I've recently put a new reman 460 in my boat and I'm having some issues. First some background:
I purchased this boat in 2017. It was my understanding the 460 that was in the boat was a fairly new reman/rebuild, but the boat had sat 6 years without any use. So, we stripped out the old ignition system, and replaced with a pertronix distributor, replaced the cap and rotor, ignition wires, valve covers, put a new carb on (Holley 600), new starter...basically replaced all replaceable components as they looked weathered from sitting so long.
Started that motor up, ran great for about half the summer. Started developing a power/fuel issue. When I would gas the boat, it would run up to about 3800-3900 rpm, then it would drop back down to 3000-3200 rpm. If I ran the boat for awhile, it would start getting fuel/power again. End of the season I had a buddy look at it, he discovered the cam was going bad (we screwed up and didn't prelube the engine before running it). So, that winter we replaced the cam, that spring we broke in the cam, and ran the boat 1 or 2 times, still had same power/fuel issue. Was not able to get the boat in the water the rest of the summer.
This spring, we put the boat in and still had same fuel/power issue. We messed with the set idle screws and that seemed to clear up the problem. I then ran the boat about 3-4 hours, then sucked a valve, doing considerable damage...this brings me to the current reman we have installed.
Got the reman and all components installed (reman was from Summit), put the boat in to fire it up and start cam break in. Boat fired great...only odd thing, was the timing at 1200 rpm was showing about 30*. When I would turn it back to 10* it would start stalling out. So I left the timing advanced and proceeded with break in of the cam and planned to adjust timing after cam was broke in. After 10 minutes the motor started running really rough, sputtering and stalling out, then it died. We could not get it to restart, and if it did restart, it would run like crap than die.
We went and replaced the new spark plugs with newer spark plugs, messed with the timing, checked compression...still nothing.
Yesterday I took the carb to a mechanic to have him look at it. He tipped the carb a little and fuel was dumping out of the front bowl. So he adjusted the float a bit, he also said it looked to him like the float had a scratch and seemed a little heavy. On my way out, the mechanic asked about the PCV valve...I checked and sure enough the valve was bad...we suspect this in conjuction with the adjustment of the set idle screws may have led to the original 460 blowing.
I installed a new pcv valve, and with floats adjusted, went to start it again last night. It seemed a little better, as it would start for a few seconds, sputter, cough and run rough, then die. We tried adjusting the timing several times, but that never really got us anywhere.
I am going to pull the distributor out today and make sure the gear is functioning properly (I read there is a shear pin and that gear could be free spinning???) I also still suspect there may be a fuel issue. Just looking for any other ideas before I get a mechanic and dump a bunch more money into this situation.
thanks for any help/advice
I purchased this boat in 2017. It was my understanding the 460 that was in the boat was a fairly new reman/rebuild, but the boat had sat 6 years without any use. So, we stripped out the old ignition system, and replaced with a pertronix distributor, replaced the cap and rotor, ignition wires, valve covers, put a new carb on (Holley 600), new starter...basically replaced all replaceable components as they looked weathered from sitting so long.
Started that motor up, ran great for about half the summer. Started developing a power/fuel issue. When I would gas the boat, it would run up to about 3800-3900 rpm, then it would drop back down to 3000-3200 rpm. If I ran the boat for awhile, it would start getting fuel/power again. End of the season I had a buddy look at it, he discovered the cam was going bad (we screwed up and didn't prelube the engine before running it). So, that winter we replaced the cam, that spring we broke in the cam, and ran the boat 1 or 2 times, still had same power/fuel issue. Was not able to get the boat in the water the rest of the summer.
This spring, we put the boat in and still had same fuel/power issue. We messed with the set idle screws and that seemed to clear up the problem. I then ran the boat about 3-4 hours, then sucked a valve, doing considerable damage...this brings me to the current reman we have installed.
Got the reman and all components installed (reman was from Summit), put the boat in to fire it up and start cam break in. Boat fired great...only odd thing, was the timing at 1200 rpm was showing about 30*. When I would turn it back to 10* it would start stalling out. So I left the timing advanced and proceeded with break in of the cam and planned to adjust timing after cam was broke in. After 10 minutes the motor started running really rough, sputtering and stalling out, then it died. We could not get it to restart, and if it did restart, it would run like crap than die.
We went and replaced the new spark plugs with newer spark plugs, messed with the timing, checked compression...still nothing.
Yesterday I took the carb to a mechanic to have him look at it. He tipped the carb a little and fuel was dumping out of the front bowl. So he adjusted the float a bit, he also said it looked to him like the float had a scratch and seemed a little heavy. On my way out, the mechanic asked about the PCV valve...I checked and sure enough the valve was bad...we suspect this in conjuction with the adjustment of the set idle screws may have led to the original 460 blowing.
I installed a new pcv valve, and with floats adjusted, went to start it again last night. It seemed a little better, as it would start for a few seconds, sputter, cough and run rough, then die. We tried adjusting the timing several times, but that never really got us anywhere.
I am going to pull the distributor out today and make sure the gear is functioning properly (I read there is a shear pin and that gear could be free spinning???) I also still suspect there may be a fuel issue. Just looking for any other ideas before I get a mechanic and dump a bunch more money into this situation.
thanks for any help/advice