Hi, The plug on my thermostat housing has started to leak. I need a O-Ring with an internal diameter of 7.5mm, a cross section of 3.5mm. I've looked everywhere and you can only seem to buy these in bulk. I only need one, has anyone on here been able to find this washer in a shop?

 

Have you tried ford?

 

yup, he brought up some schematics on his computer and told me I can't get them singly, Id have to buy a whole new housing. The guy was really honest and said its just ford trying to make more money

 

Strange, when I replaced mine on my old st170, I just bought a new plug and seal!

 

its really annoying, I can see the problem and its a 15p O-Ring. The best i can find is a company with a £10 minimum spend... hmmmm what £9.85 of crap can I get.

 

did you get your o-ring and plug?
i have same problem and am going to try my local ford garage tomorow

 

Nope still looking, the local ford garage told me I'd have to buy the whole unit, so it was best for me to try scrap yards and such.
Let me know if you have any luck

 

Do you know what size o-ring you need? I can have a look at work and see if i can find anything?

 

and me...... im now due for another so i will enquire and let you know if they are available in singles and the part numbers

 

Cheers, on both accounts, I cant remember the size but I think its 7.5x3.5mm ish
BS203V75 on polymax.co.uk

 

just been down to my local ford garage and ordered a new plug for £7.50
the ford FINIS no is- 1150991
hope this helps.
it should be here today if not tomorow

 

Why did my local garage tell me its not available grrr
Thanks for the FINIS nbr, Ill try again at the weekend

 

any luck with ford?
replaced mine today 10 min job i found it easier going in from underneath as not mutch room from top

 

abit of PTFE tape does the job

 

half of these leaks you just need to put some good adhesive sealent. every1 fucking panics and gets a new thermostat housing. mine was leaking very slowly, we whipped it off and put some adhesive sealant on where metal part is where it moves. fine now

and fuck knows where that geezer got that from, you cant just replace that o-ring, it comes built in to the housing????????????????? you need whole thermostat housing.

just sealllllllll it

 

Normally because the shitty plastic thermostat housing cracks!

 

You can buy the small plug that leaks from Ford for £7.50,got one for mine yesterday. You get plug and seal but no spring clip,don't think you need to replace this. Some Ford garages say its not a replacable part and you need to buy a whole new thermostat housing but they are bullshitting,just after more money. Its a common fault to go on st170's but mine's lasted 5years so not that bad,just hope the new one lasts as long. Good luck..