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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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<blockquote data-quote="Pappy" data-source="post: 274284" data-attributes="member: 3278"><p>Well you have at least two issues so far. First issue. Your gearcase is full of water and oil. That milky oil is that color because it is mixed with water. </p><p>Another related issue. Water pumps do not grind. Pull the lower plug in your gearcase and see if there are any metal shavings in the oil coming out of it. </p><p>Second issue. Your engine should actually cool down a little once at planing speeds. If you burned your hand your engine is overheating big time, regardless of visible water stream and I would be looking at that as your main power issue. Would be interesting to see what your compression numbers are when the issue is occurring. I suspect they are much lower. You may even be able to feel a difference if you try to start it immediately. Be honest on this answer so no time is wasted on troubleshooting. </p><p>You mentioned water droplets on the plugs? If you are getting water in your cylinders this can be a cause as well but the normal pattern on the plug is that they will be very clean looking.</p></blockquote><p></p>
[QUOTE="Pappy, post: 274284, member: 3278"] Well you have at least two issues so far. First issue. Your gearcase is full of water and oil. That milky oil is that color because it is mixed with water. Another related issue. Water pumps do not grind. Pull the lower plug in your gearcase and see if there are any metal shavings in the oil coming out of it. Second issue. Your engine should actually cool down a little once at planing speeds. If you burned your hand your engine is overheating big time, regardless of visible water stream and I would be looking at that as your main power issue. Would be interesting to see what your compression numbers are when the issue is occurring. I suspect they are much lower. You may even be able to feel a difference if you try to start it immediately. Be honest on this answer so no time is wasted on troubleshooting. You mentioned water droplets on the plugs? If you are getting water in your cylinders this can be a cause as well but the normal pattern on the plug is that they will be very clean looking. [/QUOTE]
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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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