Onan BG Engine Service Repair Maintenance OVERHAUL Shop Manual & Parts 965-0251

This is the Service Manual for the ONAN BG MODEL ENGINES. This manual contains proper information for the servicing and overhaul of your Onan engine. It is useful for both professional mechanics and DIY enthusiasts. The parts catalog in the rear portion of this book can assist with disassembly and assembly procedures. It is recommended to keep this manual handy for ready reference, either for ordering parts or making adjustments.

The manual deals with specific mechanical and electrical information needed by engine mechanics for troubleshooting, servicing, repairing, or overhauling the engine. The table of contents provides a quick reference to the separate engine system sections. The separate Parts Catalogs available at the dealer level can be used for parts identification and for establishing their proper location on assemblies.

The TROUBLESHOOTlNG GUlDE in this manual provides a quick reference for locating and correcting engine trouble. The illustrations and procedures presented in each section apply to the engines listed on the cover. It is important to note that the flywheel end of the engine is the front end, so right and left sides are determined by viewing the engine from the front.

The disassembly section contains major overhaul procedures for step by step removal, disassembly, inspection, repair, and assembly of the engine components. Additionally, the wiring diagram shows how the electrical components are interconnected.