2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Repair Manual, PN 5005471, Page 154Get this manual

2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Repair Manual, PN 5005471, Page 154

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POWERHEAD ASSEMBLYHP piston into bore with wood hammer handle or equivalentInstall thrust washer in blockSeat washer so bottom slot aligns with locating pin in block
Lubricate the thrust bearing