Old Machinist is right the perkins 4.154 engines are expensive to replace and the parts are expensive to fix one. Probably more 843s out there with the Izuzu engine.It might be worth 1-2K depending on the hours on it. Running 843 machines sell for 4-7K again depending on hours and condition. A rebuilt Perkins 4.154 engine will run you 6-7K plus labor to install.