Falling Star
Active member
Hi all,
Can anyone advise me please? My Merry Fisher 805 has developed a fault as follows:
The engine starts easily every time and seems to run for the first few minutes without any excessive smoke or problems. After around 3 or 4 minutes at a fast tickover (800 revs) it starts to splutter and produces a lot of white smoke. This continues for a further few minutes after which it improves. When testing under load she will achieve around 20 knots and seems quite responsive. Hardly any smoke. Return to the marina and all is well again at tickover.
Start her up a few days later and it is the same sequence as before. Starts, runs ok for a bit, loads of smoke/misfire, then OK again. The engine is a standard Nanni 4.390, around 5 years old, with 400 hours on the clock.
The filters were changed recently and a visual check of the fuel indicates that there is no water. The injectors have been removed and new nozzles fitted. No improvement.
What should I check next?
All ideas welcome. Thank you.
Can anyone advise me please? My Merry Fisher 805 has developed a fault as follows:
The engine starts easily every time and seems to run for the first few minutes without any excessive smoke or problems. After around 3 or 4 minutes at a fast tickover (800 revs) it starts to splutter and produces a lot of white smoke. This continues for a further few minutes after which it improves. When testing under load she will achieve around 20 knots and seems quite responsive. Hardly any smoke. Return to the marina and all is well again at tickover.
Start her up a few days later and it is the same sequence as before. Starts, runs ok for a bit, loads of smoke/misfire, then OK again. The engine is a standard Nanni 4.390, around 5 years old, with 400 hours on the clock.
The filters were changed recently and a visual check of the fuel indicates that there is no water. The injectors have been removed and new nozzles fitted. No improvement.
What should I check next?
All ideas welcome. Thank you.