revilla Posted August 14, 2013 Share Posted August 14, 2013 Whilst changing the head gasket, just removed the water pump from my K-Series VVC and compared it with the new one I have read for reassembly. They are quite different, see here. The old one has a large cast fitting that the new one is missing. Can I fit the new one in place of the old one or have I got the wrong part? If I used the new one, do I leave the small black plastic cap in place or remove it (it seems very loose so I assume remove it)? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 14, 2013 Member Share Posted August 14, 2013 A couple of years ago James Whiting was changing my cam belt. He prefers the old sort of water pump and put my original one back in rather than a new one after having a good look. Jonathan Edited by - Jonathan Kay on 14 Aug 2013 22:44:14 Link to comment Share on other sites More sharing options...
Mankee Posted August 14, 2013 Share Posted August 14, 2013 Are they both genuine OEM (Land) Rover pumps? Link to comment Share on other sites More sharing options...
revilla Posted August 14, 2013 Author Share Posted August 14, 2013 I guess the old one is original. The new one is a Unipart replacement - but I thought they were a reputable replacement part to OEM standard? Link to comment Share on other sites More sharing options...
garybee Posted August 14, 2013 Share Posted August 14, 2013 The "large cast fitting" is an 'evaporator'. It is designed to evaporate any drips of coolant that make it past the shaft seal. Coolant degrades the cam belt. You are fine to fit either but you will probably get people telling you that one or the other is best. Essentially...the evaporator may stop your timing belt degrading due to coolant contamination. As it does this by evaporating small leaks past the shaft seal it could hide the early signs of water pump failure. If your water pump fails and dumps all the coolant on the ground you could quickly cook your engine. If your timing belt fails your engine will smash all the valves into the pistons. Link to comment Share on other sites More sharing options...
revilla Posted August 14, 2013 Author Share Posted August 14, 2013 Garybee thank you for that comprehensive explanation, I had read about the evaporator now you mention it but I hadn't realised that was it! Link to comment Share on other sites More sharing options...
oilyhands Posted August 15, 2013 Share Posted August 15, 2013 Additionally, some pumps have plastic impellors which have a habit of coming loose, others have stressed steel impellors, the best have cast impellors. If yours is plastic, return it and get a quality replacement. Oily Link to comment Share on other sites More sharing options...
revilla Posted August 15, 2013 Author Share Posted August 15, 2013 Oily - Thanks. The one I got looks like what you describe as "stressed steel" but it's going back and there's a new MG Rover original on its way. Have sent you a BM about getting a gasket... Link to comment Share on other sites More sharing options...
oilyhands Posted August 15, 2013 Share Posted August 15, 2013 Sorry, that should have read 'pressed' steel, damned ipad autocorrect... Oily Link to comment Share on other sites More sharing options...
revilla Posted August 15, 2013 Author Share Posted August 15, 2013 Haha yes I did wonder in what sense it was stressed! Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted August 15, 2013 Member Share Posted August 15, 2013 It was the metal/ plastic distinction that James mentioned too. Jonathan Link to comment Share on other sites More sharing options...
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