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14th September 2023, 19:21 | #11 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
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The leak is due to flattened 'O' rings, nothing more, so don't waste your money on a third new thermostat. Just buy four official X-Part 'O' rings* (CDU 3858) from E Car Parts Ltd. Fit these to your existing pipework and after final assembly the two serrated clips on the straight pipe must be moved fully outwards within their grooves. This operation ensures that the three plastic components are held rigidly and your 'O' rings will no longer flatten. My engine has now been leak-free for six years following my discovery that this is the reason for the coolant loss. * I have measured 'O' rings from some other suppliers and found them to be out of specification so it's not worth taking the risk. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 14th September 2023 at 19:23.. |
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14th September 2023, 22:45 | #12 |
Loves to post
Rover 75 Tourer Join Date: Nov 2014
Location: Penzance
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Cool. How easy is it to see if the housing itself is leaking or not? Note I'll be handing it over to my friendly garage to do the work whichever it is, along with some other stuff.
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2005 Connoisseur 2.5 auto SE Tourer in BRG with Sandstone Beige and Black piping interior (the 2nd of only 7 Rover 75s produced 5th November 2004, and it’s the 244th of 303 facelift British Racing Green 75 tourers built worldwide). All I've done is add Rover walnut gear knob and handbrake... 2016 Vauxhall Viva SL (Father Jack) "assisted manual" (auto) in purple. Going rusty underneath already... |
15th September 2023, 07:48 | #13 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,394
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
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Quote:
That can't be proved visually. If there are dried antifreeze deposits around the seam then you'll be told that it's leaking. In fact, it will be the 'O' ring which has flattened causing pressurised coolant to spray upwards and hit the seam; Q.E.D! But the crucial operation is the setting of the serrated clips as I've described. This obviously wasn't done on the last two occasions. You'll need to advise your garage accordingly this time. Good luck. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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