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[kcl]

I have asked this before but got no answers, so sorry for repeating myself but I'd really like to know the difference and local dealer won't help me.

So, the question is: what is the difference between the two different tranfer pipe o-rings? It seems to be related to newer type of thermostat but I can not confirm that neither. And, fact being that the pipe is the same so I'd assume that o-rings can not be of different size (grooves on pipe limit the thickness). Is the difference only the material? Or what?

[freecall666]

you will find them in an O-ring kit few £ here.

[Elite Pete]

I've only ever come across 1 set of O rings for the thermostat coolant transfer pipe but the O ring for the coolant transfer pipe that leads from the back of the block to the rad has a different O ring

[kcl]

Thanks for the replies but the problem still exists. Waht is the difference between these two
13 90410899 13 38 471 SEAL, RING  (E)
(E)  -08378122
      -14393646
2 

13 9129999 13 38 202 SEAL, RING 
(E) 08378123-
(E) 14393647-
2

[Darth Loo-knee]

The Transfer Pipe which pushs into the Thermostat has two O rings on the end that are the same on all V6's.
The Thermostats changed to a thinner body wall where the bolts go through so you will need shorter bolts.
There is two different types of profiles of Thermostat O ring. one is round in profile the other is square.

Other than that mate not sure what your refering too I'm afraid

[kcl]

The Transfer Pipe which pushs into the Thermostat has two O rings on the end that are the same on all V6's.
The Thermostats changed to a thinner body wall where the bolts go through so you will need shorter bolts.
There is two different types of profiles of Thermostat O ring. one is round in profile the other is square.
Other than that mate not sure what your refering too I'm afraid

This answers my question  So, the profile has changed from square to round. Thanks. Now I can sleep better 

Reason I ask is that I STILL have a very minor water leak and can not find the reason. Have replaced the stat and re-sealed once (just in case) it after replacement, re-sealed oil cooler (was leaking somewhere between the heads/in the V), replaced HBV. All hoses seem to be ok, all genuine sealants, gaskets and parts. Can only see some coolant drops on the oil filter housing, other than that the engine and engine bay is dry and clean. After re-sealing the oil cooler had it 100% leak free for a month or two, now it has started again but not as bad as it was. I'm getting quite fed up with this and can really not find the leak. Plenum has not been off since so can not say for sure its not the cooler again but really, how probable is that? Not, IMHO. So, I guess it leaves the possibility of head gasket leaking to the outside but can it?

[Darth Loo-knee]

If i were doing the oil cooler plate, after using the grey sealer I would leave the sealer overnight to go off before putting water in or starting.
A little grey sealer around the thermostat seal is a good move..
As for your head gasket if you car is a 2.6 or 3.2 its unlikely. 3.0's around 1998 seem to have issues on the passenger side rear of the head. No point changing just one head though.

[Kevin Wood]

I would remove the plenum, intake manifold and intake divider, then pressurise the cooling system to 1 BAR using either a pressure tester or just connect one of the (now disconnected)  throttle body heat hoses to an airline and block the other one.

Then watch where the leak comes from.

A leak from the oil cooler will be obvious, as will one from the thermostat housing-to-block interface. If it's the transfer pipe to thermostat housing, it will probably appear on the lip of the sump just to the right of the crank pulley. Water pump leaks will emerge here too. How do I know? I had a leak following a thermostat change too, and it turned out to be a poor quality seal on a pattern water pump.

If it looks like the water pump, you need to remove the cam belt cover to be sure.

[dbug]

If you have problems sealing oil cooler plate with the Vx grey sealant make youself a gasket - works 100% every time

As DLK says above if you use grey sealant only allow at least 24 hours for it to set (depending on ambient temp!!) before ading coolant!!

[kcl]

Thanks again. The grey goo was left overnight, in fact I recall it stood for two days. No coolant drops on the oil pan lip so it should not be water pump, nor the stat transfer pipe. Will have to strip the intake (again  ) and do the recommended pressure test. So, with 1 bar pressure I should see some bubbles coming from where the leak is?

How is the leak from cooler or stat obvious? Both will leak between the heads and in both cases there would be coolant around the area, running towards the rear of engine as the engine is slightly tilted backwards  And, I only have seen a few drops of coolant on oil filter housing, no coolant on other side of engine, that's why I thought it would be head gasket on left head....