.....Not a boat engine however Im hoping one of you diesel heads might know...
I am having problems with my Passat V6 diesel which has 85000 on the clock and is 3 years old.
The engine has developed an annoying vibration which I am being told may be a missfire due to Pump or Injector issues. The vibration happens pretty much all the time at idle the engine feels slightly lumpy then as you accelerate it becomes a noticeable thrumming vibration. It happens on overrun as well and also when in neutral and stationary so is definately not a gearbox issue.
The car recently had a cambelt change and since then the problem occured then went away for a week and is now back again, so I don't think the timing or cambelt is at fault otherwise it would not have gone away for the week.
The car also had a full service at the time including filter change so I am hopeful that a fuel blockage is the culprit
is it down on power at all? if it was a miss fire i would expect you would have noticed a drop in power. Have you checked the engine and exhaust mountings? nothing rubbing the body? V6 engines are inherently unbalanced and will transmit more vibration to the bodywork than a straight 6 or a v8 though i guess VAG use counterrotating balancer shafts to combat this.
i suppose it could be a slight missfire maybe caused by air in the system, any visible damp patches on fuel system where air could get in?
It still pulls ok however it may be down on power a little, not to sure. No air leaks can be detected. It has only been doing this since the service so about 500 miles now.
I am hoping its not the pump also MDT as the best price I have had so far is £800 for a recon unit.
I am taking it to a diesel specialist who will test the injectors etc. so hope to have more info tomorrow.
I assume if itls 3 years old it's a "common rail" (i.e electonic injectors as opposed to the pump doing all the work). If so try unplugging them all, and check the contacts / spray some WD40 (other types of "save the world" oil are available ) in & reconnect. I know dozens of petrol cars with "faulty injectors" when in most cases the plug had worked loose or similar.
It's worth chucking a whole bottle of diesel redex injector cleaner into 1/4 tank of fuel. It'll smoke a bit but if there's crud in there it'll clean it out quite well.
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) in & reconnect. I know dozens of petrol cars with "faulty injectors" when in most cases the plug had worked loose or similar. 
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