This has been talked about before.
Yet after the subject is talked about the ones who start the Threads never get back to use on what the actually did.
The Governor inside of the Fuel Injection Pump is not setup for the type of control that a Generator needs.
The Older Thermoking Gen sets used to use Mercedes Engines (OM636 I believe). If you found one it would already have a Generator and the type of Fuel Injection Pump and Governonr needed.

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84 300D, 82 Volvo 244Gl Diesel