Two years ago I repowered my 37-c with a Yanmar 3JH2e engine. All was well until I attempted to replace the raw water inpeller.. I had our stainless machine shop weld two pieces of stainless bar on the side of the jaws of a pair of vice grips, the pieces are 2 in. long and they make the job of impeller removal much easier. Hope this will help someone else also.. Tom