I am looking for some help and advice please.
I recently bought a 1979 Seamaster 925 - 30ft yacht, with a Volvo Penta 2002 engine. I had a full survey done but could only get the engine checked ashore by a marine mechanic who wrote a short report saying the engine was fine.
I had a full engine service done straight after buying her - change of oil, filters etc, along with a new cutlass bearing and stern gland replaced for peace of mind.
On my first journey out with her she started fine - using the cold start method, and she ran fine for an hour then on my return to the yard she had a short slowdown in revs where she felt like she was going to stall but didn't, then revs came back up and all was okay again.
The next trip out, she went for 20 mins then slowed down and sped up and repeated this every 5-15 mins, no regularity and when the engine was running at a normal pace. Near to the end of this 1 hour trip she stalled after slowing. I turned the key off and back on a gain and she started perfectly and off she went again.
I then took her on the journey home from Hamble to Chichester and she didn't slow or stall all day, mind you we had lovely weather and sailed most of the day so not necessarily a change.
Today I took her out for a couple of hours and she stalled 4 times, was running up and down the rev's almost the whole time, she felt like she was being strangled and I felt very nervous she was about to pack up. She did start straight back up after each time she stalled.
The only other info I noted was a small cloud of white smoke when I start her up first thing and now a small trail of white smoke all the time. I made a sound recording of her today and will try and upload the file if it helps anyone.
Hope someone can help, the mechanics are saying it's going to be 2-3 weeks before they can take a look due to the time of year.
Sound file link https://jamesesq.wetransfer.com/dl/D...376f980302e579