Thermostat Housing Replacement on a 2009 1.4i Pluriel

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My Name: twoceevee

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Posts: 3
Joined: Mon Dec 09, 2019 5:26 pm
Model: C3 Pluriel - with or without roof
Year: 2009 (59)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 60000
Trim Level: Other
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)

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Forum friends,
Does anyone have any advice on changing the thermostat housing on 1 .4i Petrol 8v Pluriel. Daughters' is leaking from where the metal pipe goes into the lower part of the thermostat housing. The Cambelt and Head Gasket were changed earlier in the year by a specialist, so suspect it's just not liked the movement. There seems to be a lot of tight-fitting plastic pipework, and some stiff original fit pipe clips to displace (not the nice screw-head banjos you always see in the youtube videos :-), and just don't want to move or damage anything else. I also note that the replacement part from Euro Car Parts comes with gaskets. Drain or not to drain? Bleeding? Torque settings for the housing bolts? Hand-tight and a bit? Thoughts and guidance welcome.
David.
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My Name: Arfur Dent

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Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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You may have had a drain down of the coolant when the head gasket was done? It's not worth replacing it twice, but well worth replacing if it hasn't been done for a while.

The refilling procedure is here

Everything else like torque settings are in the haynes manual. The pluriel has the same engine as the C3.
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My Name: twoceevee

Member
Posts: 3
Joined: Mon Dec 09, 2019 5:26 pm
Model: C3 Pluriel - with or without roof
Year: 2009 (59)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 60000
Trim Level: Other
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)

Post

So I purchased an OEM Housing (Circoli) which came with gaskets... fitted it, and it leaked coolant from the mating face to the cylinder head...
So I then tried to gently tighten it a little further, and started to split the bolt mount tops, so stopped (oops). Whilst I think there is some "sacrificial meat", I wouldn't want to leave/risk it given the heat it gets subject it to, and the resultant no coolant from a failure, so...

I could re-try with a new part and use a little bit of sealant, or try a Citroen original.

However, I'm told the Original Citroen item doesn't use gaskets, so was wondering the recommended way of getting an assured seal? Gasket Sealant? Or should it just sit flush?

It would be very difficult to use Gasket Sealant without removing the cooling pipe that goes across the back of the engine, as the thermostat housing is quite a tight squeeze to fit between the cylinder head and the mounting for the afforementioned coolant pipe - which would mean removing all of the inlet manifold gubbins for access.

So I'm looking for some knowledge/advice/experience from someone who has actually done this?
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