WE have a 2007 Mercury 25 HP engine. When we put the boat in the water yesterday an alarm went off. We checked the oil and it was good. What else should we look for. This is a used engine so we have no manual for it. The Serial No, on the engine is OR144863. The alarm is a constant buzzing sound. When we are parked with engine on no problem but as soon as we drive out of the slip the alarm goes on.
The alarm is the overheat horn. It means that your motor isn't pumping water from the bottom of the leg and through the engine cooling ports. You will see water shooting out the side of the motor when it starts getting hot, and if you're not seeing the water shoot out and the horn is on then chances are the pump impeller on the leg is shot. You should never start a boat motor (outboard or any other type of boat motor) without having it sitting in the water or with a water calliper with a garden hose attached on the lower inlets of the leg. If you run it without water you will melt the rubber impeller and damage the engine if it's run too long without water cooling. Take it in to a qualified tech to replace the impeller.
SOURCE: Yamaha outboard engine
Procedure for carb. adjustment for 1992 Yamaha 30 h.p. 2 cycle outboard motor
SOURCE: need firing order for a 86 chrysler outboard boat engine
Firing order 1 2 3 is common on most three cylinder outboards. 1 3 2 is the only other combination.
SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
Mark
SOURCE: suzuki outboard motor 65 hp --oil sensor keeps
assuming you are not out of oil in your oil reservoir you probably have a bad sending unit in the reservoir. never bypass it or eliminate it as you could permanently damage your motor or ruin it if you ran it out of oil.
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