1974 Johnson 40 HP Outboard Motors Service manual, Page 45Get this manual
CONNECTING RODS The connecting rods provide linkage between the piston and crankshaftConnecting rod bearings Include roller bearing at the wrist pin, and split cage roller bearing at the crankshaftThe rankshaft Is of the two-throw type and is supported by three main bearingsA single row roller bearing Is used at the upper journa lA split cage roller bearing at the center journal is aligned to the cylinder block by dowel pinA roller bearing at the bottom journal absorbs the radial and vertl cal thrust loads of the ankshaftFUEL PUMP UPPER AND FILTER CYLI NDER CYLI NDER HEAD AND
3000 RPMMark the surface to be checked with the SUk The mark will appear dull and chalkyWhen the surface temperature reaches the temperature rating of the SUk, the mark will melt, becoming liquid and glossy in appearanceOn some painted surfaces on which the Slik will not leave mark, it will be necessary to hold the SUk against the surfaceSee Figure 5-3
A 163 Thermomelt SUk Is necessary to check the engineWith the engine at operating temperaturethe 163 mark should not melt