Yamaha Model FT9.9ELD (1990)
I am attempting to replace the water pump impeller and oil seals under the pump. This motor has not been serviced for a long time and the water pump assembly bolts were very seized from salt build up. I was able to work 2 of them out by a series on small movements, however I was not so lucky on the back 2 bolts. Both bolts broke at the point were the threads start. My question is should I try to drill them and use an extractor or should I just drill them slightly over-sized, re tap and use the corresponding oversize bolts. (in this case I may have to drill the holes in the housing slightly larger to accommodate slightly larger bolts. It looks like there is enough meat to go down this road. My concern with using the extractor method is that if the extractor breaks off in the end of the broken bold then it is impossible to drill. Any imput would be appreciated.
I am attempting to replace the water pump impeller and oil seals under the pump. This motor has not been serviced for a long time and the water pump assembly bolts were very seized from salt build up. I was able to work 2 of them out by a series on small movements, however I was not so lucky on the back 2 bolts. Both bolts broke at the point were the threads start. My question is should I try to drill them and use an extractor or should I just drill them slightly over-sized, re tap and use the corresponding oversize bolts. (in this case I may have to drill the holes in the housing slightly larger to accommodate slightly larger bolts. It looks like there is enough meat to go down this road. My concern with using the extractor method is that if the extractor breaks off in the end of the broken bold then it is impossible to drill. Any imput would be appreciated.