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TOPIC: Please, help resolve a problem

Please, help resolve a problem 23 Feb 2009 22:17 #1

  • Bayliner2550
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Hi everyone,
Recently I've bought Bayliner Sierra 2550 Designer Edition boat, 1985. I have Volvo Penta engine 260 H.P. and same kind outdrive on it. Maybe you can suggest me, what can be a problem that I can't resolve by myself. Outdrive prop is 15/17. When I accelerate a boat it wan't plane. It just pushing a water. The speed is 8-10 MPH at 3000 RPM. Yesturday, I fixed my prop to 15/16 in a shop and i was able to run 21 MPH at 3750 RPM, but in 20-30 minutes of ride, when I made a U-turn, I had the same problem-8-10 MPH. The engine is not running hot, 140 degrees. At WOT the engine does not make more, then 3100 RPM again.
Can you help me with my problem?
Thank you.

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Please, help resolve a problem 23 Feb 2009 22:34 #2

  • Chass
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My neighbor has a similar problem with his older Nisqually. It just doesn't seem to want to get on plane. I checked his timing and it was WAY advanced so I adjusted it. That helped a little but its still not coming out of the water. I suspect his engine is tired or there is something wrong with his carb.

I also noted that his boat has been FULL of water before. He left it sitting when it snowed with the drain plug in and it filled up with water to the top of his oil pan. I think the foam in his older boat may be completely saturated with water. It might just be too heavy for the older engine to get it on to plane.

Chass
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Please, help resolve a problem 23 Feb 2009 22:50 #3

  • greaser140
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Hi, I had a princess 25 with a 5.7 volvo with a volvo duo z drive and had the same problem it wouldnt get past 16 mph are you sure your engine is 260 hp because usually they're 220 hp it might be its just a bit too heavy to plane other than a good service I don't know what to suggest. cheers Bri.

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Please, help resolve a problem 24 Feb 2009 13:44 #4

  • Boatman
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It might be a spun hub on your prop
Take it to a prop shop have them test it

Mike H

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Please, help resolve a problem 24 Feb 2009 13:51 #5

  • dmcb
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The rpms you show at wot when you reach 21 mph is just to slow.
When you turned you likely went into a different wave action and being marginal, you couldn't get on plane.
First be sure your engine is tuned properly.
Then be sure your bottom is clean. That means no growth of any kind. That will make a huge difference.
Now you are ready to adjust prop pitch.
Each 1 inch of pitch (or dia.) will result in a change of about 200 rpms. Your goal is about 4400 rpms at wot.
Anything much less than that will damage your engine as it will be lugging.
Also look at additional weight you may be carrying. You may be marginal on that boat for performance.
Each of the things I mentioned is critical to a good performing boat.
Doug

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Started boating 1955
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Please, help resolve a problem 24 Feb 2009 14:39 #6

  • NYBo
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The puzzling part is having the boat plane albeit with too low RPMs at WOT for part of the trip then having the problem the rest of the way. Is it possible you're taking on water, have a failed bilge pump, and then having the water weight take its toll after you come off plane to make the u-turn? Just a WAG, of course....

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Please, help resolve a problem 24 Feb 2009 14:41 #7

  • Download_Complete
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Since we have no idea whats wrong and even less information to go on, here is what I suggest. Lets first make sure the engine is healthy.

1. Full tuneup, and I mean EVERYTHING. Change fuel filter, test fuel pressure from the pump.
2. Fluids change, engine oil AND drive oil. Pull the boat and change the oil in the drive, and pressure test the drive. Pressure wash the hull at this point and make sure its clean.
3. Compression test the engine. Compression should be about 120 all the way across.
4. Re-time the engine per the manual.
5. Carb cleanout.

Splash the boat again. Your max RPM should be 4100 - 4400 RPM at wide open, so prop accordingly.

At this point if the boat passed all this and you have done the work, you have a solid baseline to work from. If you don't do this, you're just taking guesses.

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Matt Train
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Chicagoland, IL

Please, help resolve a problem 22 Jun 2009 16:08 #8

  • reinahd
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I could realyl sue some help on this one. the folding door and cover hatch need to be replaced.

Any ideas?

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Please, help resolve a problem 22 Jun 2009 16:28 #9

  • mainecoast
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You could try starting a new thread as this one has nothing to do with a cabin door.

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[SIGPIC] [/SIGPIC]
1989 2650...an ongoing restoration...but I'm totally clueless...It just happened to be running the day this photo was taken.
Isn't owning a boat always an ongoing restoration?
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