12. CRANKCASE/CRANKSHAFT ATV 50 CRANKCASE ASSEMBLY Dowel Pins Install the dowel pins and a new gasket to the crankcase mating surface. Assemble the crankcase halves. Special tool: Crankcase assembly tool (Right crankcase) A120E00016 Crankcase Assembly Tool The distance between the right crankcase oil seal and crankcase surface is about 12.50.5 mm (0.50.02 in). When installing the oil seal, be careful to press it with even force. 12-7