2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 131Get this manual
FUEL SYSTEM INTAKE MANIFOLD68
INTAKE MANIFOLD68
Removal
Follow steps listed in CARBURETOR Removal, this section
Remove the screws securing intake manifold to crankcaseRemove two screws securing leaf plate to crankcase
Inspection
Do not lift or bend leaf valves by handThis may damage them so they may not seal properly or may break after the engine is returned to serviceInspect the leaf plate assemblies for damage: The leaf valves and plate must not be distorted The leaf valve tips must not be cracked or chipped The leaf stops must not be distorted or loose Use machinist's straightedge to check the flatness of the leaf plateThe gasket surfaces must be flat, 0.003 in(0.08 mm)Inspect the check valve
Disassembly
Do not disassemble leaf plate assemblies unless leaf plate seats, leaf valves, or leaf stops are damaged or corrodedRemove the screws and leaf valveWhen disassembled, keep the stops and leaf valves separated by assembly