BUKH 10 engine service,

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lancelot

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Hi folks,
I am looking for some hints on servicing a BUKH 10hp. diesel.
I have the service kit. I am not too concerned about the oil filter and change. However, I am not too sure about cleaning the secondary filter which separates the water and muck, in the glass bowl, Can these be cleaned and how? I think the smaller main engine filter is straight forward to change. Then there is the bleeding of the fuel system - any tips on this?
It was professionally serviced last year, but I want to do the servicing myself.
The boat is a Cobra 850
Cheers.
 
Saintclaire,

We have an 850, based in Cardiff. Where are you?

Never cleaned the glass filter, just changed it. Bleeding is not a problem. We had our engine rebuilt, and I had to bleed it then, and when we ran out of fuel after somebody forgot to turn the fuel on...........

On the secondary filter - at the engine, there is a small lever. Hard to see on ours, but we just slacken a nut on the filter and pump until diesel comes out. Starts fine then. When completely empty, it takes a minute or so. I wouldn't be scared to do it.
 
I've got a DV20 which is very similar...another important job is checking the Zinc anode inside the cooling circuit at 6 monthly intervals....
 
We are based in Swansea, but live in Bridgend. We have met via the Cobra site when you bought your boat.
The glass bowl filter can be replaced ?
I feel comfortable bleeding the secondary engine filter via the bleed screw. I am not too confident about bleeding the high pressure system (injectors)
Cheers
St, Claire
 
Hi,

The servicing is straight forward, and if you are reasonably mechanically minded will cause you no problem.

Diesels are reasonably straight forward.

The Primary filter is what I call the glass bowl. Look at it closely, with a torch. If there is no water in the bottom, you might leave it for a year. But do change it every couple of years, unless of course you know you have the diesel bug, or have filled up somewhere that might be a low volume fuel outlet.

The bowl usually has a drain, to get rid of water. Removal can be messy, have a plastic bag wrapped around it as you take the bowl off. Change filter and re-assemble. Switch off and fuel appropriately. Though many diesel system suck the fuel from the tank so you won't get a fuel flow anyway.

As you say, oil change oil filter change, secondary fuel filter change, hopefully you have a screw on filter, rather than a cartridge.

Bleeding is not difficult. On top of the secondary filter there should be a bleed screw. Open this a few turns, and crank the engine by hand until fuel starts to flow from the screw. tighten up.

That should have got rid of the air! If air is still in the system, you will tell if the engine won't start, just loosen the fuel pipe before the injector. Again hand crank the engine until fuel spits out. Reconnect and tighten the nut up hard.

Engine should now start OK!

Other jobs include chaging the water impeller, you should be OK changing it every other year, but do check it to see its whole. There was a batch a few years ago that was faulty, and they broke up! Take air filter off and clean. You may have a cardboard filter, but probably just crumpled steel wire. Alternator belt needs a check for tightness and wear. Have a spare, easy to meassure and buy from Halfords or similar.

Then just a general look over the beast, check water hoses and clips. Check for any oil leaks etc, and generally check for loose bolts.

Easy! Read this then go and employ a mechanic who will do it in a tenth of the time!!!

Just joking, you ought to be competent to do this sort of work on the engine so if the beast cuts out at sea, you will have a resonable chance in getting back to life.

Good luck
 
Cheers, Mark.
Thanks for the info. you make it sound so easy.
I note you are based in Swansea too. I am in phase 2 on K.
Perhaps we can catch up in the club, one night.
Regards
Keith
St. Claire
 
Cheers Spike,
I have a new zinc anode to fit if I need it. I just need to locate it. I believe it is under the exhaust elbow somewhere.
Regards,
Keith.
 
That's right there's a large bolt in the engine block below the elbow that the anode screws into. I would have a look at it sooner rather than later to determine how much anode you have left.....
 
Hi Mark,
I was in the club Sat. evening 7pm. until 11pm. I asked John and Helen to let me know if you came in.
I will try to catch you next time.
Keith.
 
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