How is my Sea King cooled?

[thomasj151]

I have an old Sea King outboard, dark red, I'm guessing under 10 hp., approx. 30-40 yrs.old. Model # 74GG9012 I don't see any impeller in bottom unit, nor do I see cooling fins on the head. If it is water cooled, I may have put gear oil in the wrong places and clogged any water passages. How can I tell how it is cooled? If water cooled, how does water get up to engine?

 

[alcan]

Re: How is my Sea King cooled?

Hi Thomas<br />You have a 1947-48 5hp SeaKing. These motors were made by OMC's gale div. for sale by Montgomery Ward. This is a twin cylinder water cooled 2 stroke motor. It has a wobbler style water pump empeller. This empeller is driven off the prop shaft. If you remove the prop you should see a cover with some slits in it. this is the pump. This is the same style pump that is used on the Johnson TD20. The problem is, it is a different size. A fuel/oil mix of 24:1 and the point gap is .020.

 

[tmcalavy]

Re: How is my Sea King cooled?

That's a 47 Sea King (74 backwards) and it is water cooled. The wobbler impeller and pump is behind the prop, under a housing. Go here: www.pfs-ware.com and then to the Oliver outboard page. There's link there for impellers. You can check the water passages by running water up the inlet, sometimes a wire and compressed are useful to dislodge mud dauber nests. If its cooling correctly you should see some water out of the exhaust ports on the leg, and the head/water jackets will be warm, not hot, to the touch. If it gets hot enough to sizzle, shut it down quickly and fix the pump or it'll fry and seize.

 

[tmcalavy]

Re: How is my Sea King cooled?

Forgot to add: fuel mix is 16:1, uses a Champion J7J plug, points gapped at .020 and plug gapped at .025. A J7J plug is same as J8C in modern equivalents.