My 60 HP Evinrude 1990 has run meanwhile 500 hours and I wanted to control, if the bearings of the crankshaft (big end bearing of rod and upper bearing near flywheel) are still ok. I opend the the cranking-house from carburator side and reed-box. I can see, that the cranking turns about <br /><br />8 Millimeter <br /><br />measured at the border of the flywheel, without moving the pistons. (Position of pistons, on half the way) That's possible by bearing-clearance in the rod-bearing.<br /><br />May be, this is ok or it's a hint for to much abrasion. Of course I don't see any corrosion and of course I don't see any metal parts inside the cranking house. Overall it looks pretty clean. <br /><br />Perhaps I am to carefull. But I hate a breaking motor, when sea goes high and wind blows into the direction of a cliffy coast-line. <br /> <br />Who knows the allowed tolerances. Perhaps, is this bearing clearance allowed and necessary?<br /> <br />Your answer can help me to avoid disasemble the power-head. My dealer cannot give a better answer but to buy a new four-stroke motor. Up to now my machine worked well. Only the VRO-pump-electronic made some sophisticated trouble. But meanwhile it's ok by good advice in this board.<br /><br />My idea to control the bearings comes from the impression that the flywheel is to warm, if the motor has gone a longer distance. Unfortunately it's not possible to see the upper main-bearings. <br /><br />Thanks for your answer.<br /><br />Gruß Helmut Rüberg
