Just got a 3 cylinder 70HP Mercury which looks in fabulous condition, unsure of age serial no. 9197359. What is the fuel to oil ratio.
Our last engine (evinrude 50 '83') burnt a piston and scored a bore as the local water channels were blocked, this was the bottom of two pistons - the other was fine and the output of water was great, i.e. we didn't know it was happening.
To avoid this on the mercury how can I tell with a thermacouple whether the engine is overheating or not before this happens again, where does the thermacouple get placed. Is there any chemical flush that you can run through an outboards water system to remove the deposits without a strip.
Our last engine (evinrude 50 '83') burnt a piston and scored a bore as the local water channels were blocked, this was the bottom of two pistons - the other was fine and the output of water was great, i.e. we didn't know it was happening.
To avoid this on the mercury how can I tell with a thermacouple whether the engine is overheating or not before this happens again, where does the thermacouple get placed. Is there any chemical flush that you can run through an outboards water system to remove the deposits without a strip.