Reply To: 1960 Evinrude 5.5 Fisherman Powerhead

[William MacNeill]

There is no indication of the powerhead ever being split. The head gasket was part of the cause of the compression loss. It was in rough shape and was blown through in spots. Compression improved when replaced on the top cylinder but the bottom was still low. The walls of the cylinders look smooth and with no imperfections and the pistons being the same. The lower rings were stuck prior to me splitting the case open with carbon build up on the lower cylinder. I did get them free with PB Blaster and Seafoam. I still believe this engine overheated. As I stated the waterpump was aftermarket and much smaller than the OEM. I’m sure it worked when new but the impeller was in need of replacement when I checked it. The thermostat was broken and with no rubber ring on top. The water passages were also caked restricting water flow so I’m sure no water was circulating whenever it was last run. Not that this makes a difference there was a cotter pin in place of the drive shaft pin and there was only one brass nut on the shift rod. The carb was gummed up completely. This motor was not taken care of. I bought this motor for 50.00 as it’s appearance was clean and not knowing the  mechanical condition I thought I could get it running by rebuilding the carb and water pump. I should of done a compression test before buying it but again went by appearance. I do not have a lot into this motor. I could part it out but I decided I am going to get it to run as appearance wise it’s a strong 7 out of 10 and it came with a nice gas tank.  I am going to hone both cylinder walls and throw rings into it and hope for the best. If that does not do it then I will put it aside until a better powerhead with compression can be found. I now know why it was $50.00. I am hoping to find the rings locally or here in the US instead of going overseas to purchase.