MD6A Problems - Water Gushing from Air Intake ???

  • Thread starter Thread starter JordanBoon
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Nearly There

Hi there i have now emptied oil and finally got rid of the milky oil, i am now having problems with my water intake that it is not sucking up water, I have it attached to a bucket and it just wont suck, I have a new impeller and have blown through and there are no air bloackages, What to do next
 
You may need to prime the pump .. (easier said than done) but it sounds as though your pump may not be it the best of health

What I have done is sat the bucket in the cockpit with a hose running into it and surplus running away via the cockpit drains.

I then put the suction hose into the bucket. It does not then have to lift the water other than just over the rim of the bucket.

It will of course tend to keep syphoning when the engine stops so it is important to pull the hose out of the bucket at the same time as stopping the engine, or before.

Take care the hose does not come in contact with the flywheel or other moving parts.
 
JordanBoon said:
Hi there i have now emptied oil and finally got rid of the milky oil, i am now having problems with my water intake that it is not sucking up water, I have it attached to a bucket and it just wont suck, I have a new impeller and have blown through and there are no air bloackages, What to do next
Click to expand...

You need to prime it, often happens if the pump face plate is worn. If you have a large, Vetus-type strainer before the pump fill this with water , fill to the brim and put the lid on with the O-ring greased. If you don't, put the bucket in the cockpit above the height of the engine, siphon water out of it with a hose and when the hose is flowing put it onto the inlet of the pump. That will get it going but without any risk of flooding the engine. Keep filling the bucket with a hose pipe.
 
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I have blown the line all the way from where the water goes into the exhaust and it blows through fine. I then thought i would suck water through which i did and was fine, although when i turn on the engine it does not suck the water up...
This is now getting irratating...
 
JordanBoon said:
I have blown the line all the way from where the water goes into the exhaust and it blows through fine. I then thought i would suck water through which i did and was fine, although when i turn on the engine it does not suck the water up...
This is now getting irratating...
Click to expand...

You 'might' find, if you remove the impeller, that the central shaft has de-bonded from the outside annular rubber ring with the fins.....

Or the shaft's loose key has dropped out, and the shaft is turning but not the impeller.

:cool:
 
JordanBoon said:
I have blown the line all the way from where the water goes into the exhaust and it blows through fine. I then thought i would suck water through which i did and was fine, although when i turn on the engine it does not suck the water up...
This is now getting irratating...
Click to expand...

It can be.....If the impeller is not loose and the pump does not pick up suction even when well coated with vaseline, did you remove the pump at any point and is there a chance you put it back the wrong way round????? In this case it will be sucking from the engine and blowing to the bucket. It is sometimes possible to do this.
 
Ill add a load more vaceline to the impeller. However i have the water in a bucket and it does not blow air out. When i have the impeller open and turn the fly wheel it all turns.
 
Not sure how far you have progressed but the gearbox should be OK as they are seperate units.If oil looks OK just leave it. The compression issue is either because the de-compression lever is open or you have a problem with stuck valves.

Yoda
 
JordanBoon said:
Ill add a load more vaceline to the impeller. However i have the water in a bucket and it does not blow air out. When i have the impeller open and turn the fly wheel it all turns.
Click to expand...

It sounds like the water passage through the engine is OK, particularly as the hose pipe seems to have proved it. Suggest you concentrate on the pump for now. Disconnect the outlet hose so there is no risk of any flooding. Take another hose from there back to the bucket. Prime the pump and turn the engine over on the starter motor, or you could run the engine very briefly to get some speed on the pump. Don't do this for more than about ten seconds or you will burn the exhaust. You should then be able to see that water is being delivered by the pump. If not there is something unusual wrong with it.
 
And don't overlook bilgediver's comments about the possibility of having put the pump back on wrongly if you have had it off.
I cannot see any useful diagrams or pictures anywhere and it may be difficult or impossible to fit it wrongly but it's a valid point.
 
OK, it's a new impeller, it turns when the crankshaft turns, there's vaseline around it, and it's possible to suck water through the system. Doesn't leave much else. How about checking the condition of the cam in the pump? (This is a little "new moon" shaped casting held in by a single screw on the top of the pump).
 
The only thing that could be on in the wrong place is the gear box, when fitting it we realised it could go on any way we wanted it to. However this would not work as the gear box oil can only be at the top.
Ill check this new moon shape and get back to you
 
Boat out and About and Over Heater

Hi there just a quick question to see if anyone knows if the MD6A or 7A has a cut of switch. I took the boat out for the first time yesterday and the engine cut out with lots of smoke etc due to the water pipe coming lose and not pushing water around the engine, when we were returning from West Witerick.
We managed to sail back to the harbour and when we got back the engine did fire up.
Is the engine knakered/
Has anyone got any ideas of what i should do to prevent this in the future other than not pushing the engine too much.
and what is the best coase of action to make sure there is no lasting damage

Thanks Jordan
 
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