Mi16 Thermostat Constant Leaking?

[yorkshirekowboy 19 1 Cars]

Hello, right I've put my coolant in, but it keeps leaking between the face of the plastic flange and the face of the housing. Any ideas? I tried with the rubber washer front of the thermostat, and the rear of it, but the plastic flange has a raised lip meaning when it tightens it doesn't press flat against the housing because of the rubber washer.

 

Method 2 i tried was to come by the raised lip issue, to just put the rear rubber washer on then coat the front of the plastic flange and lip with hylomar, that seemed to fix it until there was pressure in the top radiator hose and now find it leaking again. Such a simple thing...Any ideas?

Edited November 10, 2014 by surferkid205

[Tom Fenton 1,541]

The mi stat uses a different kind of rubber seal- like a small U shape that goes round the lip of the stat. The flat rubbers are for the 8v with alloy stat cover.

[jord294 92]

From my experience of 16v engine, the correct seal actually sits over the edge of the thermostat. Not 2 seperate seals back and front.

 

Have you definitely got the right thermostat cap?

[yorkshirekowboy 19 1 Cars]

Well, I changed the thermostat housing to another one, just looked and my old working thermostat sits firmly in the housing. My new one I replaced it with the thermostat is a sloppy fit, as though the new one I've put on has a bigger hole compared to the old one. Thinking the wrap around lip rubber gasket would cure this, but my new thermostat plastic flange may be wrong. I'm thinking my new housing is from a bx 16v which I would of thought would be the same?? I thought they were all the same. Does that mean the x2 outlet plastic flange I've bought is wrong and that's there is x2 types of them?

[Anthony 1,003]

As you've found, there's two types of housing - one which uses a seal each side of the 'stat, and one which uses a single seal that the 'stat sits inside.

 

The thermostat takeoffs are different for the two types, differing by the diameter of the part that sits inside the housing.

[yorkshirekowboy 19 1 Cars]

Man this is hard work ha, well I will try gsf for some parts . Cheers

[yorkshirekowboy 19 1 Cars]

Anybody know what the part number is for the thermostat is with the U shapped rubber lip around. Euro car parts and gsf they Arnt listed. Oh I'm using the rear water pipe aswell. Unsuccessfully trying to find the x2 plastic outlet for what suits it aswell.

[Anthony 1,003]

Thermostat itself is the same, it's the seal that differs. Most thermostat "kits" come with both seals in the box.

 

I probably have a spare outlet for the later type thermostat housing with the larger diameter if you need one.

[yorkshirekowboy 19 1 Cars]

Right well I will have to try and get a seal. Also I would be interested in your outlet. Is it new? Where are they purchased from as I don't think Peugeot do them?

[welshpug 1,657]

have you checked with a decent parts man? as they are not marked NFP.

[yorkshirekowboy 19 1 Cars]

Are you looking on the Citroen parts as I'm think my later type housing is from a bx??

[welshpug 1,657]

bx only used the later of the two part numbers listed.

[yorkshirekowboy 19 1 Cars]

Do you have the dealer part number there for the later housing flange that's Anthony was talking about I need to get this issue finished and car working. Never realised when I bought my new plastic flange it was smaller than the part I need. Didn't even know there was any difference. Gather I'm ok in using my old 8v thermostat even when I'm using the rear metal pipe.

[yorkshirekowboy 19 1 Cars]

Got it, 1336.88

[jord294 92]

Got it, 1336.88

 

 

i'd put money on you need 1336.g1 as 1336.88 is also suitable for phase 2 8vs

[yorkshirekowboy 19 1 Cars]

You've just lost some money as the 1336.g1 was the one I bought hehe. It's to small for the housing I have, fits perfect in my old one but as I swapped for another one, the flange raised lip is sloppy in the housing. Same as my theremostat but I've just ordered a U snapped type which wraps around the thermostat making it hopefully sit correctly

Edited November 10, 2014 by surferkid205

[jord294 92]

You've just lost some money as the 1336.g1 was the one I bought . It's to small for the housing I have, fits perfect in my old one but as I swapped for another one, the flange raised lip is sloppy in the housing. Same as my theremostat but I've just ordered a U snapped type which wraps around the thermostat making it hopefully sit correctly

 

 

fairy snuff it's just i was having a sort out of new parts and found 2 x 88s and a g1

 

hope you sort it mate

[Anthony 1,003]

i'd put money on you need 1336.g1 as 1336.88 is also suitable for phase 2 8vs

Some late 8v's also have the larger type thermostat housing.

[yorkshirekowboy 19 1 Cars]

Cheers guys, so am I right in thinking the 1336.88 will sort my problem? Also what's the bleed valve on them? It's not the brass Allen headed bolt.

[Anthony 1,003]

Just a plastic screw-on cap normally. Don't really need to use it to bleed the system though,

[yorkshirekowboy 19 1 Cars]

Yeah, it's just like a tyre valve cap I guess. I've managed to get one them outlets now. Thanks for your help .