v6 thermostat again

xantiaman · 28th February 2012, 11:54

hi all
i am about to replace the thermostat again due to the v bieng full of water again but im wandering is there any grease/sealant i can put on the sealing rubbers while im in there 2 stop them weeping?i say this because when i changed the stat a few monthes ago i noticed that there was a rough/scratched surface in the alloy housing that the thermostat body pushes into,i presume this was from over zealous removal of the stat sometime in the past maybe by use of a screwdriver 2 remove the broken plastic.from what i can see a very small amount of water is bubbling up past the stat body and the alloy housing so i presume the stat isnt sealing properly.thanks guys

scouseeric · 28th February 2012, 12:03

I wouldn't have thought a sealant type could prevent it weeping because of the pressure build up. Maybe an epoxy hardened filler might work, you would have to 'fill' the gouge and rub it smooth. Good luck

Eric

kaiser · 28th February 2012, 13:06

Quote:

Originally Posted by xantiaman

hi all
i am about to replace the thermostat again due to the v bieng full of water again but im wandering is there any grease/sealant i can put on the sealing rubbers while im in there 2 stop them weeping?i say this because when i changed the stat a few monthes ago i noticed that there was a rough/scratched surface in the alloy housing that the thermostat body pushes into,i presume this was from over zealous removal of the stat sometime in the past maybe by use of a screwdriver 2 remove the broken plastic.from what i can see a very small amount of water is bubbling up past the stat body and the alloy housing so i presume the stat isnt sealing properly.thanks guys

Smooth the surface with a bit of sandpaper. The O-ring will seal anything, as long as the size is right, and the groove not too abrupt.

Use plenty of lubrication when you fit the O-rings.

Check the O-rings you have removed, to see if there is a fault here. Check carefully.

And stop wandering before you get too far away

PS check the plastic housing as well, brand new ones can leak. Check carefully around the welded part and along the seams and don't forget the clips on the rubber pipes. Look carefully for stains, which may give the game away.

xantiaman · 3rd March 2012, 22:32

all stripped down now to reveal the problem.it would seem that when i changed the thermostat the last time i pinched the seaing ring,it hasnt split but is out of shape with a damaged part so that it doesnt sit properly in the grove hence not sealing properly against the wall of the inlet sort of squashed and pulled upwards out of the groove.i only changed it a few monthes ago so it all came apart easily and all i have changed is the sealing washers and inlet gaskets should be finished 2moz.fingers crossed.

xantiaman · 3rd March 2012, 22:34

out of interest what could i lubricate the rubber washers with on assembly?

SD1too · 3rd March 2012, 23:04

Vaseline? WD40?

Simon.

Simon.h · 4th March 2012, 07:21

Then i got my 190, it had a lpg fault and would not run on lpg, and as i still had my V6 160 at the time this give me a good few weeks to get it sorted. As the 190 had done 70k and i counld not find any paper work for the thermostat being changed, so i decided to change it any way.

So i ordered a new stat with all the pipework and a week later went to fix only to find there was Hylomar universal Blue Gasket all round the joints into the block and we all know MGR did not use it, so it must of been replaced. So i saved me a job and i sold the kit on here.

kaiser · 4th March 2012, 07:38

Quote:

Originally Posted by xantiaman

out of interest what could i lubricate the rubber washers with on assembly?

There are a couple of things, from dish washing liquid, petroleum jelly, silicone to specialised stuff like Loc Tite special lubricant.

Also examine the bore and the ring groove. The bore, apart from being smooth and clean, should have a little chamfer to guide the ring in place, and the O-ring groove also a small chamfer to prevent a sharp corner trapping the ring.

The trick, when fitting O-rings is to lubricate well (the bore as well as the ring), press and turn in one motion and make sure your aim is in line with the bore.

Once in place a small retraction and subsequent re-press, will make sure the ring settles in the middle of the groove.

If you have avoided nicking the ring, it should now seal for many years to come, as the rubber is now in compression from all sides. It is a very good sealing method when done correctly.

chris75 · 4th March 2012, 13:47

Quote:

Originally Posted by kaiser

There are a couple of things, from dish washing liquid, petroleum jelly, silicone to specialised stuff like Loc Tite special lubricant.

Yes indeed , for reassembly Fairy liquid has always served me well

28th February 2012, 11:54	#1
xantiaman Avid contributor ROVER 75 SALOON 2.0 v6 connoisseur Join Date: Dec 2010 Location: corsham Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	v6 thermostat again hi all i am about to replace the thermostat again due to the v bieng full of water again but im wandering is there any grease/sealant i can put on the sealing rubbers while im in there 2 stop them weeping?i say this because when i changed the stat a few monthes ago i noticed that there was a rough/scratched surface in the alloy housing that the thermostat body pushes into,i presume this was from over zealous removal of the stat sometime in the past maybe by use of a screwdriver 2 remove the broken plastic.from what i can see a very small amount of water is bubbling up past the stat body and the alloy housing so i presume the stat isnt sealing properly.thanks guys

3rd March 2012, 23:04	#6
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,382 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Vaseline? WD40? Simon. __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

4th March 2012, 07:21	#7
Simon.h This is my second home Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010 Location: Calne Posts: 4,531 Thanks: 8 Thanked 116 Times in 108 Posts	Then i got my 190, it had a lpg fault and would not run on lpg, and as i still had my V6 160 at the time this give me a good few weeks to get it sorted. As the 190 had done 70k and i counld not find any paper work for the thermostat being changed, so i decided to change it any way. So i ordered a new stat with all the pipework and a week later went to fix only to find there was Hylomar universal Blue Gasket all round the joints into the block and we all know MGR did not use it, so it must of been replaced. So i saved me a job and i sold the kit on here. __________________ Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg

28th February 2012, 12:03	#2
scouseeric Passed Away 75 contemporary se cdti Join Date: Dec 2010 Location: Liverpool Posts: 1,579 Thanks: 0 Thanked 0 Times in 0 Posts	I wouldn't have thought a sealant type could prevent it weeping because of the pressure build up. Maybe an epoxy hardened filler might work, you would have to 'fill' the gouge and rub it smooth. Good luck Eric

3rd March 2012, 22:32	#4
xantiaman Avid contributor ROVER 75 SALOON 2.0 v6 connoisseur Join Date: Dec 2010 Location: corsham Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	all stripped down now to reveal the problem.it would seem that when i changed the thermostat the last time i pinched the seaing ring,it hasnt split but is out of shape with a damaged part so that it doesnt sit properly in the grove hence not sealing properly against the wall of the inlet sort of squashed and pulled upwards out of the groove.i only changed it a few monthes ago so it all came apart easily and all i have changed is the sealing washers and inlet gaskets should be finished 2moz.fingers crossed.

3rd March 2012, 22:34	#5
xantiaman Avid contributor ROVER 75 SALOON 2.0 v6 connoisseur Join Date: Dec 2010 Location: corsham Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	out of interest what could i lubricate the rubber washers with on assembly?