This manual provides comprehensive coverage of the operation, maintenance, and service procedures for two-cylinder, 60 cu. in. 21.6 horsepower ONAN JB engine and the four-cylinder 120 cu. in. 42.5 horsepower ONAN JC engine. It is an essential resource for engine mechanics, offering specific mechanical and electrical information required for troubleshooting, servicing, repairing, or overhauling the engine.
Utilize the table of contents for quick reference to the separate engine system sections. Additionally, separate Parts Catalogs are available at the dealer level for parts identification and establishing their proper location on assemblies.
The TROUBLESHOOTlNG GUlDE included in this manual serves as a quick reference for locating and correcting engine trouble. The illustrations and procedures presented in each section are applicable to the engines listed on the cover. It's important to note that the front end of the engine is the flywheel end, thus determining the right and left sides by viewing the engine from the front.
The disassembly section contains major overhaul procedures, providing step-by-step guidance for removal, disassembly, inspection, repair, and assembly of the engine components. Furthermore, the wiring diagram illustrates how the electrical components are interconnected.
