1978 Johnson 4HP outboards Service Repair Manual P/N JM-7803, Page 67Get this manual
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SECTION LOWER UNIT
TROUBLE ISOLATION CHART 6-2 DESCRIPTION 6-3 REMOVAL OF GEARCASE AND EXHAUST HOUSING 6-3 REMOVAL OF GEARCASE 6-4 WATER PUMP SERVICE 6-4 DISASSEMBL OF GEARCASE 6-7 CLEANI