Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club General Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 13th September 2019, 13:18   #11
Blink
Posted a thing or two
 
Blink's Avatar
 
Rover 75 Saloon

Join Date: Apr 2019
Location: Under the car
Posts: 1,840
Thanks: 210
Thanked 244 Times in 221 Posts
Default

Quote:
Originally Posted by mileshawk56 View Post
... What do you think? ..
I think they should have designed the whole thing with an obvious 'stop point' beyond which it will not turn (like all the other cars I've ever had). That way you know whether it's properly on or not.

If you hit the end stop, it's on - if you don't, it's not. No guesswork.
Blink is offline   Reply With Quote
Old 13th September 2019, 13:27   #12
suzublu
This is my second home
 
suzublu's Avatar
 
rover 75 1.8 vvc club se wedgwood blue

Join Date: Aug 2009
Location: Seaton Carew
Posts: 26,880
Thanks: 65
Thanked 7,142 Times in 4,642 Posts
Default

TC's definitive post https://www.the75andztclub.co.uk/for...d.php?t=245253
suzublu is offline   Reply With Quote
Old 13th September 2019, 16:27   #13
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by mileshawk56 View Post
My MGZTKV6 2.5 has run very hot of late ... the temperatures are now spot on.
Out of interest Chris, what figures did you observe for "very hot" and "spot on"?
Also, when the car is moving, is the temperature now stable within about +3˚?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 13th September 2019, 16:39   #14
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Quote:
Originally Posted by SD1too View Post
Out of interest Chris, what figures did you observe for "very hot" and "spot on"?
Also, when the car is moving, is the temperature now stable within about +3˚?

Simon
117 degrees when "very hot" and 94 degrees running spot on

The phone call came in regard to this car couple of days ago, and given the fact it had expelled all of it's coolant over the engine bay, I surmised that the cap was defective, in all probability.

The suggestion was to force the fan outputs with T4 ( all three working satisfactorily ) vacuum fill the car with coolant, and fit another cap, which was carried out according to the official MGR technique, and lo and behold all is good again

So Chris could have saved a couple of hours labour by not buying a "genuine" cap from a source I'm not going to name

At least he had the presence of mind not to refill the coolant (5 litres) lost until the engine had cooled

Brian
marinabrian is offline   Reply With Quote
Old 13th September 2019, 17:45   #15
mileshawk56
Posted a thing or two
 
mileshawk56's Avatar
 
MGZT

Join Date: Jul 2015
Location: Berkshire
Posts: 1,272
Thanks: 1,738
Thanked 299 Times in 216 Posts
Default

I accept Brians stricture regarding the genuine article but in my defence how do you know what is the genuine article? Even cost cant make that a certainty. I am however happy at this moment to accept I must tighten the cap until it stops and try harder to establish genuine articles. With this in view we must remember our cars have been out of production for 15 years with the a diminishing "official" support organisation and the growth of replacement parts of "apparent" similar quality. Its a lottery and in this instance I will hope I have a better chance of winning with the Xpart cap, note better chance not certainty! Thanks to all and hope not to reurn to this subject. Chris S.
mileshawk56 is offline   Reply With Quote
Old 13th September 2019, 18:47   #16
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

In my opinion, the overheating was caused by an air lock. That's what Brian's vacuum refill resolved. The running temperature isn't controlled by how tight or slack the pressure cap may be, nor is it affected by its relief pressure rating, or whether the seals leak or not. Certainly, coolant may be lost if the seals are bad and the coolant gets hot enough, but this isn't a cause and effect. Coolant loss in this way will eventually result in contstant overheating, but changing a bad cap for a good one has no direct effect on the running temperature.


TC
T-Cut is offline   Reply With Quote
Old 13th September 2019, 18:55   #17
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Quote:
Originally Posted by mileshawk56 View Post
The cap looks like any other, on the top embossed safety advice and in the centre 140
140 is the now standard relief pressure rating for all 75/ZT engines. It indicates 140 mPa (milliPascals), which is around 1.4Bar or about 23psi.

Quote:
turn it over and the following round the bottom rim- PA 66 GF 30.
That's simply the cose for the plastic it's made from (PolyAmide i.e. Nylon filled with 66% glass fibre). It's the standard for auto plastics.

Quote:
the orange part has a rectangle with No, repeat No number 140, but round the periphery REUTTER.
Reutter is the manufacturer and appears on standard MGR caps.

TC
T-Cut is offline   Reply With Quote
Old 13th September 2019, 18:56   #18
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Double post.


TC

Last edited by T-Cut; 14th September 2019 at 15:03..
T-Cut is offline   Reply With Quote
Old 13th September 2019, 20:40   #19
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Quote:
Originally Posted by mileshawk56 View Post
I accept Brians stricture regarding the genuine article but in my defence how do you know what is the genuine article? Even cost cant make that a certainty. I am however happy at this moment to accept I must tighten the cap until it stops and try harder to establish genuine articles. With this in view we must remember our cars have been out of production for 15 years with the a diminishing "official" support organisation and the growth of replacement parts of "apparent" similar quality. Its a lottery and in this instance I will hope I have a better chance of winning with the Xpart cap, note better chance not certainty! Thanks to all and hope not to reurn to this subject. Chris S.
Chris, it wasn't a dig at you................I've seen faulty pressure caps supplied from the same source as the chocolate KV6 thermostat and garbage rear wheel bearings.

To be fair, there will be a difference between this..........made in Austria



And this...............

LINK

Made by the Wanjitown Siming Mountain Lawnmower and Dangerous Toy Company "OEM" brand


Brian
marinabrian is offline   Reply With Quote
Old 13th September 2019, 21:52   #20
mileshawk56
Posted a thing or two
 
mileshawk56's Avatar
 
MGZT

Join Date: Jul 2015
Location: Berkshire
Posts: 1,272
Thanks: 1,738
Thanked 299 Times in 216 Posts
Default

No sweat I didn't take umbrage just stating what I had learned and also interesting the point of Tcuts about an air lock- you learn something new every day. Thanks to you all. Chris S.
mileshawk56 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 12:58.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd