Hey people,
New and digging the advice here. I just upgraded from a 1968 evinrude 65 horse v4 after many many $$$ wich actually is in good running order still (won't complain it was practically free). I bought a late 70's early 80's i would say?, 85 hp merc and it had a slight suspicious rattle, but this is my first foray into the outboard world. Threw it on and ran really good for a while. Out on the water i started to lose power like it was losing fuel pressure. Stopped and played with it a bit and primed it back up and away i went. 2 minutes later it started to slow and died. This time i fired it back up and again it died, tried to turn it over and it was apparently seized solid. Got er to shore and kicked the boat like any newbie would! Took it out of the water and took the cover off found plug four halfway out! no big deal. Got er home and took all the plugs out and cleaned er up a bit threw em back in and it fired right up (remember i tightened number 4) suspicious rattle gone and it wasnt seized. However i thought lets do a compression check and number 3 cylinder was at zero! Was the rattle the loose plug? no. number 4 was down to 125 as when i bought it but the 1 and 2 were 150. Another odd thing i noticed after i pulled all the plugs was number three had on the very inner edge of the plug hole what looked like a buildup of possibly carbon or something in the exact spitting image of the end of the merc plug. i stuck my little finger in there and it just fell off into the cylinder. I see the piston moving inside and other than carbon it looks unmelted. There is a new water pump on it as well. If i stick my finger over the hole and crank it there is somewhat of a slight buildup of pressure but with my experience on car engines im leaning towards a broken valve spring? or tappet/rocker if thats what they call them on outboards? No idea, like i said im a newbie with outboards, but a ticketed auto mechanic. Obviously i should be into a rering and hone with one down to 125 but im lookin for ideas on the zero cylinder.
Thanks!
New and digging the advice here. I just upgraded from a 1968 evinrude 65 horse v4 after many many $$$ wich actually is in good running order still (won't complain it was practically free). I bought a late 70's early 80's i would say?, 85 hp merc and it had a slight suspicious rattle, but this is my first foray into the outboard world. Threw it on and ran really good for a while. Out on the water i started to lose power like it was losing fuel pressure. Stopped and played with it a bit and primed it back up and away i went. 2 minutes later it started to slow and died. This time i fired it back up and again it died, tried to turn it over and it was apparently seized solid. Got er to shore and kicked the boat like any newbie would! Took it out of the water and took the cover off found plug four halfway out! no big deal. Got er home and took all the plugs out and cleaned er up a bit threw em back in and it fired right up (remember i tightened number 4) suspicious rattle gone and it wasnt seized. However i thought lets do a compression check and number 3 cylinder was at zero! Was the rattle the loose plug? no. number 4 was down to 125 as when i bought it but the 1 and 2 were 150. Another odd thing i noticed after i pulled all the plugs was number three had on the very inner edge of the plug hole what looked like a buildup of possibly carbon or something in the exact spitting image of the end of the merc plug. i stuck my little finger in there and it just fell off into the cylinder. I see the piston moving inside and other than carbon it looks unmelted. There is a new water pump on it as well. If i stick my finger over the hole and crank it there is somewhat of a slight buildup of pressure but with my experience on car engines im leaning towards a broken valve spring? or tappet/rocker if thats what they call them on outboards? No idea, like i said im a newbie with outboards, but a ticketed auto mechanic. Obviously i should be into a rering and hone with one down to 125 but im lookin for ideas on the zero cylinder.
Thanks!
