - instructions for use on the dashboard. Also, the starter should really whirl the big Cummins around....loose connections will make it turn slow, and not fire. Hope this helps, David