1978 Johnson 55 HP Outboards Service Manual, Page 11Get this manual
IGNITION COIL OHMMETER TEST Primary Low Ohms 0.1" 0.05 Secondary High Ohms 275 25
CLEARANCE CHART
Power head Piston and wrist pin0.0016" max- 0.0010" min(0.041mm0.025 mm) Piston ring gap 0.017" max- 0.007" min(0.43 mm0.18 mm) Piston ring groove clearance, lower ring only 0.0040" max- 0.0015" min(0.102 mm0.038 mm) Cylinder and piston 0.0065" max- 0.0045 min(0.165 mm0.114 mm) Crankshaft bearings Upper Roller type Center Roller type Lower Ball type Crankshaft end play0.0165" max- 0.0006" min(0.419 mm0.015 mm) Connecting rod bearings Piston end Needle bearing Crankshaft end Roller type Lower unit Gearcase head and propeller shaft Roller type Driveshaft to gearcaseupper Roller type Pinion to gearcase Roller type Propeller shaft to oil pump Roller type Front gear bushing to propeller shaft 0.002" max- 0.001" min(0.050.03 mm) Propeller on shaft Spline
TORQUE CHART