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Old 21-05-2013, 02:50   #1
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Location: Cork Harbour, Ireland
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Beta 33hp engine

I have a 33 HP beta marine engine ( marinised Kobots engine) always hard to start from day one...I have had two good diesel mechanics check it out and we have identified that the fuel pump is delivering a small amount of fuel and that the problem is a fuel one.
The plan is to remove the fuel pump and have it set up and bench tested
I have a Kobots series 5 engine manual but it is not great on detail there any other manuals for this engine you know off?? and any comments on the problem

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Old 22-05-2013, 12:10   #2
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Re: Beta 33hp engine

It sounds like you have a fuel supply problem but without some more information, I really cant help.
How far is the fuel tank from the engine?
Is the tank below the engine?
How is the return line run?

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Old 22-05-2013, 15:07   #3
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Re: Beta 33hp engine

Believe it's spelled Kubota, btw. If you have no throttle response and speed increases, it would seem the first two cylinders aren't firing and the 3rd cylinder is sucking lube oil to burn. Not good indications. Pull the injectors and see if you are getting fuel to the cylinders. Do a compression check while the injectors are out. Probably going to mean hauling the engine out and replacing rings in at least one cylinder. other cylinders could be stuck valves which you should be able to determine after pulling the valve cover(s). Good luck.
Peter O.
'Ae'a Pearson 35
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Old 22-05-2013, 15:55   #4
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Location: Home port is San Diego, California but currently cruising the Caribbean.
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Re: Beta 33hp engine

I had the exact same problem with my Beta 90. Ultimately, I installed an electric fuel pump and also made certain that the fuel return line had a significant loop that rose above the injection pump. Also, we recently had the manual pump that's fixed to the final fuel filter fail. Right now we're running without the final fuel filter - certainly not recommended but we have a big Racor 2-micron filter just upstream.

Good luck, fair winds and calm seas.
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