Thermostat housing corrosion 1993 205 1.9 Gentry

[Bremar 2]

Hi, 

I am in process of replacing the inner wing coolant pipe and attached hoses 

With stainless a steel pipe from Baker BM. Having drained the coolant I had a look st the thermostat area. I have attached a YouTube video showing the issue which is simply ( or not) corrosion around that area.
in particular it has a plastic thermostat top housing but,  is the main aluminium bottom housing actually a separate bolt on replaceable unit? So that I can change it Should it have a problem? And if so are there better options

 

 Thank you Bremar. 

[Leslie green 111]

This is what it looks like and it also houses the distributor , there is an allen bolt that can only be accessed when the distributor is removed , it is the final bolt, the dissy is held on by 2 nuts . The aluminium is generally ok , you have a water leak which has caused the corrosion mess ,likely from the thermostat seal . You wont be able to buy the big allow block  new but nor should you need too . You can see how it mounts with the pic below , the bolts holes and also the allen bolt location behind the dissy when it's removed in a recess , mine is earlier with metal thermostat cap but otherwise they may well be the same . There is a gasket to the engine called " thermostat housing gasket " but later cars like your they just used instant gasket although its easier with a gasket .

 

https://www.miamistu.co.uk/pug/GB/205N/1/13E52A.HTM

 

 

Edited October 21 by Leslie green

[Bremar 2]

Ok that explains it and with the parts diagram I can see if there turns out to be an issue with the aluminium housing it wont be to difficult to resolve. 
I removed the plastic top housing to the thermostat and was surprised that there wasn’t a paper gasket as well as the rubber gasket that goes around the outer rim of the thermostat. I think I might add something even if it’s just an instant gasket seal on the edge of the aluminium. 
i will try order a new 82 degree thermostat tomorrow. But bet they are all chinese now. 
thanks again Leslie really appreciate 

Brett 

 

[welshpug 1,661]

Don't bodge it, the standard rubber seal is enough.

[pug_ham 244 3 Cars]

A said by Mei, the standard rubber seal is sufficient to give a good enough seal without any gasket sealant under the cap.

 

Because you have the later plastic cap, the new thermostat could come with three seals, two of the earlier type which go either side of the thermostat & one of the later which sits around the thermostat, like your old one did.

 

g

[Leslie green 111]

I did see someone on ebay selling a paper gasket for the thermostat ,mine is the earlier metal outlet type  but if the seal that goes round the thermostat I bought is all that's needed happy days . I had a thermostat with the 2 seals that go top and bottom but they didn't really seem to locate anywhere properly so bought the later type.

Edited October 22 by Leslie green

[welshpug 1,661]

Paper gasket isnt for the XU.

[Leslie green 111]

2 hours ago, welshpug said:

Paper gasket isnt for the XU.

It was listed for gti and does fit but if its not needed I won't fit it cheers.

[Bremar 2]

1. I think I found the paper gasket that would fit but as rejected by other respected contributors, that may not be a good idea because, and this is my thinking, it may hold off the compression of the rubber gasket that surrounds the parameter of the thermostat. However, given that mine appears to have weeped over the years, causing corrosion in the area, surely some dedicated RTV gasket cement in the same area (see picture for reference) would be beneficial and wouldn’t effect the compression of the rubber gasket. A sort of belt and bracers job. 
2. I am finding it hard to find a Peugeot 205 specialist supplier for all parts Peugeot in the Uk. I bought coolant hoses etc from Baker BM but searching the website couldn’t find a thermostat. I hate searching ebay and ending up with rubbish, when often specialists have already sourced a good reliable make of eg thermostat. Price isn't the issue it’s more about quality. Maybe I’ve missed something but any pointers to such specialists. 
once again thank you for any experience or other advise 

Bremar. 

[welshpug 1,661]

i got a thermostat off the shelf at a local motorfactor.

[Bremar 2]

Well yes, I bought this off ebay in the end. Couldn’t find any recommended ones/makes for the 205 anywhere on the internet. No idea as to equality but it looks and fits ok. And was the correct 82 deg.C  replacement for the original.  £8.53. 

Edited October 25 by Bremar

[Leslie green 111]

Looks exactly the same as one I bought