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9th July 2021, 07:15 | #61 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
My engine has always run in the low nineties with the original factory-fitted (in 1999) thermostat, a Circoli replacement (in 2012) and the final part with the four supporting legs bought from an X-Part agent (in 2017). Under test, my factory-fitted (in 1999) thermostat, stamped 82˚ on the housing (as Phil's quote states) actually opens according to the spec. in RAVE which is 88˚ ± 2˚. It may well be that the opening temperature has been lowered, but this could not have been in 1995! I would like to see the engineering drawing from then to which X-Part refers. Edit: Also, I've never seen a Technical Bulletin from MG Rover during the production of the 75/ZT concerning a change of thermostat specification. To avoid low running temperatures (in the eighties) don't change your thermostat! Fit new genuine CDU 3858 'O' rings to the original (safely extracted with the LH inlet manifold removed) and set the straight pipe serrated clips fully outwards. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 14th July 2021 at 07:05.. Reason: Addition |
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9th July 2021, 20:22 | #62 | |
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9th July 2021, 21:40 | #63 |
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i fitted one f the thermostats with the three pegs for stability that stat and the one before it all ran from 91 would reach 100 and the fan would kick in to bring it back down to 91.
I don't know what's going on with these stats but surely there must be some around with the 88c start opening ? 1 2 3 4 It seems these stats have been talked about forever https://www.the75andztclub.co.uk/for...thermostat+88c
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10th July 2021, 07:43 | #64 |
Doesn't do things by halves
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Hello Tom,
Although it looks certain that this is the case, in fact it isn't! What happens is that the 'O' ring at the base of the housing flattens and a fine spray of coolant is then emitted upwards to coat the widest part of the housing; the seam. The solution is as I described in my previous post. Simon
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10th July 2021, 09:36 | #65 | |
I really should get out more.......
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The other option to consider is the single temp sensor may not be reading correctly, i have seen one that got so cooked by over temp the ecu reading never went above 80C based on the sensors resistance reading although using external measurement showed the cooling system was much higher. After the last thermostat change I did I have to agree with you, if the running temp is ok, nothing fractured then reuse what you have and fit new seals, we twice got faulty components from Rimmers, each time the curved pipe had a manufacturing flaw/damage which caused a leak (SIAC parts) the car was with us for over a week before it was sorted and leak free. Try contacting x-part for a copy of the drawing. |
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10th July 2021, 13:49 | #66 | ||
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How could I forget this after staring into many saucepans full of water with thermostats suspended! The temperature when fully open didn't apparently change which also makes me doubt the accuracy of X-Part's reply to you. Quote:
Ha ha! Did I hear someone say "corporate confidentiality"? Thanks for your input Phil, much appreciated. Simon
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10th July 2021, 21:25 | #67 | |
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My head is telling me to buy another stat to achieve a higher temp, my heart isn't really telling me to do the job again for the sake of an 8 to 10° gain! |
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11th July 2021, 06:48 | #68 |
Doesn't do things by halves
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Hi Tom,
Unfortunately a visual diagnosis alone is misleading. Had you filled it with water you'd have been surprised to find no evidence of a split. Nobody does this though, except for me! I fully understand your reluctance to do the job again, particularly when others are finding it difficult to obtain a proper 88˚ thermostat. Simon
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11th July 2021, 07:44 | #69 |
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I'm following the thread since the beginning but I have a very silly question for you because I can't understand where lies the problem:
What's wrong with slightly low-ish temperatures say around 80°? I thought the more dreadful problem was when temperatures were increasing too high... Thank you to enlighten my knowledge.
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11th July 2021, 08:36 | #70 | |
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The way I see it is although 80 is slightly lower than 'ideal' , it is within calibrated range of 75 to 115° , hot enough for the fuelling to be normal and the car seems to run perfectly fine. MPG wise, I am averaging mid 20s around town and 29 ish on a motorway run determined by brim to brim calculations, which appears to be normal for the KV6? |
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