Simon Ephithite Posted July 29, 2012 Share Posted July 29, 2012 How do I check water pump working?-over temp problem changed stat-changed sender-flushed- de air locked (I hope) still temp gauge goes full scale along with top hoses getting very hot, appears to be no circulation. Thanks. Link to comment Share on other sites More sharing options...
Myles Posted July 29, 2012 Share Posted July 29, 2012 Depending on your set up, you might be able to see a jet of fluid into the expansion tank from the bleed pipe. The only way I can think of being absolutely sure (but also cover in coolant!) is to crack the bleed bolt on the rad slightly. If the engine is started from cold, there can't be any heat-related pressure - but you should get pump-generated pressure from the off. Personally, i'd hope to rely on feeling the rad as the engine was up - assuming your stat works and was installed correctly. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted July 29, 2012 Leadership Team Share Posted July 29, 2012 It's more likely to be air than a knackered pump - they're pretty robust. Did you drill a small hole (eg. 2 to 3mm) in the new stat? Stu. Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 29, 2012 Author Share Posted July 29, 2012 hole drilled Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted July 29, 2012 Leadership Team Share Posted July 29, 2012 I think I'd just swap it! Stu. Link to comment Share on other sites More sharing options...
Englishmaninwales Posted July 29, 2012 Share Posted July 29, 2012 I suspect you'll find the pump is ok, as Stu says they are robust. I'd suspect you have an airlock, especially if you have a wet liner block 1400cc K, which are very difficult to refil and bleed. Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 29, 2012 Author Share Posted July 29, 2012 1.8 supersport have tried all the tricks for air lock release-have vey sore thumbs from massaging the hoses. think I wil arrange to change pump Link to comment Share on other sites More sharing options...
anthonym Posted July 29, 2012 Share Posted July 29, 2012 remove the thermostat and see if problem goes away. Sounds like stat or air lock. New stats can be faulty. Stick it in a pan of (hot!) water and see what temp it opens. Meanwhile leave it out of the car while problem managed. Remove/release *not the fan* belt (edit: see next message for correction to this comment by SMT25, sorry I am currently working on a Ford engine)) and see if pump goes round without unwanted (grinding, graunching, rumbling) noises. Should be no play to speak of. Otherwise I vote airlock. Squeezing hoses isn't the complete process for airlocks (you haven't said what you have tried); lots on here about that, T pieces seem to be favoured. Edited by - anthonym on 29 Jul 2012 12:07:06 Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted July 29, 2012 Share Posted July 29, 2012 Water pump is driven by cam belt. You could use cam locking tool, then put a spot of Tippex on belt edge and each pulley to ensure you refit it correctly, then slacken adjuster and remove it to spin WP pulley by hand as suggested above. Some have plastic impellers I believe, which can fracture. Replaced my pump when engine out at about 48k - it was just starting to leak. New pump had a metal impeller Edited by - Stationary M25 Traveller on 29 Jul 2012 11:33:35 Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 29, 2012 Author Share Posted July 29, 2012 will remove stat later and check into pump with mirror then if still problomatic new pump!!, have bleed tee fitted. Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted July 29, 2012 Area Representative Share Posted July 29, 2012 Simon, It's very very unlikely to be the coolant pump! It sounds VERY like an air lock to me. I suspect you still have air in the head. Is the nipple that runs from the end of the plenum back to the to of the header tank clear? There is a non return valve in the head end of the nipple that is supposedb to allow air out of the head, but then prevent coolant flowing. It often gets gummed up so is not clear to allow air to escape from the head. Stick a bit of hose on it and see if you can blow into it. If you can't, the try poking into the nipple with a small allen key or something similar until you can blow back into the head. Link to comment Share on other sites More sharing options...
anthonym Posted July 29, 2012 Share Posted July 29, 2012 yes very hard to see it being the pump - and I was also thinking air in the head and the above is a very interesting bit of info. Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 29, 2012 Author Share Posted July 29, 2012 blown down tube all seems ok, will advise of findings later Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 29, 2012 Author Share Posted July 29, 2012 stat out STILL getting very hot just takes slightly longer to get there, seems to be no pressure therfore still points to pump? Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted July 29, 2012 Leadership Team Share Posted July 29, 2012 When you had the stat housing out were you able to see anything amiss with the impellar? Without turning the engine over, will it rotate? Stu. Link to comment Share on other sites More sharing options...
anthonym Posted July 29, 2012 Share Posted July 29, 2012 no pressure? observed how? Link to comment Share on other sites More sharing options...
Simon Ephithite Posted July 30, 2012 Author Share Posted July 30, 2012 Impeller looked fine did not turn, when taking off expansion tank cap no pressure. Have left her with front elevated and will try yet again tonight. Link to comment Share on other sites More sharing options...
Simon Ephithite Posted August 2, 2012 Author Share Posted August 2, 2012 Just confirmed as HGF Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 2, 2012 Leadership Team Share Posted August 2, 2012 ☹️ The cause or the result of the overheating? Stu. Link to comment Share on other sites More sharing options...
Simon Ephithite Posted August 2, 2012 Author Share Posted August 2, 2012 Cause Link to comment Share on other sites More sharing options...
anthonym Posted August 2, 2012 Share Posted August 2, 2012 sympathies. Link to comment Share on other sites More sharing options...
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