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[terry paget]

X84GNB
Having struggled over six weeks to change my RH exhaust manifold, I now have a blowing exhaust and a water leak from the back of the cylinder head.

Amba warned to ensure that the O ring in the coolant transfer pipe remained in place as I struggled to insert the locating screws. I thought I had done so.  I certainly have a water leak from the back of the head.

I wonder if I was sold the wrong O ring. I learned later that the part number of the ring I used was that of the thermostat transfer pipe O ring. Are they the same?

[amba]

I cant remember if the 0 rings were the same as I did lots of other jobs whilst I had it apart.

Found the original receipt and part number for Rear Transfer seal 0 ring was 90499289 although when I bought new thermostat I also got the thermsoat pipe along with both pipe 0 rings and thermostat seal included.

If the leak is fairly constant from back of engine my money is on the seal actually falling out on assembly or becomimg dislodged and not performing its job.

I hate saying it but you need to get it all apart again  to check seal,but part number of 90499289 is the correct one 

[terry paget]

I cant remember if the 0 rings were the same as I did lots of other jobs whilst I had it apart.

Found the original receipt and part number for Rear Transfer seal 0 ring was 90499289 although when I bought new thermostat I also got the thermsoat pipe along with both pipe 0 rings and thermostat seal included.

If the leak is fairly constant from back of engine my money is on the seal actually falling out on assembly or becomimg dislodged and not performing its job.

I hate saying it but you need to get it all apart again  to check seal,but part number of 90499289 is the correct one 

Thanks. the O ring I fitted was part no. 9128362. It was just my bad luck that the silly thing fitted in the groove. I guess it was too skinny to do any sealing. I bet it's still there. Now I have to do the whole job again.

[amba]

Sorry mate ,but think you have fitted.(or been supplied) with the seal for the thermostat housing.

Part number is correct for transfer pipe seal.90499289..well it was on my parts list and mine been watertight since I did it around 15 months ago.

On a slighlty more positive note you now know what bits need to come off and how to get on them with sockets so shouldnt take too long this time.

Plenty of grease to hold seal in place

[terry paget]

Thanks Amba. I am already stripped back down to the coolant bridge, as you say, it's easy when you have just done it. Also I believe I can remove the coolant pipe without removing the oil filter and the oil pipes. I shall find out. First thing to do is get the right O ring and some more cooler bridge seals.

[terry paget]

I cant remember if the 0 rings were the same as I did lots of other jobs whilst I had it apart.

Found the original receipt and part number for Rear Transfer seal 0 ring was 90499289 although when I bought new thermostat I also got the thermsoat pipe along with both pipe 0 rings and thermostat seal included.

If the leak is fairly constant from back of engine my money is on the seal actually falling out on assembly or becomimg dislodged and not performing its job.

I hate saying it but you need to get it all apart again  to check seal,but part number of 90499289 is the correct one 

Hi Amba. Have just been to Downside Motors to order transfer pipe seal 80499289, and was told that number was the exhaust manifold to downpipe gasket. From his exploded diagram the part I want is the same part as the thermostat pipe O ring.  I have two more of those. It is certainly the same diameter, but is an O ring, whereas the washer that came out was flat. Could you check your old invoice number?

[razzo]

might be an idea smear some vx grey sealant or loctite 5699 around the joint to keep the o ring in place during assembly & help the joint seal better

[amba]

Sorry Terry,old eyes are not what they used to be    and just read down the invioce as ordered lots of parts and the downpipe gasket was the one below.

Part off invoice is ....Coolant pipe O-ring                 9128362           

Agrre with razzo about applying an extra bit of sealant.From my memory I think I actually stuck the O ring seal in with a bit of oil cooler plate sealant as had also replaced that and the thermostat at the same time so had it to hand.

Sorry again for the misleading info however that seal is the part I used

[amba]

Just done a bit more searching and it is the same part number as the thermostat O ring seal so atleast you have the correct part .I never needed to order the stat seal as it came with the thermostat unit so they never got put together .

When I removed the transfer pipe the original O ring was no more than a very thin flat peice of almost rigid rubber so imagine it gets pretty hot and squashed so think your description is about right.

For total safety might be wise putting some sealant around the edge as belt,n,braces as you dont want to be taking it all apart for the 3rd time.

Good luck with it

[terry paget]

Thanks Razzo and Amba for excellent advice. I measured the old washer - by now a flat washer - and the new O ring, and in cross section area they were the same. So I guess my O ring must have fallen out, as Amba warned it might.

I will let you know if the O ring is still around, but I doubt it.