Outboard overheated

[CAPTAIN FANTASTIC]

My Mercury (Tohatsu) 3.5 four stroke which only one and a half years old, overheated and now it get a bit smokey at full throttle. For some reason it got very hot, perhaps it sucked something that stopped the cooling water momentarily (a minute or so).

I have changed the oil and I tried the engine today on the tender; starts ok, but on full throttle, it hesitates and then spits out a lot of smoke, then runs ok for a few minutes and then it get smokey again. I can take it to the dealers for repairs; at what price?; The engine has been serviced by the dealers regularly, so I am covered by the guarantee? The other option is to take the cylinder head off and check the valves stc. Have you had similar problems?

 

[VicS]

If its covered by the guarantee dont mess with it your self or it will be invalidated.

A compression test might be worth doing though. Probably the first thing a mechanic will do.

Probably it will need cylinder bore, piston and rings looking at rather than just valves.

 

[CAPTAIN FANTASTIC]

If its covered by the guarantee dont mess with it your self or it will be invalidated.

A compression test might be worth doing though. Probably the first thing a mechanic will do.

Probably it will need cylinder bore, piston and rings looking at rather than just valves.

I am afraid you are right; it is most likely that the rings got damaged.