Mauro Brisola
Seaman Apprentice
- Joined
- Jun 13, 2016
- Messages
- 31
I had Bravoits in my 350 MAG. It was with 165 hours. It is 185 hours now.
After mechanic doing the Bravoits job I notice system was not perfect. Despite using without big issues. Usually I cruise at about 3500 rpm. Temperature is steady 154 - 158 degrees. If going above 4000 rpm it was possible to see temperature increasing.
This weekend returning from a 30 miles trip (60 round) I played with WOT during some minutes. I knew temperature would increase. After reaching 168 I returned throttle to 3000 rpm to cool down engine. What happend after: temperature did not went down to 158 but instead to 162! At this moment I started thinking about a water blockage caused by the high water flow during WOT. Even because before this moment I could cruise 3000 ou 3500 rpm all day with lower engine temperature (158).
Continuing the last 20 miles, after a long time steady at 162, temperature started increasing slowly. Up to 178 when alarm went off. I turned engine off and wait 40 minutes. Thinking in call marina support for a tow. But after it I started engine and temperature went to normal 158 again and cruised at 3500 rpm the last 5 miles without problem.
My initial theory: there is something loose at some engine/outdrive place causing water blockage in high rpm/speeds. During the Bravoits problem I had a impeller failure (pictures attached). Then I started thinking were the lost impeller fins could be.
Now I found some impeller fins pieces looking by the propellers exaust holes. It is possible to see at leat one small rubber piece stuck in the exhaust passage and others loose before the passages. I will remove the propeller to clean this fins pieces.
My questions:
What the chances of the problem being caused by exhaust blockage at that point? (Just before the propellers)
What the other water engine water passages/hoses points to look for the fins pieces?
After mechanic doing the Bravoits job I notice system was not perfect. Despite using without big issues. Usually I cruise at about 3500 rpm. Temperature is steady 154 - 158 degrees. If going above 4000 rpm it was possible to see temperature increasing.
This weekend returning from a 30 miles trip (60 round) I played with WOT during some minutes. I knew temperature would increase. After reaching 168 I returned throttle to 3000 rpm to cool down engine. What happend after: temperature did not went down to 158 but instead to 162! At this moment I started thinking about a water blockage caused by the high water flow during WOT. Even because before this moment I could cruise 3000 ou 3500 rpm all day with lower engine temperature (158).
Continuing the last 20 miles, after a long time steady at 162, temperature started increasing slowly. Up to 178 when alarm went off. I turned engine off and wait 40 minutes. Thinking in call marina support for a tow. But after it I started engine and temperature went to normal 158 again and cruised at 3500 rpm the last 5 miles without problem.
My initial theory: there is something loose at some engine/outdrive place causing water blockage in high rpm/speeds. During the Bravoits problem I had a impeller failure (pictures attached). Then I started thinking were the lost impeller fins could be.
Now I found some impeller fins pieces looking by the propellers exaust holes. It is possible to see at leat one small rubber piece stuck in the exhaust passage and others loose before the passages. I will remove the propeller to clean this fins pieces.
My questions:
What the chances of the problem being caused by exhaust blockage at that point? (Just before the propellers)
What the other water engine water passages/hoses points to look for the fins pieces?
