BostonSearay
New Member
2005 SD 320. Merc 350mags. Last season after experiencing reduced RPM and vibration from my port engine (wouldn't go over 2,600rpm under load). Mechanic suggested a full tune up.
they replaced, spark plugs, cap and rotors, fuel filters, flame arrestor.
I ended up gaining about 200 rpm. I called him and he said that he couldn't think of anything else and that he would take a look during the off season.
Went to a different mechanic during the off season and he noticed a faulty distributor, which he replaced. We also replaced manifolds and risers. Took it out for the first time last week, and boat was overheating and alarm went off, due to low coolant. I added coolant and resumed my trip. Vibration is gone, however the Port engine won't rev over 3200 rpm and SB won't rev over 4200rpm. I called him and he advised that I disconnect the batteries in order to reset the Guardian safety, which most likely kicked in after the overheat incident. I was also advised by another mechanic to replace the anti-siphon valves and add fuel system cleaner in my fuel.
I noticed that there are no anti-siphon valves on the fuels tanks just a line going to the electric pumps, can it closer to the engine?
I am really frustrated with this problem. 400 hours on the engines and always professionally serviced and maintained.
Another issue is that all mechanics are at least 3 weeks out. Season is too short in New England.
Any advice would be greatly appreciated.
they replaced, spark plugs, cap and rotors, fuel filters, flame arrestor.
I ended up gaining about 200 rpm. I called him and he said that he couldn't think of anything else and that he would take a look during the off season.
Went to a different mechanic during the off season and he noticed a faulty distributor, which he replaced. We also replaced manifolds and risers. Took it out for the first time last week, and boat was overheating and alarm went off, due to low coolant. I added coolant and resumed my trip. Vibration is gone, however the Port engine won't rev over 3200 rpm and SB won't rev over 4200rpm. I called him and he advised that I disconnect the batteries in order to reset the Guardian safety, which most likely kicked in after the overheat incident. I was also advised by another mechanic to replace the anti-siphon valves and add fuel system cleaner in my fuel.
I noticed that there are no anti-siphon valves on the fuels tanks just a line going to the electric pumps, can it closer to the engine?
I am really frustrated with this problem. 400 hours on the engines and always professionally serviced and maintained.
Another issue is that all mechanics are at least 3 weeks out. Season is too short in New England.
Any advice would be greatly appreciated.