mibix Posted March 23, 2014 Report Share Posted March 23, 2014 Hello. I had my engine on today charging up the batteries, and it started chugging. I noticed it wasn't pumping any water out! I have a feeling that some weeds have gotten their way into the system and wanted to ask a quick couple of questions. is this the stop cock and water pump? Do I just turn the knob anti-clockwise to close it? If I turn it the wrong way and disconnect the pump, do I have time to turn it the other way before my boat sinks? Do I then remove the pump and have a look if there is any blockages or a damaged impeller? Sorry for all the questions, don't want to end up sinking her! Link to comment Share on other sites More sharing options...
Tony Brooks Posted March 23, 2014 Report Share Posted March 23, 2014 It is the stop (sea) cock but I think the bit on top is a weed stainer. The raw water pump is normally engine driven. Occasionally by a belt (BMC 1.5 - some) or more usually a brass pump mounted directly on the engine. Any loose connection or air leak between the sea inlet and pump will reduce or stop water flow, as will a damaged impeller in the pump or a worn pump. It looks like a grp hull and if so usually the raw water pump is above the water line so can be dismantled without turning the seacock off. The seacock turns off just like any other gate valve but I can not remember which way. Someone else will be along soon to tell you. Has anyone turned it off for wintering afloat? There are rarer things like a blockage in the exhaust or bits of muck/impeller wings caught in hoses or heat exchanger cores that can cause loss of raw water but make sure the cock is turned on and check the suction side and pump before worrying about anything else. Link to comment Share on other sites More sharing options...
Flyboy Posted March 23, 2014 Report Share Posted March 23, 2014 Hello. I had my engine on today charging up the batteries, and it started chugging. I noticed it wasn't pumping any water out! I have a feeling that some weeds have gotten their way into the system and wanted to ask a quick couple of questions. is this the stop cock and water pump? Do I just turn the knob anti-clockwise to close it? If I turn it the wrong way and disconnect the pump, do I have time to turn it the other way before my boat sinks? Do I then remove the pump and have a look if there is any blockages or a damaged impeller? Sorry for all the questions, don't want to end up sinking her! It would be normal to turn the valve clockwise to close it, the same as a tap. Link to comment Share on other sites More sharing options...
mibix Posted March 23, 2014 Author Report Share Posted March 23, 2014 Great thanks. The water pump looks to be belt driven. A pipe comes from this weed strainer to the engine pump. If weeds are stuck in the strainer, can that stop the flow? Is it worth checking this before dismantling the water pump? I noticed the water pump does drip when the engines running. It wasn't winterised. We lived aboard it over winter, so the stop cock is open. It sounds like it's trying to pump water but nothing is coming out. Link to comment Share on other sites More sharing options...
Puddlejumper Posted March 23, 2014 Report Share Posted March 23, 2014 (edited) If the water flow has stopped and the engine was running for more than a few Min's the pump impeller is probably goosed as well better to check any signs of cracks slink it and fit new. Stop cock clockwise to shut anti clockwise to open then turn back a 1/4 turn stops it seizing up better still when next out on dry land fit a ball valve instead saves having the gate seizing if left in one position for along time the can on top of the tap is a weed trap edit If the impeller has any broken vanes make certain to remove them from the pipework as they can get in them in extreme cases Edited March 23, 2014 by Puddlejumper Link to comment Share on other sites More sharing options...
mibix Posted March 23, 2014 Author Report Share Posted March 23, 2014 Thanks puddlejumper. It's getting too dark to do anything tonight, but getting to the impeller involves removing the pump and dismantling? And take the old impeller to a shop to show and get a new one (and gaskets)? Link to comment Share on other sites More sharing options...
Naughty Cal Posted March 23, 2014 Report Share Posted March 23, 2014 It would be normal to turn the valve clockwise to close it, the same as a tap. Not always! Some of ours turn clockwise, some the other way! We were told that if it's facing the same way as the outlet pipe it's open if it's at 90 degrees I e barring the flow it's shut. Which is simple enough. If you are struggling with raw water flow check the impellor. 99.9% of the time that's what is wrong with ours. Link to comment Share on other sites More sharing options...
Puddlejumper Posted March 23, 2014 Report Share Posted March 23, 2014 Thanks puddlejumper. It's getting too dark to do anything tonight, but getting to the impeller involves removing the pump and dismantling? And take the old impeller to a shop to show and get a new one (and gaskets)? I would personaly get 2 kits so you have spare onboard when out and about ( Sods Law states if its goin to go again you will be miles away and stuck) Not always! Some of ours turn clockwise, some the other way! We were told that if it's facing the same way as the outlet pipe it's open if it's at 90 degrees I e barring the flow it's shut. Which is simple enough. If you are struggling with raw water flow check the impellor. 99.9% of the time that's what is wrong with ours. NC sounds like you have ball valves on your boat Link to comment Share on other sites More sharing options...
Naughty Cal Posted March 23, 2014 Report Share Posted March 23, 2014 Not sure but when we had to take the raw water pump off to replace the seals we left her afloat via a Tesco plastic bag! Probably not a great idea. Had the bag dislodged she would have made her way to the bottom of the lake! Link to comment Share on other sites More sharing options...
BEngo Posted March 23, 2014 Report Share Posted March 23, 2014 If its a jabsco type pump take out the 4 or 6 small screws that hold the front plate of the pump on and remove the plate. you can then pull the impeller out with a pair of long-nosed pliers. If it's missing any vanes you need to find them before they cause a problem. The important numbers which describe the pump are on the front plate and that is what you need to take to the shop ( jabsco/ITT have an excellent on-line shop IME) and ask for a new impeller for one of these please. If the impeller is well banjaxed there won't be any vanmes so the shop will have little to compare it with. Since the pump drips you will also need a new gasket for the front plate and probably the rear seal if it's dripping at the back. Dismantling is pretty self evident. When refitting twist the impeller into the hole in the direction of rotation ( shown on the front plate) NC- OP has a gate valve, not a ball valve like yours. Gate valves are like a tap, usually. N Link to comment Share on other sites More sharing options...
Phil Ambrose Posted March 23, 2014 Report Share Posted March 23, 2014 I would first check the weed filter and if possible the strum box, I once had a small Perch in my weed filter and I have known people who have had fresh water Mussels growing inside! If all is clear proceed as above posts. Phil Link to comment Share on other sites More sharing options...
Brin Morris Posted March 23, 2014 Report Share Posted March 23, 2014 I had a similar set up on my first boat. when I had the problem of low water flow I checked the weed filter and it looked clear so I removed the impeller and it was ok. The cause was a bag was partially blocking the inlet at bottom of boat. I would check weed filter if that is clear leave filter out and open the sea cock to make sure you have a good flow(open it slowley and you can close it in plenty of time before boat would sink). If you have a good flow go to impeller. If you do not have a good flow I used to rod out from filter to bottom of boat with a bottle cleaning brush. You have to be quick and ready to close off the tap when the blockage clears. Link to comment Share on other sites More sharing options...
mibix Posted March 26, 2014 Author Report Share Posted March 26, 2014 Hi guys, I've decided to buy a new impeller and gasket etc. for the pump. Before pulling it apart, I tried to ID it, but there are no markings on it. Is it just the stock one that came with the engine? The engine is a Yanmar YSE12L. Is that what I need to look for? Link to comment Share on other sites More sharing options...
Naughty Cal Posted March 26, 2014 Report Share Posted March 26, 2014 It all looks a bit wet in there!! Link to comment Share on other sites More sharing options...
mibix Posted March 26, 2014 Author Report Share Posted March 26, 2014 Yeah it's a bit soggy - the water pump leaks when running, and the bilge pump has decided to konk out. Hopefully a new gasket for the pump will stop the leak. Link to comment Share on other sites More sharing options...
Naughty Cal Posted March 26, 2014 Report Share Posted March 26, 2014 Yeah it's a bit soggy - the water pump leaks when running, and the bilge pump has decided to konk out. Hopefully a new gasket for the pump will stop the leak. You might find it needs a new seal kit. Thats what we had to replace on ours. Not a difficult job, on the VP pump anyway. Link to comment Share on other sites More sharing options...
mibix Posted March 26, 2014 Author Report Share Posted March 26, 2014 You might find it needs a new seal kit. Thats what we had to replace on ours. Not a difficult job, on the VP pump anyway. Cool I'll have a scout around the internet see if I can get a whole new everything for it! Link to comment Share on other sites More sharing options...
OldGoat Posted March 26, 2014 Report Share Posted March 26, 2014 Hi guys, I've decided to buy a new impeller and gasket etc. for the pump. Before pulling it apart, I tried to ID it, but there are no markings on it. Is it just the stock one that came with the engine? The engine is a Yanmar YSE12L. Is that what I need to look for? Something about the shape of the pump makes me think it could be a Jabsco?? They do make quite a number of pumps and were (?) leader until Johnson came along. There aren't than many manufacturers.... Jabsco illustrated spares here:- http://www.jabscoshop.com/marine/pumps/bronze-engine-cooling-pumps/ Link to comment Share on other sites More sharing options...
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