Hi all,
Because of an ongoing exhaust problem I am considering changing my Nanni 4-60 turbo back to the normally aspirated 50 hp engine. I understand that means a new prop but the rest looks just mechanical as the N60 is the same engine as the N50 with a turbo fitted.
The exhaust problem is corrosion at the seawater injection point, the engine has only 99 hours since new and the injection elbow has been repaired twice. I think the problem has something to do with the fact that the water lock is level with engine and not below as is preferred. The water lock capacity is larger than the 50 hp model and as a result won't fit in the only avaiable space lower than the engine. The 76 mm exhaust hose also takes up valuable storage space.
I put a ball valve between the exhaust outlet and the waterlock which, after the engine is shut down, drains any excess water into the bilge and prevents any water from flowing back up into the engine but the corrosion has returned, so I'm out of ideas.
I fitted the new engine as a replacement for a 50 hp Perkins so I figure the power loss is not going to dramatically affect the boats performance.
I chose and fitted the engine and because I'm not a mechanic I might have missed something basic during the exercise.
Any thoughts would be greatly appreciated!