1972 Johnson 4HP Outboard Motor Service Manual, Page 8Get this manual
CLEARANCE CHART POWER HEAD Piston ring gap Piston ringgroove Cylinder and piston CrankshaftUpperCenterLower Connecting rodPiston endCrankshaft end LOWER UNIT Weedless Standard PinionBushing In Gear .003 0015 Shaft Bushing PropeHer Shaft .0063.001 Min- .0005 Min- .0020 .0020 .0055 .0020.0005 Min.003 Min.0018 Standard.0005 Min.015 .0040 0020.005 Min- .0020
- .0008 Min
Needle Bearings .0023.0013 Min.0023.0013 Min.0011 .0017
- .0004 Min- .0007 Min
Weedless Drive ShaftBushing In Gear Gear Housing Propeller Gear
- .0005 Min
TORQUE CHART
POWER HEAD Flywheel nut Connecting rod screws Cylinder head screws Crankcase to cylinder screws upper, center, lower Spark plugs at propeHer shaft to tilt lower unit 3040 Foot-pounds 6066 Inch-pounds 6080 Inch-pounds 6080 Inch-pounds 17-1220-12 Foot-pounds 1215 lbs