H180DSC
09-22-2009, 10:31 AM
Hey all,
I have a 1986 seaswirl open bow 16.5' 120 omc (2.3l gm engine w/ 2 jet Rochester). I picked this boat up earlier this year, and have an engine issue. Here is the problem: Running in neutral, the engine revs crisply, and hits 5000 rpm (thats when I let off). When running under load (doesn't matter how many people are in the boat), the max rpm is 3000 rpm. I have a 15.5x15 pitch prop, and a 15.5x13 pitch prop. The max rpm is the same with either prop installed. I have checked compression 145-150 psi on all 4 cylinders. Did a basic tune up: cap, rotor, plugs, wires, which had nil effect. I am a CAT diesel mechanic, and if this was a diesel, it acts like lack of fuel. I am not a gas engine guy, and have been told that it is not a fuel issue b/c it would run hot? The timing was set at 14 deg. btdc. I reset it to 4 deg. as per the valve cover spec., and this had nil effect. The distributor is new, and has mechanical advance. Please Help!!
I have a 1986 seaswirl open bow 16.5' 120 omc (2.3l gm engine w/ 2 jet Rochester). I picked this boat up earlier this year, and have an engine issue. Here is the problem: Running in neutral, the engine revs crisply, and hits 5000 rpm (thats when I let off). When running under load (doesn't matter how many people are in the boat), the max rpm is 3000 rpm. I have a 15.5x15 pitch prop, and a 15.5x13 pitch prop. The max rpm is the same with either prop installed. I have checked compression 145-150 psi on all 4 cylinders. Did a basic tune up: cap, rotor, plugs, wires, which had nil effect. I am a CAT diesel mechanic, and if this was a diesel, it acts like lack of fuel. I am not a gas engine guy, and have been told that it is not a fuel issue b/c it would run hot? The timing was set at 14 deg. btdc. I reset it to 4 deg. as per the valve cover spec., and this had nil effect. The distributor is new, and has mechanical advance. Please Help!!