Mariner 2hp o/b - water in cylinder - how?

[TQA]

Take a flat file and clean up the surfaces of the cylinder and head. Don't take too much off but enough to clean down to metal.

NOOOOOOOO

Please Please do not use a file.

Wet and dry 120 grade [ or emory cloth ]with parrafin as a lubricant.

If you suspect that the surfaces are no longer flat then use a surface table or sheet of plate glass and a sheet of W/D with parrafin again as a lubricant and move the suspect surface back and forward. You will soon see if there are low spots.

Draw filing mating surfaces flat is a lost craft.

 

[macd]

Agree totally with TQA. A file shouldn't be let anywhere near a mating surface (especially in the hands of someone who by his own admission is not over-familiar with engine work).
As alternative to paraffin, meths or even WD40 also helps. A sharp knife used with care as a scraper in a dragging motion (or better still a bearing scraper) is good for the stubborn bits, but scoring of the surface should be avoided.

 

[theoldsalt]

TQA & macd,

Nice to know you agree with me !!

 

[oldharry]

Might be an idea to check for brown rusty water in the fuel tank which has worked it way through although it probably wouldn't have started in the first place.
It's just about the only place rusty water could come from, any other water would be sooty / oily.

... except these have plastic fuel tanks. However, I would suspect contaminated fuel. Seawater getting in to the engine wouldn't be rusty - it doesnt stand around long enough, and the castings are alloy anyway.

Try dropping the bowl off the carb, and see if there is any there too. If you carry a spare fuel can, check whether that has water in the bottom of it.

Its the rustiness that puzzles me with a mainly alloy engine - and yes I know the bore is steel lined, but...

 

[Oldgeezer]

Now its all cleaned up and reassembled I suspect the rust was caused by water around the drive shaft and inside the stainless steel tube. This would have been caused by the oil seal leaking above the water pump (or possibly 'o' ring failure) and the water feed tube from the pump being blocked. This would also explain the trickle of rusty water from the small pee hole at the front of the engine. This little hole feeds from the top of the driveshaft.

Anyway, I've replaced the lot and its all working happily now !