After research, I’m gathering that Nissan didn’t make a 48hp diesel, it sounds like they made a 48hp gas, and nissan diesel engines generate 60 to 70 hp engines, I’m thinking maybe the original valve cover was lost or misplaced, so someone put a gas Nissan engine valve cover on it. Can this be a possibilty??? I’d like to know what engine it is, so I can get it running, with new or rebuilt injector or possibly get injector pump replaced or rebuilt..