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

Reply
 
Thread Tools Display Modes
Old 10th March 2022, 14:51   #1
donc
Avid contributor
 
Rover 75

Join Date: Sep 2018
Location: Kirk Ella
Posts: 141
Thanks: 9
Thanked 43 Times in 14 Posts
Default Water top up

My 1.8t has needed topping up with about half a pint of antifreeze about every 100 miles. The headgasket was done about eighteen months ago. Could there be any other reason than the head for this leakage? I can't see any obvious leaks. Would welcome opinions.
donc is offline   Reply With Quote
Old 10th March 2022, 15:32   #2
stevestrat
This is my second home
 
ZT260 #243 (resting)

Join Date: May 2010
Location: Prestonpans
Posts: 22,424
Thanks: 650
Thanked 4,624 Times in 3,358 Posts
Default

Possibly inlet manifold gasket. Leaks when the engine cools down allowing a little coolant into the cylinders which burns off once the engine starts. The leak itself seals once everything warms up and expands. Is there any evidence of a misfire on start up or steam from the exhaust which disappears after a minute or so. Check the spark plugs as well, if one (or more) is exceptionally clean its evidence of any leaked coolant burning off, effectively steam cleaning the plug.
__________________
Steve


T4 Location Map
stevestrat is offline   Reply With Quote
Old 10th March 2022, 15:43   #3
euro44
Avid contributor
 
mg zt-t 226th made from total of 396

Join Date: Nov 2019
Location: chelmsford
Posts: 155
Thanks: 175
Thanked 55 Times in 37 Posts
Default

check the cap on the expansion tank first. the rubber/ plastic sealing rings can get aged quickly and allow coolant to overflow. new cap from German supplier stopped my problem for £ 12.00. second check for signs of dried coolant around all water pipes especially near jubilee clips that get over tightened.
euro44 is offline   Reply With Quote
Old 10th March 2022, 15:55   #4
donc
Avid contributor
 
Rover 75

Join Date: Sep 2018
Location: Kirk Ella
Posts: 141
Thanks: 9
Thanked 43 Times in 14 Posts
Default Water top up

The manifold gasket was replaced when the head was done and I've replaced the radiator cap!
donc is offline   Reply With Quote
Old 10th March 2022, 18:20   #5
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Quote:
Originally Posted by donc View Post
The manifold gasket was replaced when the head was done and I've replaced the radiator cap!
Could still leak though. Check the fixings are tight.---
COLVERT is offline   Reply With Quote
Old 10th March 2022, 18:27   #6
stevestrat
This is my second home
 
ZT260 #243 (resting)

Join Date: May 2010
Location: Prestonpans
Posts: 22,424
Thanks: 650
Thanked 4,624 Times in 3,358 Posts
Default

Quote:
Originally Posted by donc View Post
The manifold gasket was replaced when the head was done and I've replaced the radiator cap!
OK. How much coolant are you putting in the tank? The max level is right at the bottom of the tank and any excess will be ejected.

Next, is it the original plastic manifold because they can become distorted.
__________________
Steve


T4 Location Map
stevestrat is offline   Reply With Quote
Old 10th March 2022, 20:56   #7
euro44
Avid contributor
 
mg zt-t 226th made from total of 396

Join Date: Nov 2019
Location: chelmsford
Posts: 155
Thanks: 175
Thanked 55 Times in 37 Posts
Default

Yes filling above the bottom of the fins will get expelled till it gets to that level ( my first mistake on getting my ztt ) it feels strange at first leaving it looking so low but if there are no leaks it will stay that way . worth checking that when the head was done the system was bled to remove air ,which can also blow excess out and then leave the system short.
euro44 is offline   Reply With Quote
Old 11th March 2022, 12:48   #8
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,710
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

That’s a lot to lose! Have a look at the metal pipe that runs around the rear of the block, and the plastic thermostat housing at the end of it, both of those are known for leaking.
__________________
Lest we forget..
trikey is offline   Reply With Quote
Old 11th March 2022, 15:56   #9
donc
Avid contributor
 
Rover 75

Join Date: Sep 2018
Location: Kirk Ella
Posts: 141
Thanks: 9
Thanked 43 Times in 14 Posts
Default Water top up

Thanks everyone for the advice. Will try to narrow down. Wish you lived near Tricky!!
donc is offline   Reply With Quote
Old 11th March 2022, 16:21   #10
Yorkshire GOC
I really should get out more.......
 
Yorkshire GOC's Avatar
 
Rover 75 connoisseur se v6 auto

Join Date: May 2014
Location: Hull
Posts: 2,057
Thanks: 1,842
Thanked 623 Times in 469 Posts
Default

Quote:
Originally Posted by donc View Post
Thanks everyone for the advice. Will try to narrow down. Wish you lived near Tricky!!
Ah yes those were the days when he was in Barton
__________________
She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
Yorkshire GOC 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 13:50.


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