11.CRANKCASE/CRANKSHAFT Mongoose/KXR 90/50 CRANKCASE ASSEMBLY Dowel Pins Install the dowel pins and a new gasket to the crankcase mating surface. Assemble the crankcase halves. Special Crankshaft & crankcase install tool E024 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. Crankshaft & Crankcase Install Tool 11-11