[gas0lean]

Greetings,I'm new to this board and have never posted an image so sorry if I post incorrectly.I have a Mariner 5hp air cooled outboard that runs beautifully. I'm not sure of the age/model etc.. as I don't have a manual for it. This is whats on the side.Mariner 5661 S 014071 However the main problem is I noticed a gasket at the back of the motor that seems to be seeping brown goo. Would you guys be able to tell me just what gasket I need and a few hints & tips on replacing it? Any help would be greatly appreciated. Thanks.gas0lean

[WillyBWright]

What a curious motor! Never saw one like that. It looks like it has a jug below the cylinder head. It looks like some black stuff at the base gasket. What's that appendage below the cylinder, an expansion chamber? I know it says Mariner but I wonder who made it.

[Keith Buchanan]

Looks like a Yammy/Mariner

[Winger Ed.]

'Goo' on the outside is OK for a 5 horse or even a V-6.However, Fresh gas and oil outside the engine could be a problem.I think you should just boogie on until it pukes.

[gas0lean]

Thanks for the replies, I've run out of time now and am flat out back at work so she'll just have to wait a few more months.gas0lean

[Paul Moir]

WillyBWright - that appendage is the exhaust manifold. You're not seeing the part where it attaches to an obvious spot on the cylinder. Whole picture, click here. Looks like a little exhaust leak there. Not much to worry about, but a couple new gaskets from your merc dealer are cheap and the fix should be easy if the bolts come free. The gasket should be 27-82942M for the exhaust housing side, and 27-80042M for the head side.Your engine is a Yamaha built 1974 model, by the way.