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Message 4 of 4
Posted by member Stephen Izatt on Wednesday 21 September 2016
Our turbo was sent away for reconditioning as the gate valve was freed up but the turbo wasn't spinning freely and it all looked very coked up.
It was returned in a few days, refitted and we took her out to find that we now have a much more confident boat - still a slight, but I think normal lag, nothing like the ages it was taking before. And once the turbo has kicked in, the throttle and speeds are very responsive making us feel in control and giving us much more comfort in rough seas.
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Message 3 of 4
Posted by member stephen on Sunday 4 September 2016
Hi
Thanks for the hints on cause. Seems that following another sea test with a Yanmar specialist mechanic, it could be the turbo waste gate / valve. On a quick inspection he thinks it could be stuck open. This would mean that there is a long delay before sufficient pressure builds up in the system to initiate the turbo.
Looking around on line for that specifically, has shown similar incidences that share seemingly common symptoms. We will hopefully see on Tuesday when he removes the component to try cleaning it and freeing it's movement. Fingers crossed.
When I bought the boat the previous owner had been in ill health and not used her much at all over two years. Almost all I have had to deal with comes down to lack of use. This could be another and I really hope, the last.
S
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Message 2 of 4
Posted by member david evans on Thursday 1 September 2016
Hello Stephen,
have you checked your fuel tank air vent for a partial blockage. From experience, foreign bodies, cobwebs or a partially crimped vent pipe would cause the above symptoms. Lack of air in means lack of fuel out.
I have also seen a similar symptoms caused by a dodgy lift pump diaphragm.
Good luck,
David.
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Message 1 of 4
Posted by member stephen on Tuesday 30 August 2016
I am now desperately seeking a solution having tackled heavy seas without the ability to ride over waves when required of get out of the way of fast ships, ferries and other vessels on a three hour crossing of a busy Solent. I am a hefty four figure sum down with still no remedy.
The Yanmar deisel engine on our 2000 Mariner revs up nicely when out of gear. It will cruise along happily at 1800 revs. However one of two things happens when I apply the throttle.
1. It takes 30-40 seconds before the revs build and the turbo comes in to take us up onto the plane. Or
2. The revs just don't increase at all no matter how much throttle is applied. Especially when pushing tide or waves. I.e. Loading the engine.
This is despite changing fuel filters and air filters. We had the bottom jetted for the second time this season just days before, scraped and rubbed down the checked prop.
We have pumped out the tank and cleaned it.. We tried running on an alternative fuel source. We have since kept the tank topped up and used marine 16 each fill.
There is no excessive or black smoke. There appears to be no water in the fuel.
Any ideas?
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