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#1
posted to rec.boats
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Engine trouble
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! |
#2
posted to rec.boats
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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. |
#3
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. |
#4
posted to rec.boats
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Engine trouble
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#5
posted to rec.boats
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Engine trouble
I think you got the wrong group. This one is alt.loogy.bull**** off-topic. |
#6
posted to rec.boats
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Engine trouble
On Sun, 22 Jun 2008 19:30:16 -0700 (PDT),
wrote: Anybody knows what could make the engine behave that way? If the VRO has been acting up, you could have fouled plugs, the carbs might need cleaning, could be a soft power pack - there are any number of possibilities with that type of RPM range. I would suspect either plugs or something along the lines of a power pack. |
#7
posted to rec.boats
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Engine trouble
On Jun 23, 12:23*am, Larry wrote:
wrote in news:75891839-5d1f-46f6-aa2c-df6033521575 @x35g2000hsb.googlegroups.com: I had the injectors cleaned last fall and the engine was running smoothly until this happened. A '92 Mariner has injectors, not carbs?? Does it have a PRIMER BULB? Primer bulb on the fuel line? Yes I have one. Now that I think about it, it has oil injector but probably carburetor... |
#8
posted to rec.boats
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Engine trouble
On Jun 23, 12:30*am, "Eat Me, Trolls" wrote:
I think you got the wrong group. This one is * * * alt.loogy.bull**** off-topic. Like I said in my original post: "Or if you know a better newsgroup/forum to post my question, I'm all ear". So? Do you have a better one? |
#9
posted to rec.boats
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Engine trouble
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#10
posted to rec.boats
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Engine trouble
On Jun 23, 6:31*am, Short Wave Sportfishing
wrote: On Sun, 22 Jun 2008 19:30:16 -0700 (PDT), wrote: Anybody knows what could make the engine behave that way? If the VRO has been acting up, you could have fouled plugs, the carbs might need cleaning, could be a soft power pack - there are any number of possibilities with that type of RPM range. I would suspect either plugs or something along the lines of a power pack. I'll check the plugs but at idle, the engine runs fine. I would think a foul plug would show its color more at low RPM. The transition is ALWAYS at 3,200 RPM. Once it reaches 3,200 RPM (on the dot), it gets to 4,000 RPM within a fraction of a second (it feels like a sport car taken off) as if it got the correct air/gas ratio suddenly. |
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