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  1. R

    75 HP Mercury Oil level Alarm

    I have a constant alarm and understand it has been been triggered from the oil sensor that is in the oil tank. Is there a way to replace the sensor or to get it to work properly without replacing the entire tank.
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    75 hp murcury 1999 model warning alarm

    Can any body give me the location of the warning module and the powerhead temperature sensor. I have the detailed maintenance book but there are no locations shown. I checked the engine top to bottom and cant find either. My problem is a constant alarm when running or after cool down when the...
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    1976 70HP Overheat & Teltale

    I have written 2 posts recently and got great response thanks everyone. This motor is used in Louisiana in saltwater and mainly during the summer. Could I actually remove the thermostat thus eliminating 1 potential problem area because of corrosion. There are also pressure control valves in...
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    1976 70hp modification for teltail water flow

    Hi everyone, I have a 1976 johnson 70 HP thet overheated. Some people responded on a compression check and also said on this site there should be a post about adding a water teltale. I have checked many pages but cant find a post on this subject. Is there a way to search this site for a specific...
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    76 model 70 hp overheating

    I ran my 70 hp engine until it lockup. The overheating alarm did not sound and i did not know water was not getting to the engine. Now I want to check compression 1st what should the PSI be? Also could a stuck thermostat have stopped the water flow because the water pump is fairly new. Are there...
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    1999 Mercury 75 rough & noisy idle

    I am about to buy a 75hp mercury that has a pretty rough idle. It idles at 700-750 RPM. When placed in gear the idel becomes slightly rougher but now with a knocking type sound. When increasing rpm to about 1000 to 1100 all goes away, rapid acceleration is good up to 5100 rpm. Just this noisy...
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