Superfan99
Recruit
- Joined
- Aug 10, 2012
- Messages
- 2
I have a 96 Mercury 15 hp that I bought last year. The Marina was unsure of the maintenance history, and in spite of the strong stream from the tell tale I decided to replace the impeller this year as a preventative measure(also replaced gear oil and carb gaskets/diaphragms).
The water pressure form the tell tale seems to fluctuate in an odd way. The flow never stops, but even at WOT the flow seems to reduce and then increase in a cyclical manner. The engine was fully warmed up in the video below(ha;f mile run across the bay).
This engine does have a thermostat, so I was thinking that since the water was still very cold (42 degrees) that perhaps the thermostat is actually closing, and then opening back up again. I know on some outboard engines the thermostat should open automatically at WOT, but I couldn't find any documentation that suggested this is the case on this engine. The flow is much stronger at WOT, than it is at idle, but it still drops down to a sputtering stream, then back up to full flow at about the same rate as in the video.
Have any of you ever seen anything like this before? Any ideas?
The water pressure form the tell tale seems to fluctuate in an odd way. The flow never stops, but even at WOT the flow seems to reduce and then increase in a cyclical manner. The engine was fully warmed up in the video below(ha;f mile run across the bay).
This engine does have a thermostat, so I was thinking that since the water was still very cold (42 degrees) that perhaps the thermostat is actually closing, and then opening back up again. I know on some outboard engines the thermostat should open automatically at WOT, but I couldn't find any documentation that suggested this is the case on this engine. The flow is much stronger at WOT, than it is at idle, but it still drops down to a sputtering stream, then back up to full flow at about the same rate as in the video.
Have any of you ever seen anything like this before? Any ideas?