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1

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:59:24 »

Hi Dave,
Thanks for your help.
I've wasted the last 3 hours work backtracking, but I am satisfied with the solution.
You're right, it seems odd to me too. I've certainly never noticed it before.
Cheers anyway.
Graham

2

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:46:06 »

Hi Dave,

I've presumed that your yellow arrowed pipe connects to the plastic union just to the left of it.
Now I think you don't mean that, but the pipe is just an open ended breather of some type.
Is that correct?

3

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:36:32 »

Hi Dave.
Yes Automatic.

https://photos.app.goo.gl/Wz1fvCWQPLfmcF1D9

another photo showing the pipe in question and what I think is your pipe.

4

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:27:09 »

try this please.

https://photos.app.goo.gl/BvRVYgkWE5R9p6pd8

Graham.

5

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:22:03 »

Hi Dave,

i'll see if I can get the image to work for everyone else.

6

Omega General Help / Re: Mystery pipe- Please help

« on: 16 November 2025, 13:01:14 »

Hi Dave G,
Thanks for the reply. I don't think it's that, I see it on , I think. I need to take the fuel manifold off again, I just can't see.

7

Omega General Help / Mystery pipe- Please help

« on: 16 November 2025, 12:40:50 »

Hi all,

Part way through replacing the oil cooler on a 2003 2.6 DBW Omega.

The usual skinned knuckles and difficulties on areas you don't expect, but generally going fairly well. I will do a fuller report later.

However, I have one problem in that I have a mystery pipe that I don't recall disconnecting and I don't know where it goes! Help please.

It's about a 1/2" rubber pipe. No evidence of a pipe clip, so I don't think its a water pipe.

https://photos.fife.usercontent.google.com/pw/AP1GczPtZYzAQzFBeRvITjc2MyjZp6fjf3njTYIsx8xLgT-idnMiP9mQX-4x-A=w933-h1239-s-no-gm?authuser=0

The pipe with the blue tape.

It is not one of the 4 that attach on the back of the plenum, or the main vac hose with the union that connects onto the plenum, or one of the two coolant pipes that connect onto the throttle body.

I also changed the Heater by-pass valve, but 3 pipes have gone back onto there.

I don't remember a pipe on the fuel manifold.

Any ideas?

8

Newbie Welcome Area / Re: Forum newbie

« on: 03 November 2025, 18:08:34 »

Welcome to the forum.
Never too late to return to the Omega fold.

I've done it twice!

Graham.

9

Omega General Help / Removing Omega scuttle?

« on: 03 November 2025, 18:06:49 »

I think that's the name of it. The thin plastic tray under the wiper arms.

I've got it loose and removed the wiper arms, but there are electric connections (heated jets, I guess) and water connections onto the jets themselves. Do I have to disconnect all the pipes and electric, or does the whole jet assembly just pop out of the scuttle. I don't want to press too hard and break anything.

Any ideas?

Regards,

Graham.

10

Omega General Help / Re: Oil in radiator header tank.

« on: 03 November 2025, 10:42:13 »

Measuring the flat steel washers with the captive rubber/nitrile inner (these are the Dowty washers, yes?) and comparing the size I have with suppliers tables means they are most likely M16.
The rubber only rubber rings that look exactly like flattened O rings I do not have a part number for. (they came with the oil cooler apparently)
I'm not sure if it is a specialist seal, but considering where it is, if I take a gamble and the bloody thing leaks, I'm back where I started.
I note what Doc said about the flat rubber seal being a Dowty washer. Is that a different type of Dowty washer, or are we just lost in translation.

Any help much appreciated!

11

Omega General Help / Re: Oil in radiator header tank.

« on: 02 November 2025, 16:58:32 »

Hi all,

Continuing with this thread that I started a little while ago.
I have not found a UK source for an oil cooler and so today I have removed a cooler from a spare 3.2 engine I have. By definition, a late engine, surely.

Looking back at the pictures posted by James my replacement one looks rather like the older type. It does look S/S though. The GM part number on it is 90572067.
Without any other tenable solutions, I am planning to re-use it, for now.

Looking at the parts I have on the bench I wonder if someone would be kind enough to error check my thinking here: -

Firstly, I have the banjo bolts that secure the metal pipes to the top of the cooler. These have what looks like an aluminium washer above and below the banjo. These are available, but could I re-use these?

Next, I have the pair of "O" rings that seal the cooler against the bottom of the cover plate. These are circa 28mm diameter but are totally flattened. I have no idea about part numbers for these, or if I could use a suitably sized O ring from a multi part (generally pretty cheap) set.

I have some Vauxhall grey sealant.  I can also see from the exploded parts catalogue view that there is thread lock used somewhere in this assembly. Does anyone know where?

Finally, I have what I think are Dowty washers securing the Banjo bolts that go through the coolant bridge. One above and one below, so I need four here again. These are buggered.

Measuring them, they are 23.85 mm OD, 1.6mm thick and approx 16mm ID. It is difficult to tell as they are pretty ragged. The diameter of the banjo bolt is 15.8mm OD, near the shoulder, under the bolt head. I'd have thought that the rubber part of the washer should be a little less than the diameter it is sealing against, but I've not specced any of these before. Any idea which ones to order?

Any other tips or advice would be much appreciated.

Regards,

Graham.

12

Omega General Help / Re: Oil in radiator header tank.

« on: 30 September 2025, 17:30:41 »

Timing is everything and I do need to get the old girl back on the road, so waiting for a delivery from Ukraine is not ideal. I have a spare engine and I'm going to have a practise by removing the oil cooler in that one and replacing mine. Mine is a late car, so should have a S/S cooler, but I don't know if the coolant has been kept in good nick or not. I will have a look at flushing agents to try and remove as much oil as possible. Thank you for confirming that some are Dowty washers, but I'll replace like for like, depending what I find.

Cheers all.

13

Omega General Help / Re: Oil in radiator header tank.

« on: 29 September 2025, 17:55:24 »

Thank you again, that explains it perfectly.

14

Omega General Help / Re: Oil in radiator header tank.

« on: 29 September 2025, 16:57:00 »

Thank you Valentin.

Much appreciated. It looks different to what I expect. I thought they were flat (a bit like an air cleaner element). I've not seem one, just photos.

Graham.

15

Omega General Help / Oil in radiator header tank.

« on: 29 September 2025, 16:27:07 »

Hi all,

I've recently been re-commissioning the Omega after a year or two off the road.

Firstly it runs perfectly. However, I had noticed that it was loosing a little bit of coolant externally before I had parked her up. I did need to put a bit in when I got her going (perhaps one litre) and i ran her up to normal running temperature yesterday, on the drive, until the fans came on and then went off. All seems OK.
However, this morning I notice the header tank is creamy black and obviously has a lot of oil in there. The engine oil level has dropped about 5-10mm, but does not look like there is water in it.
The oil filler has a sheen of mayo in there, but nothing excessive and what I would expect from just an occasional brief run.
Having done a search on here, oil cooler seems a good bet, but I wonder if folks could let me know if this seems sensible considering all the things I have reported here.

Next the question of where I might get a new cooler from? There are not too many, if any available that I have yet found. I take it the part number is the same on all the V engines?

I have a spare engine that was running. Is it a crazy idea to refit a used one?


Does anyone have a oil cooler on the shelf that they didn't end up using?


Regards,
Graham.

p.s. Car is 2003 2.6