Michael: I was wondering if the design you show in the picture should have more of a U shape to the outlet to reduce the backwash coming up the back side of the boat. You stated that there was a thimble full of water in the exhaust. From the past marine experience I have found the exhaust manifold, if it is water cooled, should be pressure tested to ensure that there are no pin holes in the casting. I changed a whole bunch of them on V-12 Detroit marine engines as the casting had some issues and water was getting in where it shouldn't have. Another thing is have the mechanic pressurize the cooling system and remove the air box cover to check for water or coolant enetering the piston from the injector tube seat or a possible crack in the cylinder head. Just some ideas to assist your problem.
Roger On Oct 5, 5:46 am, "Michael McCartney" <[email protected]> wrote: > Hi Alex and Roger > > All three times this happened to me I dropped the exhaust manifold and found > a cup or so of SALT water. I think the only way salt water can get there is > though the exhaust system. I pulled the injectors and was able to bar the > engine over. It always seems to happen when I am 100 or so miles from a > mechanic that could put it all back together again. Lots of time running on > one engine. :-) > > I live in Scottsdale and leave the boat in Sitka for the winters. I have a > mechanic there that will be taking it apart this winter. His estimate is > $3000 to $6000 depending on what he finds when he gets it apart. This > engine was running fine when we took the boat out of the water, it just > smokes a lot until it warms up. > > I replaced the exhaust risers with new ones that were custom made ($3500) > and identical to the originals. The originals were thirty years old. I was > never sure that the originals were the problem but a mechanic thought that > they were. I have attached a picture of one of them I replaced. > > Good luck with your repairs. > > Michael > > PS When all is said and done I think the idea of holding the stop button a > few seconds after the engine quits running is a big part of the solution. > The 671 is still used by a lot of the fishing boats in Southeast Alaska. I > have talked with a number of boat captains about my issues and have been > given that pieces of advice a number of times > > P1000804.JPG > 290KViewDownload > > P1000805.JPG > 288KViewDownload > > P1000806.JPG > 285KViewDownload > > P1000807.JPG > 315KViewDownload > > P1000808.JPG > 335KViewDownload > > P1000809.JPG > 304KViewDownload --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en -~----------~----~----~----~------~----~------~--~---
