Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: bighed on 14 December 2008, 12:02:41
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Right guys, I have finally plucked up the courage to have a go at my blowing exhaust manifold that has finally done my head in.
I cant find a how 2 anywhere so any guidance/tips would be brilliant. :y
Gonna have a pop at it next sunday. Luckily my friend owns a truck rental business so will be using his lovely warm workshop.
Least if it takes longer I can go home in a truck ;D
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i've done this last year,only to find a broken stud in the head,but it came out with a pair of vice grips,did it on the car,bit of a nightmare but got it done in a couple of hours :)
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Oh dear. Dont sound good mate, :'(
Any tips?
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I to have the same problem, looking for a little advice on this one! Broken studs, ooohh sounds like a job for the garage.
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hi guys i have not tried this yet ?
anyway i have been talking to a man who works for vauxhall and he said that the snapped studs are very common .
he advised me to try get a nut on the side of the head where the stud was and weld thebhole in the nut full so it bonds with the broken stud then turn the nut and it should start to un do , might need a few attempts
he told me this after i had taken the head of mine to drill them out
hope this helps in any way :y
like i say i have not tryed this yet !!!!
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The weld a nut thing was a regular fixit for me years ago when in the Merchant Navy, particularly where studs had corroded. The welding action and subsequent cooling normally assisted in breaking the threads and allowing the broken stud to be removed.
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Oh right ok. So might as well change the gasket while its all off then
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Is there a good chance it is the manifold stud as if so I will get a couple from vx or can someone suggest a size that would fit please? :y
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standard 8mm studs bud ! :y
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By studs do you mean bolts? If so how long and do they need washers?? :y
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By studs do you mean bolts? If so how long and do they need washers?? :y
no by studs i mean studs ! like a piece of threaded bar ! iirc they are 40mm long and you need nuts with built in washers also they are locknuts not nylocs :y
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Can these be got from vx then i take it?
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Can these be got from vx then i take it?
yep :y
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atleast it's the drivers side (looks easier to get at-after having a go at doing the passenger side and taking the whole ac compressor and pas pump off!)
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Do I need to disturb the cam cover gaskets or do I not need to go that far down??
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its lower than cam covers bud ! if your not sure what your doing i would suggest you get someone else to do it its a quite involved job not for the faint hearted say :-/ :-/
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Did cam covers with my mate who is a transit mechanic. Right so will need more vx black sealant then
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Did cam covers with my mate who is a transit mechanic. Right so will need more vx black sealant then
no mate you dont need to take cam covers off ! have you got a haynes manual ???? :-?
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Yeah realise got to take cam covers off again :y
Will these need replacing with new vx ones again as only rpelaced them about 3 months ago mark :-?
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Sorry for all the questions btw :-[
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Yeah realise got to take cam covers off again :y
Will these need replacing with new vx ones again as only rpelaced them about 3 months ago mark :-?
no mate you do not need to remove cam covers !!! :y
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Only gaskets you will need are:
Manifold to head gasket (vx multi plate steel job)
Manifold to front pipe gasket
Coolant pipe to rear block seal.
I ahve seen one or two cracked manifolds but, this is far rarer than on the 4 pot and its VERy rare to see snapped studs on the V6
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Only gaskets you will need are:
Manifold to head gasket (vx multi plate steel job)
Manifold to front pipe gasket
Coolant pipe to rear block seal.
I ahve seen one or two cracked manifolds but, this is far rarer than on the 4 pot and its VERy rare to see snapped studs on the V6
OOOO we must be special ;D
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Have only got the actual exhaust manifold gasket.
The Manifold to front pipe gasket & Coolant pipe to rear block seal??
Are these the actual names for these parts??
:y :y :y
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Marks DTM Calib. Have you done this before? Whats the best way to attack the job? :y
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Here are the notes I collated before I did the job on mine:
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Post 98 models should have the non-seize manifold nuts fitted
Drop the front pipe off of the manifold (two bolts accessed from under the car)
Remove the plenum and intake assembly.
Remove the scuttle cover.
Drain the coolant.
Disconnect the main stainless steel coolant pipe that runs around the drivers side head at the rear of the block (two bolts, you need to lean over the engine to reach) and remove it.
Removing the coolant pipe from the block isn't that easy - you need a long E10 socket to get past the oil pipes (and a lot of patience).
Remove the manifold heat shields. There is an extra e10 bolt on the inside of the manifold at the rear – you may find that these will shear off!!!
You also need to remove the heat shield from the exhaust manifold. The lower heat shield usually comes off with ease (only 2 or 3 E10's)
Unbolt the manifold.
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Manifold nuts are locking nuts - when new they are oval at the ends - if you get new ones make sure they give you 13mm nuts - 2.6 & 3.2 went to 10mm nuts not as good.
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Part no. Price
Exhaust downpipe nuts M10 x 2 90570845 approx £1.50 each (have helicoil insert)
Manifold gasket 24416110 £5.91
Manifold nuts x 7 11082413 £0.26 each
Manifold studs x 7 90106924 £0.45 each
Coolant pipe O-ring 9128362 £1.46
Front pipe gasket 90499289 £4.55 each (rip off)
Secondary Air Injection gaskets x 2 90467427 £0.40 each
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By MarkDTM
My approach to this job is.
Drain the coolant
Jack the car up and remove the two front pipe to manifold nuts (should be easy on yours as it uses the later helicoiled nuts) and remove the bolt that secures the front pipe to the gearbox bracket. Pop the front pipe of the manifold studs (takes a bit of wiggling and sometimes requires a foot on the centre section silencer to get it off) and then tie the front pipe to th gearbox to give it some support before putting the car back on the floor.
Strip the inlet manifolds off and place to one side, no need to remove the lower manifold for this job (which saves th pain or removing 12 thread locked bolts!).
Now disconnect the pipes to the heater matrix assembly (fast fit conenctors, press the tabs and slide the collar back, twist the connectors a few time to free them off), disconnect the vaccum pipe that goes to the bypass valve and disconnect the pipes that attach to the coolant bridge and main coolant pipe. Now remove the bypass valve and all its associated pipe work.
This gives a nice amount of space to work in.
Removal of the header tank (again easy) gives more room to work in.
Disconnect the main radiator to coolant pipe hose at the front left of the engine and disconnect the air injection rubber coupling on the left side of the engine.
Remove the bolt on the 1-3-5 bank lifting eye that secures the coolant pipe to the negin and then remove the lifting eye (single bolt again)
Now, using a short extension on a ratchet, remove the two torx bolts (think there e12 but could be wrong) that secure the coolant pipe to the back of the block, for the right hand one you might have to ease the oil cooler pipes out the way a little.
The coolant pipe should now come out (honestly, it does, takes a bit of manouvering!).
Now spray all the heatshield bolts with penetrating fluid and go and have a cuppa.
Now remove the heat shields starting with the upper one, then the air injection pipe and finaly the lower one remembering that there is a securing bolt right at the rear of the manifold to the right of the downpipe connection.
Now pop the manifold off, again shouldn't be an issue given the age of the engine as again it has the later studs.
Clean the head face well and check the manifold carefuly for cracks (it seems to be only the Police that manage to crack them from my experience) before cleaning the face of it and checking its flat, I use a belt sander to flatten them off a bit (makes cleaning easier to). I also use a tap and die to clean all the threads up.
Then re-assembly is reverse of removal, I use a small wipe of silicon (cam cover sealent or similar) on the rubber O ring for the coolant pipe just to hold it safely in place when re-fiting.
You also want to clean the rear block mating surface before re-fitting the pipe....
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That is ABSOLUTELY AWESOME!!!!!!!!!!!!!!!!!!!
Thanks to both, It will come in very very usefull!
Prices have gone up considerably since tho :'(
And the weekend fix idea is out the window as VX cant get parts till Monday :'( :'(
Looks like its just track rod end now then :y