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The old 2-71 generator sets are really nice. The 71 series engines at 1200 rpm are actually not particularly loud. As an operator I just prefer the John Deere engines because the parts availability is better and I don't have to work through that crazy Detroit Diesel parts manual. I'm down to one...

I bought a used 6.5 Optimizer with unknown miles. The truck was a 2001 and supposedly had 135k miles. The bearing inserts in the engine were 2004 so I'm certain the engine was replaced. It had some valve recession and the fire ring in the head gasket wore into the block. I had to strip the...

The current emissions spec John Deere units are quite the little hot rods. We spin generators with them but they're cranking 150 horsepower at 1800 rpm. The older engines use a Stanadyne DB4 pump. It shouldn't be much trouble to turn one up to 200 horsepower.

If you want a 4-cyl diesel that doesn't buzz, the John Deere 4045 engines have a counterbalance shaft and are smooth.

The 6.5 may be a better direct swap for a gas engine because it makes power like a gas engine. The Duramax and Cummins engines both run at lower speeds than the 6.5. Running the other diesels may require gear ratio changes to get the most out of the engine.