X300 replacing thermostat
#1
X300 replacing thermostat
As my X300 is running cool even on motorway journeys, I intend to replace the thermostat to see if that's the problem. I'm used to cars having a clearly visible one situated on top of the radiator but on my car this is not the case. I can see a large hose at the front of the engine near to the fan which connects to a housing near the top of the engine block. Is the thermostat in there?
I don't want to dismantle something unnecessarily.
If it is in there, is a gasket replacement necessary at the same time?
Apologies if this appears to some to be a rather simplistic question!
Thanks.
I don't want to dismantle something unnecessarily.
If it is in there, is a gasket replacement necessary at the same time?
Apologies if this appears to some to be a rather simplistic question!
Thanks.
#2
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biffta (03-05-2013)
#4
Be VERY careful when replacing it.
Some parts listing call for a gasket between the cover and the cylinder head, some call for an o/ring.
I have never seen the o/ring style, but I have seen many, many cracked covers from o/ring being fitted to a gasket style cover.
Ensure the groove in the cylinder head is CLEAN prior to refitting the thermostat.
I also use a "dob" of RTV on the new thermostat to keep it in place in the groove, coz if it drops out as the cover is positioned, you possibly will not notice it, and the cover will be cracked when tightened.
Some parts listing call for a gasket between the cover and the cylinder head, some call for an o/ring.
I have never seen the o/ring style, but I have seen many, many cracked covers from o/ring being fitted to a gasket style cover.
Ensure the groove in the cylinder head is CLEAN prior to refitting the thermostat.
I also use a "dob" of RTV on the new thermostat to keep it in place in the groove, coz if it drops out as the cover is positioned, you possibly will not notice it, and the cover will be cracked when tightened.
The following users liked this post:
biffta (03-05-2013)
#6
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#9
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You're closing in on it!
The Part Catalogue diagram makes it clearer:
Attachment 35416
Thermostat (item 4) and Gasket (item3).
Graham
The Part Catalogue diagram makes it clearer:
Attachment 35416
Thermostat (item 4) and Gasket (item3).
Graham
Slightly off topic....
Gasket #8 in the illustration has been known to cause minor (and *hard to trace*) coolant leaks. A few of us have been there, done that over the years.
Just a little tidbit to store away for possible future reference.
Cheers
DD
#10
Thermostat
Hi folks, my original thermostat had a little poppet valve installed in it. The new stat does not. Shall I go to Jaguar and get one with the little valve in it? Will the stat w/o the valve work satisfactorily? For the record, what is the valve designed to do? Thanks much. Rendo.
#11
Rendo,
The poppet is to bleed air, and installed at the 12 o'clock position.
If no poppet, simply drill a small hole, 3/32" diameter is OK, in the outer disc, and is what I did to mine. Install the stat with that hole at 12 o'clock.
If that is not to your liking, return to the supplier and get a poppet stat.
The poppet is to bleed air, and installed at the 12 o'clock position.
If no poppet, simply drill a small hole, 3/32" diameter is OK, in the outer disc, and is what I did to mine. Install the stat with that hole at 12 o'clock.
If that is not to your liking, return to the supplier and get a poppet stat.
#12
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