npanne Posted May 12, 2012 Share Posted May 12, 2012 How freely should a new water pump turn?I've just bought a replacement one, but it feels to my mind that there is too much resistance - it doesn't "spin" if turned by hand, for example, the friction stops it as soon as I let go - is this normal? Link to comment Share on other sites More sharing options...
Velocita Rosso Posted May 12, 2012 Share Posted May 12, 2012 Yes thats right, but not too tightIt should not spin too freely though Link to comment Share on other sites More sharing options...
junkuser Posted May 12, 2012 Share Posted May 12, 2012 The drag you are feeling is due to the seal which is basically two flat surfaces forced together by a spring. There is some lubrication during use from the water.The original pumps had a carbon ring running on the cast iron of the pump body but "modern" ones use a ceramic ring. Link to comment Share on other sites More sharing options...
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