Bukh 10hp. Poss. Water Pump Leak?

[lancelot]

Hi.
I ran my engine today after a couple of months of rest. I noticed as it was running a speck of water being thrown out from behind the water impellar - not much, intermittently. After it had run for about an hour and a half there was a pool of water below in the engine bilge, again not much, about two kitchen towel tissues to soak it up. I have noticed some water in the bilge before, however, I have never noticed any water coming from behind the water impellar housing - this is not to say it was not leaking previously.
Would this be the water pump leaking?
If it is, would it be a gasket/ seal leaking?
If the pump has been leaking would there be any damage to the engine? There is no sign of water in the engine oil, if this is possible. Can the engine be run like this temporarily?
How big a job is it likely to be and what is entailed, since I have never had this problem before?
Would it be the far side of the water impellar leaking?
Fair winds,
Lancelot

 

[sailorman]

Hi.
I ran my engine today after a couple of months of rest. I noticed as it was running a speck of water being thrown out from behind the water impellar - not much, intermittently. After it had run for about an hour and a half there was a pool of water below in the engine bilge, again not much, about two kitchen towel tissues to soak it up. I have noticed some water in the bilge before, however, I have never noticed any water coming from behind the water impellar housing - this is not to say it was not leaking previously.
Would this be the water pump leaking?
If it is, would it be a gasket/ seal leaking?
If the pump has been leaking would there be any damage to the engine? There is no sign of water in the engine oil, if this is possible. Can the engine be run like this temporarily?
How big a job is it likely to be and what is entailed, since I have never had this problem before?
Would it be the far side of the water impellar leaking?
Fair winds,
Lancelot

replacing the seals is very straight forward, take photos as you strip it down.
you must get the new seals the correct way round.
Brammer or similar suppliers will have them & they must have s/s springs.
also check the spindle for wear @ the seal position
http://www.brammer.pl/uk/rotary_shaft_seals.aspx

 

[lancelot]

BUKH 10 hp. Water pump leak

Thanks Sailorman,
This will probably make me sound like a Noddy. Does this mean that the water impellar unit is the main water pump on the raw water cooled engine? Exactly where would the water be thrown from, I thought it looked to be from the block behind the impellar housing/water pump?
Fair winds,
Lancelot

 

[sailorman]

Thanks Sailorman,
This will probably make me sound like a Noddy. Does this mean that the water impellar unit is the main water pump on the raw water cooled engine? Exactly where would the water be thrown from, I thought it looked to be from the block behind the impellar housing/water pump?
Fair winds,
Lancelot

the spindle normally has 2 seals
1 behind the impeller
1 where the spindle exits the engine.
remove the pump from the engine
remove the impeller
the spindle should be able to be removed from the body by drawing towards the engine end of the body.
there is normally a gap in the body between the seals as a "Tell Tale" to allow water ( if leaking ) to drip out

 

[rhumlady]

Between the pump and the engine, where the shaft goes through, there are tell tale holes that let the water or oil drip out thus indicating a failed seal. When you have the pump stripped check the state of the shaft as if it is worn it will need changing as well or you won't get a good sael and the new seals will not last very long.

 

[Rafiki]

Your comment wrt the shaft needing to be repalced if worn is understood, but where do you buy them from? I cant seem to find anyone who sells them.

Regards

 

[sailorman]

Your comment wrt the shaft needing to be repalced if worn is understood, but where do you buy them from? I cant seem to find anyone who sells them.

Regards

is it a jabsco or Johnson pump

 

[Rafiki]

Johnson, I thought they were pretty well interchangeable in any case.

 

[lancelot]

Bukh 10hp. Poss. Water Pump Leak

Your comment wrt the shaft needing to be repalced if worn is understood, but where do you buy them from? I cant seem to find anyone who sells them.

Regards

Hi.
You could try BUKH Diesel UK. LTD. in Dorset tel. 01202 668840.
They are very helpful and will post same day.
Fair winds,
Lancelot

 

[Poignard]

Your comment wrt the shaft needing to be repalced if worn is understood, but where do you buy them from? I cant seem to find anyone who sells them.

Regards

http://www.asap-supplies.com/

 

[SimonJ]

Water pump seals

It is absolutely essential that you fix this quickly. It is a weakness of this engine (probably the only thing you must always look out for) that the two water pump seals fail and then water gets into the sump and the problem which was small becomes HUGE. You have spotted the leak through a 'telltale' hole - if you run the engine further and it warms up this indicator hole will fill with salt eventually and you may miss the sign of failure.

BUKH UK will supply all the bits and tell you how to do the job! They are extremely helpful.

 

[oldharry]

Bukh water pump. The seals labelled 9 on the diagram have failed. As has been pointed out, seawater can now enter the sump, and as soon as the drain hole is clogged with salt residue, it will!

Note that the seals face each other, which is why if the outer one fails (as it always does) the water very soon gets forced past the inner one

 

[lancelot]

Bukh 10hp Water Pump Leak

Thanks everyone and especially Simon J and Old Harry again.
I have been in touch with Bukh. and as always very helpful. They provided several ways of repairing the job - from just the bits that may need replacing to a new water pump. I will send the water pump away and they will recondition it, replacing all the bits that wear out. I have serviced the pump last year, however, did not realize the leak until now. I thought it wise to make a good job once and for all.
I had a look tonight in torch light to see how to take it off, fairly straight forward apart from the bolt between the pump housing and the edge of the flywheel - not a lot of room.
Has anyone developed a good method of taking the bolt out. Alternatively, is there a tool I could use, besides the obvious - spanners, sockets.
Any advice thankfully received.
Fair winds,
Lancelot

 

[karizma]

bukh DV10 thermostat

Hi, Would anyone know the thread size/pitch of the screw in hose stubs on the thermostat housing on Bukh DV engines? I'm in the throws of recommisioning the Bukh in my boat and noticed one of the stubs is missing! Foolishly I did not remove the other one to use as a pattern. I am scheduled to have a trip down From Bath where I live, to Plymouth where the boat is to carry on tinkering, and not being able to run the engine for long due to the lack of this miserable part is a major annoyance!!! Hope someone can shed some light on the thread size or indeed where I might source one, and hopefully save my project from yet another hold up! Many thanks.