jimbob01 Posted July 9, 2016 Report Share Posted July 9, 2016 Hi all, I had a guy look at my jp3 and he said the thermostat bypass for quick warm up should return to the outlet side of the jabsco pump because the impeller will get very hot if it goes on the pump intake.... . Technical advise welcome ? Link to comment Share on other sites More sharing options...
by'eck Posted July 9, 2016 Report Share Posted July 9, 2016 (edited) Bullshit. It should T into the pump inlet with skin tank return, as I suspect it already does. Note that this bypass is usually the point where a calorifier coil is inserted I.e. thermostat to coil inlet then coil outlet to pump inlet Edited July 9, 2016 by by'eck Link to comment Share on other sites More sharing options...
frangar Posted July 9, 2016 Report Share Posted July 9, 2016 Bullshit. It should T into the pump inlet with skin tank return, as I suspect it already does. Note that this bypass is usually the point where a calorifier coil is inserted I.e. thermostat to coil inlet then coil outlet to pump inlet Yep....what he said! Cheers Gareth Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 Yes it goes into the inlet... The impeller / pump gets very warm... Is this normal? Thanks Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 So to clarify as I'm pretty simple and not that learned about engines (I know some basics) : is it ok that the jabsco water pump gets hot? Link to comment Share on other sites More sharing options...
RLWP Posted July 9, 2016 Report Share Posted July 9, 2016 So to clarify as I'm pretty simple and not that learned about engines (I know some basics) : is it ok that the jabsco water pump gets hot? Is it the water or the pump that gets hot? Richard Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 The pump is hot and so is the water. Link to comment Share on other sites More sharing options...
RLWP Posted July 9, 2016 Report Share Posted July 9, 2016 Is there a model number on the pump cover? http://jabscotech.com/technical-documents/ Richard Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 It's a jabsco and on the front it says 6490-231 or 271 can't quite make that bit out. Link to comment Share on other sites More sharing options...
RLWP Posted July 9, 2016 Report Share Posted July 9, 2016 This one?: http://www.xylemflowcontrol.com/files/6400_7420_43000-0011.pdf TEMPERATuRES Neoprene: 45°-180° F (7°-82° C) Nitrile: 50°-180° F (10°-82° C) Natural Rubber: 33°-120° F (0.6°-49° C) The 'standard' impeller seems to be Neoprene, so up to 82° C will be OK. That's pretty hot Richard Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 Thanks for your time Richard, I was just concerned I'd plumbed something in wrong, it's the first time Ive plumbed in one of these engines and I've only run it for a few hours, the hottest I've seen so far is 65 deg which doesn't open the thermostat and so doesn't yet fully go round the skin tank... I intend a trip out shortly and I'm on the tidal Thames so didn't fancy burning out an impeller straight away! Thanks jim Link to comment Share on other sites More sharing options...
RLWP Posted July 9, 2016 Report Share Posted July 9, 2016 No problem, I enjoy these little challenges Richard Link to comment Share on other sites More sharing options...
David Mack Posted July 9, 2016 Report Share Posted July 9, 2016 Hi all, I had a guy look at my jp3 and he said the thermostat bypass for quick warm up should return to the outlet side of the jabsco pump because the impeller will get very hot if it goes on the pump intake.... . Technical advise welcome ? If the bypass returns to the outlet side of the pump what would actually circulate water around the bypass? Link to comment Share on other sites More sharing options...
jimbob01 Posted July 9, 2016 Author Report Share Posted July 9, 2016 Very good point ? Link to comment Share on other sites More sharing options...
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