OMC Saildrive 15 hp
I am sure that my saildrive was a built on a Johnson 15hp power head. I had mine overhauled 3 years before I finally gave up on it and the shop assured me it was a Johnson 15. I guess it wasn''t that bad of an aux since it was first installed when the boat was built in 76, but when they start to go they go bad fast. If he has a OMC 15 hp sail drive and it is over heating I still contend that the motor is shot and it''s time to repower. There is NO impeller on such a motor the cooling water pump is seperate and sits directly forward of the power head. A heavy diesel would be bset for his needs but the 280 is about $4k less money and gives pleanty of kick for a 29 footer. He must have some water getting thru the cooling system or the motor would be cutting out alot sooner than he says it is.