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Engine trouble
wrote in message ... Hi, I have a 75HP, 1992, 3 pistons/2 strokes Mariner engine that started to give me trouble yesterday. While a was pulling a tube, the engine suddenly lost power and even at WOT, would not go over 2,600 RPM (while pulling the tube). I tried the boat alone and even at WOT, the RPM would slowly increase up to 3,200 and then jolted to 4,000 and then I had to pull the throttle so it wouldn't go over 5,000 RPM (ie, from 4,000 and 5,000, the engine was behaving normally). Below 3,200 RPM, the engine noise is 'deep' and rough. I had my wife driving the boat while I was watching the engine for any physical anomaly and couldn't see any. There was no sudden linkage movement between 3,200 and 4,000 RPM. The butterflies were fully opened with the throttle at WOT. The only two things I can think of (and that's just guesses) is there are two sets of injectors and one kicks in at 3,200 or there is a second sets of butterflies that opens at 3,200 (but I didn't see any). I had the injectors cleaned last fall and the engine was running smoothly until this happened. Anybody knows what could make the engine behave that way? Or if you know a better newsgroup/forum to post my question, I'm all ear. Thanks! Over temp possible. Maybe low oil in the tank. |
#2
posted to rec.boats
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Engine trouble
On Jun 22, 10:47 pm, "CalifBill" wrote:
wrote in message ... Hi, I have a 75HP, 1992, 3 pistons/2 strokes Mariner engine that started to give me trouble yesterday. While a was pulling a tube, the engine suddenly lost power and even at WOT, would not go over 2,600 RPM (while pulling the tube). I tried the boat alone and even at WOT, the RPM would slowly increase up to 3,200 and then jolted to 4,000 and then I had to pull the throttle so it wouldn't go over 5,000 RPM (ie, from 4,000 and 5,000, the engine was behaving normally). Below 3,200 RPM, the engine noise is 'deep' and rough. I had my wife driving the boat while I was watching the engine for any physical anomaly and couldn't see any. There was no sudden linkage movement between 3,200 and 4,000 RPM. The butterflies were fully opened with the throttle at WOT. The only two things I can think of (and that's just guesses) is there are two sets of injectors and one kicks in at 3,200 or there is a second sets of butterflies that opens at 3,200 (but I didn't see any). I had the injectors cleaned last fall and the engine was running smoothly until this happened. Anybody knows what could make the engine behave that way? Or if you know a better newsgroup/forum to post my question, I'm all ear. Thanks! Over temp possible. Maybe low oil in the tank. Thanks for the very quick reply :-) However, I tried the engine the next morning while the engine was cool and it did the same thing. The oil reservoir is about half full. |
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