Beta Marine 20hp - stuck in full throttle, unable to shut off the engine.

[milen777]

Hi,
I have Beta Marine 20hp, fuel pump was not working properly so i bought brand new one.
after replacing the engine finally started but runs only in full throttle and i am unable to put it to idle or to stop it with the stop button unless i shut the fuel supply.

i opened the pump and throttle box but do not see anything unusual.
the stop leveler is moving nicely so is the throttle, i can not work how the throttle is working as it is not connected to the pump, it is just moving left and right with one spring

Make no sense to me.

does anyone had similar issue,
how to bring the engine to idle.
Picture bellow is the throttle box on the right and pump bed on the left. only the stop line is attached to the pump vie the little gap.
at the back there is the throttle with only one spring but is not attached at all.



the back is the sprint with the throttle


any help will be appreciated




thank you
Milen

 

[Malish]

Hi
Beta Marine are reputedly quite a friendly bunch... have you approached them direct? what did they say? (and where are you)

 

[colinb11]

The Beta 20 is a Kubota D722 at heart, have you seen this video where the governor assembly is put back on a 722

Kubota D722 Diesel Internal Throttle/Governor Springs Install - YouTube

 

[Cobra]

Second that for Beta Marine. Have a Beta 20 in our current boat and had a Beta 20 in a previous one. Both engines have been very reliable. We are very fortunate in having a Beta Marine Dealer in Brightlingsea who is extremely helpful, DB Marine Engineering Tel: 01206 304 391

 

[PetiteFleur]

Speak directly with Beta Marine, they are excellent - have the Works Order number available and they'll sort you out.

 

[BabaYaga]

the stop leveler is moving nicely so is the throttle, i can not work how the throttle is working as it is not connected to the pump, it is just moving left and right with one spring

Make no sense to me.
- - -
Picture bellow is the throttle box on the right and pump bed on the left. only the stop line is attached to the pump vie the little gap.
at the back there is the throttle with only one spring but is not attached at all.

I have the same engine (Beta 722), but don't pretend to have any knowledge on how these things work.
However, it seems to me that if there is indeed only one moving part within the engine (the larger sliding thing with the slot) that attaches to something within the fuel pump, then this thing must cater for both throttle changes and fuel shut off.
So my guess would be that the throttle is interconnected to the 'sliding thing with the slot' in some manner.
Would be interesting to know about the outcome of this problem.

 

[milen777]

Hi thank you all
the throttle body is connected properly with 2 springs an both are moving,
it is only one connection to the pump, and is what look like the "Stop" little shaft.
i will contact Beta Marine and post the results later on here.

Many thanks.

 

[Topcat47]

I'm not familiar with the Beta Range but it sounds like a Governor problem to me. It's probably not correctly attached to the rack.

 

[Bilgediver]

Hi,
I have Beta Marine 20hp, fuel pump was not working properly so i bought brand new one.
after replacing the engine finally started but runs only in full throttle and i am unable to put it to idle or to stop it with the stop button unless i shut the fuel supply.

i opened the pump and throttle box but do not see anything unusual.
the stop leveler is moving nicely so is the throttle, i can not work how the throttle is working as it is not connected to the pump, it is just moving left and right with one spring

Make no sense to me.

does anyone had similar issue,
how to bring the engine to idle.
Picture bellow is the throttle box on the right and pump bed on the left. only the stop line is attached to the pump vie the little gap.
at the back there is the throttle with only one spring but is not attached at all.

View attachment 130083

the back is the sprint with the throttle
View attachment 130084

any help will be appreciated




thank you
Milen

The lever in the second picture with the notch in it is the lever that engages with the pin on the fuel pump rack. Although it does not seem possible to do it , If you put the pump back into position without the pin on the fuel pump rack engaging in that slot but sitting to the left of the slotted section then exactly what you describe will happen as the pump rack will be pushed to full speed and then left in that position.

Can you position the slot directly under the slot in the casting to ensure the pin engages correctly as the pump is lowered into place. That lever should move full travel when the throttle is moved from slow to full and back to slow. If it does not then there is an issue with the governor. It must be moving to full speed at some point to push the fuel rack to full speed however does it return to slow with the movement of the throttle?

 

[penfold]

Do these pumps have shims like Bukh pumps do? The shimming creates weird problems if it's not right.

 

[milen777]

Hi many

The lever in the second picture with the notch in it is the lever that engages with the pin on the fuel pump rack. Although it does not seem possible to do it , If you put the pump back into position without the pin on the fuel pump rack engaging in that slot but sitting to the left of the slotted section then exactly what you describe will happen as the pump rack will be pushed to full speed and then left in that position.

Can you position the slot directly under the slot in the casting to ensure the pin engages correctly as the pump is lowered into place. That lever should move full travel when the throttle is moved from slow to full and back to slow. If it does not then there is an issue with the governor. It must be moving to full speed at some point to push the fuel rack to full speed however does it return to slow with the movement of the throttle?

Hi many thanks for the help i will try put it so the pin at the back of the pump fits exatly and try it, however the pin and the front lever is conected only to the stop swich, the throttle is the second one that is at the back and is not conected to the pump. It is just hooked with a spring. I will try again put it properly.
Also what is governor
Many thanks

 

[milen777]

Hi many

Hi many thanks for the help i will try put it so the pin at the back of the pump fits exatly and try it, however the pin and the front lever is conected only to the stop swich, the throttle is the second one that is at the back and is not conected to the pump. It is just hooked with a spring. I will try again put it properly.
Also what is governor
Many thanks

What i meen is the throttle lever does not move the pin on the pump. Only the stop lever moves the pin.
Throttle is just connected to a spring not to the pump

 

[Bilgediver]

Also what is governor
Many thanks

When we drive a car or boat with a petrol engine the throttle pedal is in direct control of the engine by adjusting the carburetter . Keep your foot hard down and the engine will race away either to destruction or on more modern cars till an electronic overspeed cuts the ignition .

When a diesel engine is fitted on a boat or car we do not have this direct control using the throttle . There is a governor fiitted to the engine and the accelerator tells the governor how fast we want to go and if you leave the throttle setting fixed then the engine speed will remain almost constant no matter wether going uphill or down hill in a car or into the seas and with the seas in a boat. The springs you see are part of the governor assembly.

When the engine is stopped and you put the throttle to half speed the governor will actually put the fuel pump to almost full speed. However as soon as the engine starts the governor will take control and hold the engine at half speed. There are springs involved in these governor speed assemblies in these small boat engines and sometimes one of these fails . This will possibly be the cause of your problem if the fuel pump rack is correctly engaged with governor anbd the problem persists.

The arrangement of the governor to fuel pump rack connection looks like it is almost impossible to make a bad connection but worth making sure. This is frequently the cause of such a problem on Volvo and other diesels where unfortunately it is easy to assemble with no connection between the pump rack and governor.

Please note that the speed control lever on the engine has two adjustable stops . Make sure when you are sorted that these are correctly adjusted. One sets the tickover and the other sets maximum speed. Thsese are adjusted with the gear box in neutral.

 

[milen777]

hi,
thank you all for helping.
the problem is now fixed and the engine is going well on idle and i am able to stop it properly...
what looks like most probably the back pin on the pump was not fit properly to the little shaft.
i put everything back together and is working very well now.

thank you again.

 

[rotrax]

Give yourself a pat on the back - well done!

 

[Bilgediver]

hi,
thank you all for helping.
the problem is now fixed and the engine is going well on idle and i am able to stop it properly...
what looks like most probably the back pin on the pump was not fit properly to the little shaft.
i put everything back together and is working very well now.

thank you again.

Well done.. On some engines it can sometimes be quite difficult to get that pin into the governor arm. Especially if you can not get a good view of what you are doing.