I purchased an 81 16.5' OMC
It had a 3.8l V6 i quickly found was cracked.
I took the boat to the motor shop and quickly decided to install a 4.3 in its place. We used most of the parts from the original motor that was able.
I payed a guy to install the motor into my boat. When i picked it up it ran amazing. Purrrred like a little honda. The motor was balanced to so there was no vibration. I took it out on the lake the past weekend and it ran, well good. It jumps out of the water but only pulls 3500RPM's WOT? Seems strange but i dont know boats. When the motor was built they put in a "boat" cam? I think its for more torque but please explain. So we tooled around the small lake for a few hours just fine.... I was doing about 3krpms (no MPH avail) and dropped it to idle. The motor then died and wouldnt start. My and my bro took the top off the carb to let it breath. He has the idea maybe it flooded from the quick deceleration. Nothing... I let it sit another 5 mins... and we got it started by manually manipulating the carb to give it "gas" and we hobbled it to the marina. It didnt like running low RPM's. I just figured i was out of gas. I get the boat home put 5 gal gas into it (20gal tank) and fire it up. Its running and dying alot. My motor is a 4.3 block, 3.8 intake, 2bbl rochester carb, points dist. 3.8 heads, Not sure about what distributor we used. New cap, wires, plugs.... I replaced the coil and it seems to run with out dying now. The big issue im having is a vibration. I have checked the plugs and the tips dont look abused. I almost wanna call it a surg maybe? it will run for like 5 seconds then sounds like it maybe misses a cylinder? I checked the cap its bone dry. I also checked the dist. for loosness(rotation). Nothing. I know nothing about carbs but i replaced the fuel/water filter, and the filter at the base of the carb to.
Someone tell me what the heck to do! I wanna take her out again but i dont want it to rip the motor mounts or something.
I want it to run smooth again and i want it to get better speed and rpm's
Steve
It had a 3.8l V6 i quickly found was cracked.
I took the boat to the motor shop and quickly decided to install a 4.3 in its place. We used most of the parts from the original motor that was able.
I payed a guy to install the motor into my boat. When i picked it up it ran amazing. Purrrred like a little honda. The motor was balanced to so there was no vibration. I took it out on the lake the past weekend and it ran, well good. It jumps out of the water but only pulls 3500RPM's WOT? Seems strange but i dont know boats. When the motor was built they put in a "boat" cam? I think its for more torque but please explain. So we tooled around the small lake for a few hours just fine.... I was doing about 3krpms (no MPH avail) and dropped it to idle. The motor then died and wouldnt start. My and my bro took the top off the carb to let it breath. He has the idea maybe it flooded from the quick deceleration. Nothing... I let it sit another 5 mins... and we got it started by manually manipulating the carb to give it "gas" and we hobbled it to the marina. It didnt like running low RPM's. I just figured i was out of gas. I get the boat home put 5 gal gas into it (20gal tank) and fire it up. Its running and dying alot. My motor is a 4.3 block, 3.8 intake, 2bbl rochester carb, points dist. 3.8 heads, Not sure about what distributor we used. New cap, wires, plugs.... I replaced the coil and it seems to run with out dying now. The big issue im having is a vibration. I have checked the plugs and the tips dont look abused. I almost wanna call it a surg maybe? it will run for like 5 seconds then sounds like it maybe misses a cylinder? I checked the cap its bone dry. I also checked the dist. for loosness(rotation). Nothing. I know nothing about carbs but i replaced the fuel/water filter, and the filter at the base of the carb to.
Someone tell me what the heck to do! I wanna take her out again but i dont want it to rip the motor mounts or something.
I want it to run smooth again and i want it to get better speed and rpm's
Steve