Volvo Penta D4 - Port Engine Shutting Down on Shift into Neutral

[gnomus]

I have a Jeanneau Prestige 34 with twin Volvo D4 260HP engines. I'm getting an intermittent problem with the Port engine switching itself off when I shift into Neutral from both Forward and Reverse. When it does this there are no warning lights, of any sort. And the Port engine will always restart straight away. The problem is intermittent - as can be imagined it comes to the fore when operating/berthing within the marina when there might be quite frequent gear shifts.

The boat was out of the water for a while back in April, and I had both actuator cables replaced at that time to see if that would help the issue. I thought that it had, however, it seems to be back again. The Volvo guys have had their funny computer plugged into the engines and have found no faults. Our engineer said that he had temporarily swapped in a different actuator, however that had made no difference. At the moment, therefore, the problem remains undiagnosed.

Anyone any ideas?

Thanks, Steve

 

[LynnC]

If I recall correctly, I think that the system is programmed to stop the engine when nutral is selected but the gearbox is stuck in gear. The idea being it is safer to have a stopped engine rather than having an ehgine powering you on. This does not post an error code.
You can get a situation where the gearbox does disengage but with a delay sufficent for the system to think it is stuck in gear - hence the engine stops.
I suspect you are aware of this because you have been checking the actuators and cables.
Assuming you have these items correct, I am sorry to say the only thing left is the gearbox.