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Go Back   SailNet Community > On Board > Gear & Maintenance > Bukh engines
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Thread: Bukh engines Reply to Thread
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Topic Review (Newest First)
03-14-2011 12:49 AM
sctpc Thanks Guys That would be it I dident check the prop or bottom this week as in two weeks im anti fowling it, and I haven't used it for 3 week ether.
03-13-2011 11:57 PM
mitiempo If the prop and bottom are clean suspect the exhaust elbow. The exhaust is as important as the intake and if restricted by carbon build-up, which is common, the engine will do exactly as yours does.
03-13-2011 11:18 PM
haffiman37 Check that your prop and boat bottom is clean!
Most likely unburnt fuel due to overloaded engine.
03-13-2011 11:07 PM
sctpc I know this is an old Thread but Im very concerned,
I have a Bukh 10hp and yesterday I got caught in a squall on port Phillip bay and tried to run her at 2700rpm and could only get 2200rpm and oil, fuel was coming out the exhaust, its like she has no power. Starts fine, idles but puts out black stuff and I cant get up the revs. suggested adjusting stop solenoid what do you guys recon is it a major problem and should I get a mechanic to look $$$ or be tight and run it till something happens!!! I do prefer option 1 but would like to have an idea first.
01-21-2008 01:12 PM
Rockter It's the long-serving Kubota motor.
They have been around a while, so there will be plenty of bits around for them that were used for fork-lifts, generators, and so on.
This is so important in the long term, as the engine supplier cannot charge too much for the parts, as others, Volvo being the worst for me, try to.
If Betamarine try that one on, just find the bit that's broken from a fork-lift supplier, or similar.
The exception will be the marinesed bits, but do they fail often? I wonder.
01-20-2008 02:23 PM
JohnRPollard GBURTON,

Good call. Is that the BV1505? That's a fairly large engine, but it will be nice having 4 cylinders pushing that Westsail. I think you made the right decision, all things considered.

I like what I've learned so far about them while studying these Beta engines. I'd be interested to hear installation and performance reports when you have them.
01-20-2008 02:00 PM
Rockter The Kubota-based Betamarine.
Should be a good unit.
They cannot rip you off for parts like Volvo try to.
01-20-2008 12:02 AM
GBurton I sold the Bukh and bought a Betamarine 39 hp. It is very pretty
11-01-2007 06:57 AM
haffiman37 In this application torque, as in most sailboats, will be the main issue One thing is engine torque, another and most important is prop-shaft torque, in other words gearbox ratio and what prop it may handle.
The DV24 has a torque of about 55Nm in rpm range 1800-2400 and is delivered with either 2,5 or 3:1 gear box. That will give roughly 137,5 - 165 on the shaft.
If we compare to Yanmar 3YM20 and 3YM30 the figures will be:
3YM20 (21hp) 51Nm in range 2000 - 2600. Gearboxes:2.21,2,62,3,22:1.
121,5 -133,62 - 164.22Nm on prop shaft.
3YM30 (29Hp) 70Nm 2000 - 2500rpm, same gearboxes as above.
154,7 -183,40 - 225,4Nm.
My answer in this case would be if the attaced gearbox is 3:1, install it, You will probably have enough torqe and 'power'.
I have a 3GM Yanmar with a 2.62 gearbox, cruising wheight of 8000 kg (16000lbs) and run a 3-blade Flex-O-Fold prop. Top speed 7knots+, cruising 5kn at 2000rpm, in a Jeanneau SO37 -2002.
11-01-2007 05:23 AM
Rockter My own ship is a 23,000 lb double-ender with a long keel. A 35 hp motor moves it well with a two blade prop. It's a heavy motor, close to 780 lb.
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