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[Diamond Black Geezer]

Don't know where, but there's a guide in the How To section for cleaning the breathers. You need to make sure they're all completely clear - it's a job you do 'once but do it right' (though have to do again as preventative maintenance somewhere later down the line of course)

Just be aware that in order to remove the Breather Bridge you need the throttle body off - don't thnk that undoing that single torx you can lever it up and pull out. It will come but at the expense of cracking the breather bridge and causing a slight air leak upon reassembly - air leaks are the enemy of Omega V6 engines! 

The top hat seal is simply a push on-pull-off rubber grommet/seal/washer underneath the breather bridge. 

[05omegav6]

Indeed

Remove the 90° intake ducts, then undo the four torx bolts on the throttle body and simply pull it forward. Be sure to refit the vac hose underneath it when refitting though...

No need to undo the coolant hoses unless you either like spraying coolant everywhere or need to clean it properly 

[gbh]

Any seals or gaskets that will have to be renewed?

[EMD]

Any seals or gaskets that will have to be renewed?

You wont know till its off , but the top hat seal can easily tare if its an old one . O rings can perish , only pence to replace .

[gbh]

But hard to find with no part numbers!

[Andy B]

But hard to find with no part numbers!

The lads behind the parts counter at Vauxhall have access to EPC 

[Diamond Black Geezer]

Given their cost worth getting spares of the lot and fitting 'while you're down there'

My database may be incorrect but here's what I have noted down

Top hat seal 1x 90467543

Small O Rings on breather bridge to Throttle Body 2x 90500983

Can't find the part number for the 6 x larger O rings that sit between plenum and divider. Have a brand new bag of them spare at home, will look when I get home or have a dig around here:

http://www.partsbase.org/opel/omega-b-1994-2003/ 

[gbh]

Hi all,trying to remove top hat for cleaning and don't want to brake anything,I've removed 4 torx bolts and two torx screws and everything seems loose but pulling forward there is resistance.The carb seems loose but isn't pulling forward easily??Thanks Glenn

[gbh]

All sorted so at least that's clean now to the rocker cover gaskets!!!!!

[gbh]

Rocker cover gaskets required now which and where and what price any help on this?Thanks