Bukh DV10 throttle quadrant

EASLOOP

EASLOOP

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Good afternoon everyone.
Can anyone tell me what the throttle quadrant is for? and how to adjust it?

When fully screwed in the throttle adjustment bolt on the quadrant doesn't even touch the end of the teleflex cable!? Result is that I cannot increase the idle speed; on tick over the engine sounds like someone is thumping a lump of metal with a rubber mallet, sort of dong - dong - dong etc. It seems that maybe the entire quadrant needs to be turned - but I don't want to muck anything up.

The problem I am ultimately trying to solve is that when I put the throttle partly ahead the RPM just increases and increases requiring me to throtlle backwards and frontwards a little until I get the right speed - bit of a fiddle really; same going astern.

If anyone can offer some advice I would be pleased to hear from you.

Thanks as always.
 
My DV10 also goes dong dong dong and I was told by the marine engineer that was what it would be like for a 1972 single cylinder! As to the idling speed wait for Cliff or phone BUKH UK. 01202 668840
 
nice description: my DV10 makes the same sound. Last year when I brought the boat I replaced the piston which was badly pitted, honed the cylinder liner and had the cylinder head serviced (valves recut and lapped into new valve seats. Always starts first time and gives me no trouble, so I've always assumed that a healthy DV10 is supposed to sound like that.
 
Yes, now thinking about it my engine is totally not sound proofed. I have stripped out the hull for re-building of the furniture. One of my colleagues at our boat club has a really sweet sounding DV10 but of course his is wrappred up in sound proofing.
 
Idle speed 900~1200 rpm.

Adjusted by using the stops on the quadrant - you might need to move the arm on the govenor shaft.

Disconnect the teleflex cable, start engine and manually move the arm to achieve correct idle speed, adjust stop bolt to contact the arm or if noot possible slacken the arm pinch bolt and move the arm to correct position, tighten the pinch bolt to 6.5~7.23 ft.lbf (0.9~1.0 kgmf).

The govenor shaft should not turn while repositioning the arm as there are spring disc washers fitted below the cover plate to create some "stiffeness" in the shaft howeve there is a slot cut in the top of the shaft into which you can put a large flat blade screw driver if needed.

For further information refer to section G of the workshop manual.

As for the noise - they all go "dong, dong, dong, dong or donk, donk, donk, donk" as would be expected from single cylinder marine diesel engine.

Check the engine mounts are not shot and fit some sound proofing.
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I think there is a further problem here, not just idle adjustment? If I read your post correctly, the engine continues to accelerate as soon as you move the throttle away from the idle position.

Does it accelerate to full engine speed (3150 RPM) and beyond? If so the centrifugal governor is malfunctioning. What is supposed to happen is that the centrifugal governor maintains a constant engine speed according to the throttle setting regardless of the load. i.e the throttle setting giving 1500rpm off load should acheive the same rpm with the gears engaged.

Unfortunately the centrifugal governor is housed inside the rear cover which has to come off to access it so probably an engine out and workshop job, unless you have an unusually accessible engine!

Try setting up the idle speed correctly first and see if that cures it. If the manual speed control is set badly adrift, then it may be unable to regulate the centrifugal governor properly.

You will almost certainly have to hold the governor shaft with a screw driver while setting up the throttle quadrant as Cliff describes, as the shaft nearly always does move with the quadrant unless it has been dismantled and cleaned up.
 
Thanks for yours and oldharry's input. That is exactly what I was looking for. I will make the adustments.
Oldharry: The revs do not skyrocket they just increase steadily to a much higher level than I would have expected given the control position. If I fiddle with the control i can establish a steady rev while under load. I will look more closely at that though just to make sure. Should be able to get on the boat during the week.

Thanks to everyone for your advice,
 
I told you Cliff would be along! Always helps me out as well. And if you don't have the manual I can email you the section. Cheers Cliff and how are you?
 
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