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Post by Deleted on Sept 15, 2018 10:30:19 GMT
My Perkins p4 has a 12v 38mm cooling pump. The magnets came unstuck and stuck to the armature and its burnt up. Well it blew a fuse and I took it apart restuck the magnets and tried it without fuse it burned.
Anyway its an expensive pump and the head is fine. For now I have coupled an old shurflo motor to the armature shaft with gas hose and jubilee clips.
Does the job but ideally I'd prefer to replace the motor as a new pump is about £250 !!! Far too much.
I'll get a photo of the pump later on. Unfortunately the shurflo pump motor won't mate to it and I'm not sure shurflo are rated for continuous duty.
Either that or is there some vehicle part with 38mm hoses.
I'm a bit allergic to the £250 but I suppose with a life of 2500 hours it isn't that expensive.
It'd be a Johnson C090 pump I believe. The one on there is probably 22 years old and may have indeed done the 2500 hours as it is always on when engine is running (fairly low hours engine).
Its quite a good arrangement because it means you can lose the alternator belt but retain cooling as the pump does not rely directly on the belt and only draws about 6amp.
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Post by naughtyfox on Sept 15, 2018 10:36:23 GMT
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Post by Deleted on Sept 15, 2018 11:22:42 GMT
Yes that would be the replacement but its a previous version. What I'd like to do is find a motor that fits it. The end of the motor shaft is internally theaded so the pump impeller is held on by a little torx screw and probably driven by a D shaped end although I have not taken it that far apart.
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Post by bargemast on Sept 15, 2018 17:01:03 GMT
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Post by naughtyfox on Sept 15, 2018 18:13:20 GMT
Don't click on the link !!!
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Post by Deleted on Sept 15, 2018 18:24:11 GMT
Thanks for that peter. I did actually buy a £13 auxiliary water pump from a scrap E class merc on eBay thinking it might work but when I received it it was obvious from the box size that it was too small and yes it has 20mm hose barbs. I'll use it for another job. Does this one you linked to have 38mm hose barbs? If so then it could well be the right thing. I did think there would be a vehicle part for this. One of the things I noted was that the pump was bolted to a welded bracket and the bolts have come loose. This and engine vibration probably cause the problem of the magnets coming loose. A better solution would be to pad the mounting with some rubber and just cable tie the pump onto it. Eta the engine is a former stationary unit which has been marinised which is why it has the slightly odd water pump arrangement. Skin tank cooled. |
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Post by bargemast on Sept 15, 2018 19:06:34 GMT
Thanks for that peter. I did actually buy a £13 auxiliary water pump from a scrap E class merc on eBay thinking it might work but when I received it it was obvious from the box size that it was too small and yes it has 20mm hose barbs. I'll use it for another job. Does this one you linked to have 38mm hose barbs? If so then it could well be the right thing. I did think there would be a vehicle part for this. One of the things I noted was that the pump was bolted to a welded bracket and the bolts have come loose. This and engine vibration probably cause the problem of the magnets coming loose. A better solution would be to pad the mounting with some rubber and just cable tie the pump onto it. Eta the engine is a former stationary unit which has been marinised which is why it has the slightly odd water pump arrangement. Skin tank cooled. I have really no idea about the hose barb size, therefore you will have to inquire at the sellers, it wouldn't be difficult for them to messure. If the size isn't exactly right, I'm pretty sure that you're clever enough to find the needed pieces to adapt to the right size. Good luck with this small project, Peter. |
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Post by bargemast on Sept 15, 2018 19:09:37 GMT
Don't click on the link !!! don't have to click on this v e r y l o n g link, as you're not looking for an electric coolingwater circula tion pump  .
Peter. |
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Post by bargemast on Sept 15, 2018 19:14:27 GMT
Plenty of secondhand circulation pumps on eBay too, but for this price I wouldn't want to take a risk of getting new problems with an old pump. Piece of mind for a single hander is more important to enjoy relaxed cruising (when you don't have to push too short lock gate balance beams  ). Peter. |
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Post by Deleted on Sept 15, 2018 19:17:04 GMT
Thanks for that peter. I did actually buy a £13 auxiliary water pump from a scrap E class merc on eBay thinking it might work but when I received it it was obvious from the box size that it was too small and yes it has 20mm hose barbs. I'll use it for another job. Does this one you linked to have 38mm hose barbs? If so then it could well be the right thing. I did think there would be a vehicle part for this. One of the things I noted was that the pump was bolted to a welded bracket and the bolts have come loose. This and engine vibration probably cause the problem of the magnets coming loose. A better solution would be to pad the mounting with some rubber and just cable tie the pump onto it. Eta the engine is a former stationary unit which has been marinised which is why it has the slightly odd water pump arrangement. Skin tank cooled. I have really no idea about the hose barb size, therefore you will have to inquire at the sellers, it wouldn't be difficult for them to messure. If the size isn't exactly right, I'm pretty sure that you're clever enough to find the needed pieces to adapt to the right size. Good luck with this small project, Peter. I don't think the litres per minute would be enough. I did think about adapting a smaller pump but as this one has been working well for quite a long time I prefer to keep it similar. There is a sticker on the motor shell but it has been painted over unfortunately. If I was marinising an engine I would take care to put some masking tape over things like pump identification numbers before the paint job. I don't even know if its a 24v pump running on 12v. It could easily be and that would be sensible but the details have been (brush) painted over like the rest of the engine. Its not the end of the world but it is quite shocking. Maybe I will have to dip into my swiss bank account or sell some of the gold. But I would still like to know the voltage at least. The engine is on a 12v starter but I think a 24v pump would probably be okay. Not sure though. As I am planning a round the world trip on this boat next year it does want to be done well. |
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Post by bargemast on Sept 15, 2018 19:25:55 GMT
I have really no idea about the hose barb size, therefore you will have to inquire at the sellers, it wouldn't be difficult for them to messure. If the size isn't exactly right, I'm pretty sure that you're clever enough to find the needed pieces to adapt to the right size. Good luck with this small project, Peter. I don't think the litres per minute would be enough. I did think about adapting a smaller pump but as this one has been working well for quite a long time I prefer to keep it similar. There is a sticker on the motor shell buts been painted over unfortunately. If I was Marinising an engine I would take care to put some masking tape over things like pump identification numbers. I don't even know if its a 24v pump running on 12v. It could easily be but the details have been (brush) painted over. Its not the end of the world but it is quite shocking. Maybe I will have to dip into my swiss bank account or sell some of the gold. If that wouldn't be enough, I recently heard that there's quite a demand for kidneys, for which they are supposedly prepared to pay quite a lot of money, or it would possibly even be an option to swap a kidney directly for a new pump with 38mm connections. There will surely be a solution that will be satisfying for you, one way or another. Peter. |
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Post by Deleted on Sept 16, 2018 5:45:24 GMT
Don't click on the link !!! don't have to click on this v e r y l o n g link, as you're not looking for an electric coolingwater circula tion pump .
Peter.Ross had a better do at finding the unicorn Lucas 13 teeth pinion I needed  |
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