1980 Johnson 4HP Service Manual, Page 11Get this manual
CLEARANCE CHART POWERHEAD
t Standard si ze Piston ring gap Piston ri nggroove Cylinder and piston 15650 0.015 0.0040 0.00301.5643 Min(39.7539.730.005 Min(0.380.130.0020 Min(0.1020.0510.0018 Min(0.0760.046
LOWER UNIT
Weedless Standard Weedless PinionBushin9in Gearcase Drive ShaftBushing in Gearcase Gearcase HeadBushing AssembIy Propell Shaft 0.0030.001 Min(0.080.03 0.00150.0005 Min(0.0380.013 0.00530.0020 Min(0.1350.051 0.00220.0007 Min(0.0560.018 0.00670.0022 Min(0.1700.056 0.00220.0007 Min(0.0560.018 sizeStandard 0.00180.0005 Min(0.0460.013
Gearcase Bushing to Propeller Shaft tTo correct slze for overslze piston, merely add ov ersize dimension to standard
TORQUE CHART
J&Failure to comply with recommended torque values cou ld result in operator injury
POWERHEAD
FI ywheel nut Connecting rod screws Cylinder head screws Crankcase to cyl nder screws center, lower Spark plugs Pull at propeller shaft to tilt lower unit Power pack mounting screws 30 60 60 60 40 66 80 80 Foot pounds Inch-pounds Inch-pounds Inch-pounds (40 (7.0 (7.0 (7.0