V8V Thermostat change
Discussion
Had my V8V since Feb and done 15K miles in it so far this year. I noticed the temp gauge was not getting up to 50% when on a long journey - sometimes it would only get up to 25% if that. It would get to 50% in standing traffic, but not on a run.
Searching this forum (thanks all who contributed) clearly showed the issue to be the thermostat. So I got a replacement and fitted a new one. I thought some of the more technical of you might appreciate the pics of what was wrong with the thermostat and what the replacement looked like.
So, here is what the duff one looked like once I opened up the thermostat housing (note the deformed seal):
Here is what it should have looked like (having just fitted the new one):
Reassembling and testing now gets me normal engine running temps - so I am a happy chappy.
Well, almost. I also decided to clean the throttle housing and managed to break the inlet hose retaining band! So its currently held on with a pair of large tie wraps until I can get a replacement. Doh! and it looked so easy when I watched Rick doing it on the video from his web site. Sigh.
Searching this forum (thanks all who contributed) clearly showed the issue to be the thermostat. So I got a replacement and fitted a new one. I thought some of the more technical of you might appreciate the pics of what was wrong with the thermostat and what the replacement looked like.
So, here is what the duff one looked like once I opened up the thermostat housing (note the deformed seal):
Here is what it should have looked like (having just fitted the new one):
Reassembling and testing now gets me normal engine running temps - so I am a happy chappy.
Well, almost. I also decided to clean the throttle housing and managed to break the inlet hose retaining band! So its currently held on with a pair of large tie wraps until I can get a replacement. Doh! and it looked so easy when I watched Rick doing it on the video from his web site. Sigh.
tonyarmitstead said:
Well, almost. I also decided to clean the throttle housing and managed to break the inlet hose retaining band! So its currently held on with a pair of large tie wraps until I can get a replacement. Doh! and it looked so easy when I watched Rick doing it on the video from his web site. Sigh.
Congrats on the fix, and that's exactly the reason I haven't tried to clean my own throttle housing! Although I'd probably break things in a far worse way.Nice pics, thanks!!
I have an idea the same happened to me last night on the way back home from Munich to Geneva on my 2006 V8V just as 29,000km flashed up. Just happened to give the dials a glance as I noticed the 29k come up and oopss!!
all of a sudden the temp gauge was sitting at about 7pm instead of the usual rock-solid 9pm.
Did you need to drain the system to fit the thermostat? I might just get a new one myself and have a go.
I have an idea the same happened to me last night on the way back home from Munich to Geneva on my 2006 V8V just as 29,000km flashed up. Just happened to give the dials a glance as I noticed the 29k come up and oopss!!
all of a sudden the temp gauge was sitting at about 7pm instead of the usual rock-solid 9pm. Did you need to drain the system to fit the thermostat? I might just get a new one myself and have a go.
The official instructions are to drain the system - but that means taking the front under tray off so you can get to the drain plug. So I didnt bother and just let all the coolant p**s out when I dismantled the thermostat housing. This does mean you need to wash off the engine and the rest of the engine compartment and tray after doing the job - otherwise you will get the nasty smell of antifreeze for ages after doing the job.
The thermostat comes in 4 pieces and it is not obvious how they all fit together until you take the old one out and then it is obvious. You will need the thermostat and a new seal.
The thermostat comes in 4 pieces and it is not obvious how they all fit together until you take the old one out and then it is obvious. You will need the thermostat and a new seal.
tonyarmitstead said:
The official instructions are to drain the system - but that means taking the front under tray off so you can get to the drain plug. So I didnt bother and just let all the coolant p**s out when I dismantled the thermostat housing. This does mean you need to wash off the engine and the rest of the engine compartment and tray after doing the job - otherwise you will get the nasty smell of antifreeze for ages after doing the job.
The thermostat comes in 4 pieces and it is not obvious how they all fit together until you take the old one out and then it is obvious. You will need the thermostat and a new seal.
I am always in favour of the simple approach!! Avoids the half-an-hour "dropped the drain plug down the drain" faff as well...The thermostat comes in 4 pieces and it is not obvious how they all fit together until you take the old one out and then it is obvious. You will need the thermostat and a new seal.
Vergis said:
Glad you mentioned this. I have a similiar issue so will probably need to change the thermostat over as well. Nice find on the Jaguar part.
Could you point out where in the engine bay this sits?
On pretty much any car, the conventional layout of the cooling system, dictates that if you follow the TOP hose from the radiator, it terminates at the thermostat housing, which in turn contains said thermostatCould you point out where in the engine bay this sits?
Yes they were a bad design. As you can see in the photo above the rubber O ring comes away from the plunger and hence doesn't seal when closed. The ones they sell now have been redesigned such that this separation won't happen. Should have been a recall in my eyes, very poor just letting their customers discover this for themselves.
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