ehernandez1200
Cadet
- Joined
- Aug 2, 2009
- Messages
- 9
Hello,
I hope that someone can shed some light on an issue that i'm running into. I own a 1987 Searay 230 with an Alpha one outdrive and a Mericruser 5.7L 260 motor (small block chevy). It is the original motor, but it has been reworked and it's been very good to me over the last few years that I've owned it (knock on wood). I try not to spare any expense with this boat. At the start of the season, i had an oil change and tune-up done to the motor. The outdrive was serviced at the end of last season. The motor was misfiring when we tried to run it at the start of the season, and the timing had to be adjusted.
The boat runs fine at WOT, staying at about 125 degrees F. When I go through the no-wake zones, the temprature of the motor climbes to about 150 degrees F. Once I open the throttle up again, it cools back down to a comfortable 125 degrees F. I cannot reproduce this problem at the dock, even if I let the motor run at low RPM without putting it in drive. I only run into this issue when I am out to sea. The motor is raw-water cooled.
This temp spike never occured before this season. This is the first year that the temp jumps up when I let off the throttle. At this point I'm not sure if I should be concerned about this, or if this is normal. I've only owned the boat for 3 years, and I did not tune it up, change the oil or timing during the first two years (i know that's bad practice, but I was told that everything was in good shape, and it wasnt necessary).
My question is, can a tune-up and oil change cause the issues that I am describing? Could the timing adjustment be the issue? Should I be concerned at all? What is the optimal operating temprature for a raw-water 1987 Mercruiser 5.7L 260? I'm hoping that someone can help. I spoke to my mechanic and we left it off that I would call him and have him come to the dock and check it out. Before I pay to have him come by, and potentially pull the boat out of the water (major pain in the neck), I want to make sure that this is even necessary. I am not running a termostat. There was a thermostat in place, but it was not opening so I removed it. All feedback is appreciated. Thank you,
Eric H.
I hope that someone can shed some light on an issue that i'm running into. I own a 1987 Searay 230 with an Alpha one outdrive and a Mericruser 5.7L 260 motor (small block chevy). It is the original motor, but it has been reworked and it's been very good to me over the last few years that I've owned it (knock on wood). I try not to spare any expense with this boat. At the start of the season, i had an oil change and tune-up done to the motor. The outdrive was serviced at the end of last season. The motor was misfiring when we tried to run it at the start of the season, and the timing had to be adjusted.
The boat runs fine at WOT, staying at about 125 degrees F. When I go through the no-wake zones, the temprature of the motor climbes to about 150 degrees F. Once I open the throttle up again, it cools back down to a comfortable 125 degrees F. I cannot reproduce this problem at the dock, even if I let the motor run at low RPM without putting it in drive. I only run into this issue when I am out to sea. The motor is raw-water cooled.
This temp spike never occured before this season. This is the first year that the temp jumps up when I let off the throttle. At this point I'm not sure if I should be concerned about this, or if this is normal. I've only owned the boat for 3 years, and I did not tune it up, change the oil or timing during the first two years (i know that's bad practice, but I was told that everything was in good shape, and it wasnt necessary).
My question is, can a tune-up and oil change cause the issues that I am describing? Could the timing adjustment be the issue? Should I be concerned at all? What is the optimal operating temprature for a raw-water 1987 Mercruiser 5.7L 260? I'm hoping that someone can help. I spoke to my mechanic and we left it off that I would call him and have him come to the dock and check it out. Before I pay to have him come by, and potentially pull the boat out of the water (major pain in the neck), I want to make sure that this is even necessary. I am not running a termostat. There was a thermostat in place, but it was not opening so I removed it. All feedback is appreciated. Thank you,
Eric H.
