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Volvo Panta D3 REV range question

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burkstar

Contributing Member
Hello all

I have just purchased a boat which is fitted with a D3-130
The boat is an Aquafish 23 (23 feet planning hull)

I noticed that while on the sea trial the boat performed well, even better than expected but only revs to maximum 3000rpm
At 2500rpm the boat gets up on the plain quickly and cruised at 17/18 knots flat out at 3000rpm she got up to a steady 25 knots which is, as ive been advised about spot on but the spec for my engine says it should rev to 4000rpm

It really makes no sense to me, all seems well, it purs like a kitten, doesn't seem in any way under stress, accelerates great, turbo seems to work fine, whistles like it should so I am seeking advise please.
The bottom is spotless, the engine has just been fully serviced it performs as well if not a bit better than I expected yet the rev issue confuses me?

I cant get any previous info as the whether it used to rev round to 4000rpm because the previous owner is no longer with us.
I did purchase the boat at a very very reasonable price.

One other issue, the diagnostic says there is water in the fuel yet I am advised by the boat yard that they have checked everything and that really isn't the case. Could that have something to do with the rev issue?

I haven't yet had the opportunity the run the engine up out of the water to see if it will then rev to 4000rpm.

That's about all I can tell you, any advised would be very appreciated.
 
Usually indicative of an overpropped boat. This usually results when someone wants more speed out of their boat and swap the original prop out for one with a steeper ( numerically higher) pitch. This "loads down" the engine so it won't get to factory WOT. 130HP is not a lot of HP for a 23 ft hull.


To check to see if it will reach 4000 RPM, you don't need to run the engine out of the water, just shift into neutral (briefly!).
 
sandkicker said:
Usually indicative of an overpropped boat. This usually results when someone wants more speed out of their boat and swap the original prop out for one with a steeper ( numerically higher) pitch. This "loads down" the engine so it won't get to factory WOT. 130HP is not a lot of HP for a 23 ft hull.


To check to see if it will reach 4000 RPM, you don't need to run the engine out of the water, just shift into neutral (briefly!).
Click to expand...


Im going to get the engine plugged in for a diagnostic early next week and go from there.
Seems the right place to start.

Thanks Gents
 
After some work I finally got the boat out on the water this evening.
Boat was still only revs round to 3k but was cruising nice at 2500 revs for about an hour, I was up and down on the rev range as where I keep the boat its a bit tricky and shallow in places.
Was fine for about an hour but I came down on the revs for yet another tricky bit and then it wouldn't rev above 2k for some reason.
There are no engine faults showing but its as if the turbo has stopped working.
I did knock it out of gear and reved it and it reved round no problem but that distinctive turbo whistle has gone when you come off the throttle.
Only thing I can think of is I did slam the boat off a large wave but for the next 15 mins the boat was fine?
Could I of knocked something loose ?

Please help, any advise would be appreciated.
 
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