Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Webby the Bear on 05 July 2022, 17:56:33
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Word men. Hope u r all good.
2.5 v6. Owned this car for many years now. Know it like the back of my hand. When on motorway it sits exactly at 90 degrees. Maybe touch under.
Round town and traffic etc. it creeps up to 95. Fans kick in. Down to 85. It then creeps up to 95. Fans cut in. And repeat.
Now a few times around town it’s creeping up to 105. Fans cut in and it doesn’t go in the red.
Obviously the fans work. However am i right that there are two can switches.. one for standard fan speed and one for omg about to explode speed. I’m guessing the standard speed one is playing up.
So 2 questions… 1.) which is the fan switch that I need to replace and 2.) is there any other possibilities?
No coolant loss or anything odd other than this 👍
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*fan switches, not ‘can’ switches ;D
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I think you'll find one switch does both fans. It's in the radiator, next to the N/S headlight.
I'd change it and see if the symptoms change. New ones usually have the one and off temperatures marked on them.
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Oh looke here, he might have the fans..
https://www.omegaowners.com/forum/index.php?topic=149287.0
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Lovingly auto-translooted from a German thread I was perchance reading the other evening;
The S88 sits at the top of the radiator and the S128 at the bottom.
The S128 is the first stage (95°C/90°C) and the emergency shutdown air conditioning (120°C/115°C)
The S88 with the second (100°C/95°C) and the third (110°C/105°C) stage.
The cross-flow pump (M54) of the trailing cooling, sits on the newer V6 engines, on the upper left side of the radiator. It ensures coolant circulation after turning off the hot/overheated engine. This prevents steam bubbles from forming in the coolant circuit at hotspots in the head, which would push the coolant out of the head. It is switched directly via Ignition Plus (KL.15) and runs whenever the ignition is switched on.
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Thanks men. So it’s the one at top of rad just under (I think) the top hose?
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… if anyone knows part number that would be brilliant 👍👍👍👍
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… if anyone knows part number that would be brilliant 👍👍👍👍
I got these 2 both for the 2.6 though, so 2.5 maybe different:
90376209
90458540
Just listed for Omega, no engine listed so maybe the same:
https://vauxhall.catalogs-parts.com/#{client:1;page:part;lang:en;category:car;catalog:v94;group:p;groupsub:1;subgroup:39-2}
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Thanks grifter. I’ll have a butchers tonight. Though it has come to my attention I’ve got a large oil leak now 😩😩😩
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Oh ffs. 🤣 does anyone know where I can get v6 cam covers?
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That is to say new ones that aren’t warped 😢😢😢
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Oh ffs. 🤣 does anyone know where I can get v6 cam covers?
Someone can confirm for certain but I'm sure it was another model that had the metal covers, the vectra or another one.
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Oh ffs. 🤣 does anyone know where I can get v6 cam covers?
Do not fit Metal Vectra covers..
Also are you sure yours are wharped,,
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There are I believe two different top switches[what models each fits I don't know]one has a two pin connector and the other has a three pin connector. I have the problem where the fans[all three]kick in at the same time and don't turn off again until after the engine has been shut off :-\
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Oh ffs. 🤣 does anyone know where I can get v6 cam covers?
Do not fit Metal Vectra covers..
Also are you sure yours are wharped,,
Yeah positive mate. I fitted them with new gaskets and thought “ah, they’ll be alright with a bit of extra poo”. They weren’t 😢😢😢
What do u think I should do? I suppose my only other option is to get some second hand, probably also warped ones 🤦♂️
I rang factors. Nothing. I rang Vauxhall. One in Germany and other not available. And both 185 plus vat each. 😢😢😢😢😢😢
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These any good? 2.5 not 2.6, so not sure if they'll wok.
https://www.ebay.co.uk/itm/114933074346?chn=ps&norover=1&mkevt=1&mkrid=7101533165274578&mkcid=2&itemid=114933074346&targetid=4585169652812019&device=c&mktype=&googleloc=&poi=&campaignid=412354547&mkgroupid=1305120599331881&rlsatarget=pla-4585169652812019&abcId=9300541&merchantid=87779&msclkid=40192ed8ede01f8ac2d54c1fe4f83016 (https://www.ebay.co.uk/itm/114933074346?chn=ps&norover=1&mkevt=1&mkrid=7101533165274578&mkcid=2&itemid=114933074346&targetid=4585169652812019&device=c&mktype=&googleloc=&poi=&campaignid=412354547&mkgroupid=1305120599331881&rlsatarget=pla-4585169652812019&abcId=9300541&merchantid=87779&msclkid=40192ed8ede01f8ac2d54c1fe4f83016)
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I'm pretty sure the 2.5/3.0 covers won't fit the 2.6/3.2 as the 2.5/3.0 ones have round holes for the plug leads[having a single coil pack on the back of the engine]where the 2.6/3.2 have square holes with adjacent tapped holes for their coil on plug packs?
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I'm pretty sure the 2.5/3.0 covers won't fit the 2.6/3.2 as the 2.5/3.0 ones have round holes for the plug leads[having a single coil pack on the back of the engine]where the 2.6/3.2 have square holes with adjacent tapped holes for their coil on plug packs?
I wasn't sure, but I think you're right. :y
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I'm pretty sure the 2.5/3.0 covers won't fit the 2.6/3.2 as the 2.5/3.0 ones have round holes for the plug leads[having a single coil pack on the back of the engine]where the 2.6/3.2 have square holes with adjacent tapped holes for their coil on plug packs?
face-lift cars all had the later covers. In part because the US got the 3.0 as a DBW engine unti the end of the Catera run. ;)
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My facelift 3.0 had the covers with the round holes which I had to replace because they were warped I bought some used ones off a member on here which were off a dbw engine but I don't think you could do the swap the other way round.I've not clicked on the link so don't know the shape of the plug holes in those.
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IMV, the elephant in the room is that the rocker cover should be in slight vacuum from the breather to the inlet manifold. I suspect what really happens is that the engines are old and the rings are allowing excessive blow by, and at high power this pressurises the crank case and lifts the rocker cover seals, allowing oil to seep/blow out. If the rocker were in vacuum, that wouldn't happen.
I've also heard it said that replacing the rocker covers with metal ones can cause the crank seal to start leaking. Again that can only happen if the crank case is under pressure, and the only place for positive pressure to come from is piston blow by. If the breathers can't cope with the amount of blow-by, then you are going to end up with a pressurised rocker cover, crank case and sump. Reinforcing the rocker covers with metal ones gives those seals enough strength to retain the pressure, so the next weakest thing lets go (the crank seal).
So yes it is important to make sure the breathers are clean, but IMHO that isn't the root cause of the warped/leaking rocker cover issue. Engine wear is. Unfortunatley the only way to know for sure is a complete engine strip down and cylinder bore/piston/ring work. Difficult to justify on a sub £1000 car.
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Thanks all for the replies. LC, to be honest I’m with u on that. I was suspecting maybe issue with the breather box or something like that. But what u have said sounds highly likely.
I will try n source some covers, clean breathers again and see what happens. If it goes again as quick as this then it’s probably curtains which I’ll be super sad about.
And no I wouldn’t put an engine in it. Too much hassle and time. I shall probably get a nice little fiesta, hopefully one without the rack / column bearing gone 🤣
Re the omega tho I may give Serek a go. IIRC he had a big bin of mig parts last time I saw him 👍
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Evening men. Not bumping but thought I’d let you know the plan…
So can’t get cam covers anywhere. And the small selection of ones on eBay look just as warped as mine. So got some replacement gaskets and gonna do couple of things…. somehow try and either straighten out the covers and maybe brace them in some way. Not sure how this will go but worth a shot.
I’ve then got some hardcore sealant that vag use for their oil pan sealing. Done a couple of seat pans now and this stuff is very good. I happen to have two bottles spare. Gonna put small bead along head to cover mating surfaces in addition to gaskets.
Finally I’m gonna bore holes in to each cover. Poo in a small piece of brake pipe and then washer tube to a catch can cable tied somewhere. The only solution I can think of to relieve pressure if there is any.
I will of course be cleaning breathers again in addition to.
No idea if this is gonna work.
So wish me luck 😃😃😃👍👍👍
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Finally I’m gonna bore holes in to each cover. Poo in a small piece of brake pipe and then washer tube to a catch can cable tied somewhere. The only solution I can think of to relieve pressure if there is any.
I wouldn't do that. IMV better off putting a T piece in the Y pipe that runs from the crank breather to the plenium breather.
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Cheers mate 👍👍👍
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Got it all back together. I took it for half hour run. No leaks…. Yet. Just waiting 🤣
In the end I didn’t drill in to covers cos I got a Topran gasket kit and it looked sooo much better when I compared to the BGA shit that beds. battery sent me. The Topran gasket kit actually stuck in the cover so it wouldn’t fall out so no need to poo 💩 it in. The material was also a nice neoprene type and felt good.
I did however (very carefully) lay a thin bead of poo on the head mating surface. If it leaks within a week now I’ll know there’s definite over pressurising problems and I’ll then make my bores… or T-piece as previously mentioned.