My stbd engine (SP135) has been producing a small amount of steam out the exhaust - nothing from the port. No other symptoms. It wasn`t a huge amount but enough to cause me thought. Checked the raw water impellor - good so I pulled the exhaust raw water injector and sure enough, it was cactus - severely corroded. I`m currently having a new one made out of stainless. I went through the same exercise with the port engine a year or so ago.
The old one had a hole corroded in the inner sleeve immediately opposite where the salt water was introduced into the outer casing. This meant that the water flowed directly into the exhaust gas stream rather than being introduced into it at the circumference of the inner casing (hope that is clear).
And my question is - why should this matter - why should being squirted directly into the exhaust gasses rather that sprayed in via a ring produce steam -way down the back at the exhaust; after all the amount of water is the same?