All valve maintenance activities start with component examination and cleaning which includes inspection of
Crankshaft and crankshaft bearings alongside
Camshaft and crankshaft bearings and cylinder head and valve train elements along with valves, seats and springs. Service procedures also cover
Piston components and crankshaft bearings and cylinder block and bore examination. The subassembly service work strives to repair cylinder head units and piston assemblies as well as connecting rod assemblies with their piston pin components. Among the tasks included in engine service and repair are engine disassembly followed by engine assembly. A component without an independent service procedure in the manufacturer documentation means they did not publish one which can be found in engine service and repair documents.