Hi, It sound like your belt was on too tight.
I was informed by a marine mechanic that for this pump, one should be careful not to tighten the belt too much, and that it is better to have it a bit loose. The reason is that the water pump on the 2QM15(and some other smaller yanmars) have small shaft bearings close together whereas others have larger bearings which are spaced a bit more. A small/close bearing design acts like one bearing and cannot handle the constant high torque caused by a tight belt like a pump with two spaced bearings can. I was told of water pumps failures just as you have described. Of course you don't want the belt to slip, but I keep mine belt on the loose side of the specs. You should be able to deflect the belt by a good 1/2" when tight. The manual states the defection should be between 0.4 to 0.6 inch defection. > > Graham: > > The pulley was on tight with no apparent misalignment. All seals, spacers, > and bearings were new and in the proper order. The bearings and shaft > reassembled into he pump housing without problem. Everything looked and felt > correct. That is why I am puzzled. > > Ed - Paul E. s/v Johanna Rose Carrabelle, FL _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
