10. CRANKCASE/CRANKSHAFT CRANKCASE ASSEMBLY Dowel Pins Install the dowel pins and a new gasket to the crankcase mating surface. Assemble the crankcase halves. Crankcase Assembly Tool Crankcase Assembly Collar The distance between the right crankcase oil seal and crankcase surface is about 12.50.5 mm. When installing the oil seal, be careful to press it with even force. Crankcase Assembly Tool 10-7