Found my elusive water leak. - Forums
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 5 (permalink) Old 12-03-2015, 18:11 Thread Starter
Registered User
Join Date: Sep 2010
Location: Stockport, Gtr. Manchester
Car: Red MGf 1.8vvc, Silver MGf 1.8, Triumph GT6, Renault Grand Scenic 7 str, Rover 100 Cabriolet.
Posts: 970
Found my elusive water leak.

Since I bought my silver MGf a couple of years ago with the intention of restoring it, it has been plagued with an intermittent water leak, the car hasn't been on the road but whilst starting it now and again I have noticed the coolant level would drop or sometimes just disappear altogether, it looked like it was coming from the bottom of the cam belt cover and I originally suspected the water pump however after changing the pump I still had the leak which never dripped out while you were watching it.

Today I decided to take out the thermostat housing because I could see pink fluid on the engine case under the housing and had previously replaced the thermostat and wondered if I'd not bolted the two halves of the housing together correctly.

When I unbolted the retaining bolt for the housing after removing the coolant pipes, the housing came away from the back of the water pump without any effort but left part of the housing still inside the hole, I removed it with a screwdriver and found that the flange of the thermostat housing had perished causing it to break which is the cause of my intermittent leak.

Because the housing is bolted to the side of the engine block and couldn't move and the rubber seal was still in place it didn't leak all the time only it seems after I had let the engine get very hot and then cool down, some pictures below of the offending part.

So the new thermostat housing is in place, I just need to pipe everything up tomorrow put my new engine temperature sensor in and see if that cures the radiator fan fault, onward and upward as they say.
bennygoodman is offline  
Sponsored Links
post #2 of 5 (permalink) Old 12-03-2015, 19:17
Chris T's Avatar
Join Date: Feb 2005
Location: Leicestershire
Car: MG TF 135 Platinum Silver, Skoda Roomster
Posts: 32,606
That's interesting, I've never seen a thermostat housing fail.
Chris T is offline  
post #3 of 5 (permalink) Old 12-03-2015, 20:17
Registered User
Join Date: Nov 2011
Location: Tredegar Gwent.
Car: MGTF 115 Sunstorm/Rover 45 Spirit/1977 Scimitar SE6A 3000V6/Saab 93t convertible.
Posts: 2,786
I have not seen one snap either,but it does not surprise me,they can go brittle,i would think. Early 1990's 200's had alloy thermostat housings.
rob dunster is offline  
post #4 of 5 (permalink) Old 13-03-2015, 14:19
Registered User
Join Date: May 2011
Location: Strathaven
Car: MGF
Posts: 807
How old is the car? I've got an untraceable slow leak - mine's 19 years old.
michaelcngm is offline  
post #5 of 5 (permalink) Old 13-03-2015, 14:55 Thread Starter
Registered User
Join Date: Sep 2010
Location: Stockport, Gtr. Manchester
Car: Red MGf 1.8vvc, Silver MGf 1.8, Triumph GT6, Renault Grand Scenic 7 str, Rover 100 Cabriolet.
Posts: 970
It's a 1996 MGf MPI, I put it all back together today and my leak problem seems to have disappeared, I'll monitor it for a while.
bennygoodman is offline  


Quick Reply

Register Now

In order to be able to post messages on the Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:

Similar Threads
Thread Thread Starter Forum Replies Last Post
Finally found my small water leak wullie480 MG ZT / Rover 75 (Sponsored by Rimmer Bros) 0 16-11-2014 16:53
I have found my water leak! Furryroo MG ZS / Rover 45 & 400 10 21-03-2013 08:59
Water leak found lowedb MG ZS / Rover 45 & 400 4 21-10-2011 17:46
Found my water leak I think... Kryt MG ZS / Rover 45 & 400 7 01-04-2007 11:23

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome