Diesel thermostat definative answer - Page 90

wuzerk · 22nd January 2011, 12:01

DAVID: As Mintee says there is a very small relief in the Chevy rim, so small that I didn't spot it and drilled experimental holes on the first attempt.(Meziere themselves advised me to drill two 4mm holes in it)You can see it if you hold it up to the light.
PAUL: If you are using the British housing them you have to be careful if using a different thermostat to the one supplied. If the new 'stat has a thinner
profile around the edge then it may allow coolant to seep through when it is closed, I did say, several pages ago that it might be necessary to use some sealer on the rim. The Meziere housing comes with a gasket which sits over the rim of the stat so there is no problem there.

Mintee · 22nd January 2011, 12:59

Quote:

Originally Posted by David Lawrence

Do you think that's there by design of a product of how the part is punched out at manufacture?

Yes.

Quote:

Originally Posted by David Lawrence

How big is your nip?

Didn't measure it. Pretty small.

Quote:

Originally Posted by David Lawrence

I poured water in and it does indeed escape. Guess that puts me back to square one in terms of explaining the different performance.

In what way? I think any 'hole' is only there to avoid a possible air lock. I doubt it does much (unless it is pretty large) to effect the operation of the thermostat.

David Lawrence · 22nd January 2011, 18:35

Quote:

Originally Posted by Mintee

Yes.

Didn't measure it. Pretty small.

In what way? I think any 'hole' is only there to avoid a possible air lock. I doubt it does much (unless it is pretty large) to effect the operation of the thermostat.

In the way that it now seems my thermostat is exactly the same as yours and Wuzerks but I see temperatures of 103 from time to time whereas you guys get nearer 88+-2. I was hoping there would be an obvious difference, but alas not.

David Lawrence · 22nd January 2011, 18:48

Quote:

Originally Posted by wuzerk

DAVID: As Mintee says there is a very small relief in the Chevy rim, so small that I didn't spot it and drilled experimental holes on the first attempt.(Meziere themselves advised me to drill two 4mm holes in it)You can see it if you hold it up to the light.

So when you drilled your experimental holes, what was the impact?

Mintee · 22nd January 2011, 19:52

Quote:

Originally Posted by David Lawrence

In the way that it now seems my thermostat is exactly the same as yours and Wuzerks but I see temperatures of 103 from time to time whereas you guys get nearer 88+-2. I was hoping there would be an obvious difference, but alas not.

Are you using one their 195°F Chevy thermostats? Why not try another, slightly lower operating temperature one? They only cost a few quid and are trivial to change.

wuzerk · 22nd January 2011, 20:10

DAVID: I drilled one hole in my first Chevy 195F(90.5C) 'stat and, although It improved my temperatures well, It was not by as much as I expected. My previous best was 74C with the original failed item. On the second 'stat I drilled a smaller 1mm hole only,(before I spotted the inbuilt bleed hole). I have now blocked the 1mm hole with 2 part epoxy. I think that it is highly likely that you would get lower readings merely by fitting another Chevy 'stat since everything else is the same as mine and Mintees.

David Lawrence · 22nd January 2011, 20:22

Quote:

Originally Posted by Mintee

Are you using one their 195°F Chevy thermostats? Why not try another, slightly lower operating temperature one? They only cost a few quid and are trivial to change.

yes I am using the 195F chevy stat. I'll try drilling a small hole first, nothing to lose. Meziere suggest two 4mm holes, but that seems a bit drastic.

philjudo · 22nd January 2011, 20:27

http://cgi.ebay.co.uk/Rover-75-MGZT-...-/370476153133

Good idea or dangerous for the engine????
__________________

David Lawrence · 22nd January 2011, 20:29

Quote:

Originally Posted by wuzerk

DAVID: I drilled one hole in my first Chevy 195F(90.5C) 'stat and, although It improved my temperatures well, It was not by as much as I expected. My previous best was 74C with the original failed item. On the second 'stat I drilled a smaller 1mm hole only,(before I spotted the inbuilt bleed hole). I have now blocked the 1mm hole with 2 part epoxy. I think that it is highly likely that you would get lower readings merely by fitting another Chevy 'stat since everything else is the same as mine and Mintees.

As it happens I bought a spare chevy stat at the same time at the first, so if the hole has no improvement then I'll swap it with the spare.

wuzerk · 22nd January 2011, 20:31

PHILJUDO:This is the British made version of the Meziere(USA) in line housing. Quite a few of us are using this system now. I have had no problems after about four months use.

22nd January 2011, 12:01	#891
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Holes DAVID: As Mintee says there is a very small relief in the Chevy rim, so small that I didn't spot it and drilled experimental holes on the first attempt.(Meziere themselves advised me to drill two 4mm holes in it)You can see it if you hold it up to the light. PAUL: If you are using the British housing them you have to be careful if using a different thermostat to the one supplied. If the new 'stat has a thinner profile around the edge then it may allow coolant to seep through when it is closed, I did say, several pages ago that it might be necessary to use some sealer on the rim. The Meziere housing comes with a gasket which sits over the rim of the stat so there is no problem there. Last edited by wuzerk; 22nd January 2011 at 12:06..

22nd January 2011, 20:10	#896
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Holes DAVID: I drilled one hole in my first Chevy 195F(90.5C) 'stat and, although It improved my temperatures well, It was not by as much as I expected. My previous best was 74C with the original failed item. On the second 'stat I drilled a smaller 1mm hole only,(before I spotted the inbuilt bleed hole). I have now blocked the 1mm hole with 2 part epoxy. I think that it is highly likely that you would get lower readings merely by fitting another Chevy 'stat since everything else is the same as mine and Mintees.

22nd January 2011, 20:27	#898
philjudo Posted a thing or two rover 75 CDTI Saloon Club SE Join Date: Dec 2006 Location: Birmingham Posts: 1,300 Thanks: 51 Thanked 40 Times in 27 Posts	http://cgi.ebay.co.uk/Rover-75-MGZT-...-/370476153133 Good idea or dangerous for the engine???? __________________ __________________ [SIGPIC][/SIGPIC]

22nd January 2011, 20:31	#900
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Housing PHILJUDO:This is the British made version of the Meziere(USA) in line housing. Quite a few of us are using this system now. I have had no problems after about four months use.