Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Vitaliy on 20 August 2010, 20:58:12
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Hi
I am new to this forum, but not to Omega as a car or other manufacturers forums.
I need urgent advice - I got X reg Omega B facelifted V6 2.5.
I just changed water pump and both rocker cover gaskets as spark plugs were swimming in the oil. Car started and run beautifully with healthy sounding engine. I run it in place for 40 min., maybe more. No troubles, good sound, no overheating oil on cam present in sufficient quantity ( only the one you can see from oil cap), reved it up hard several times . I took it than twice around the block - I couldn't hear the engine, smooth gearchange ( its auto). The way it was driving i would give it 10 out of 10. Than I decided to floor it on a motorway - did 120 MPH without any trouble. than when I was cursing with around 60 back home - i was coming to the junction I had to take - so I released the throttle - for first 10 sec it was allright - but than - started sounding like as if tappets dont get sufficient oil.(I would say sound is coming from the inlet manifold assembly). and it is loud - slightly resembles diesel. still plenty of power, the cam that I can see from the oil cap is still oily as it was before.
Any suggestions please :'(
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Let it idle for 10-15 mins and see what happens.
Has it had an engine flush recently or a good record of oil changes?
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yes- oil is reasonably clear and is not thin - it was supposedly serviced 2 weeks ago. and than - it wouldn't just go in one go i think - its as if something fell out of the engine. additionally if it was oil related I dont think i would see that much oil through oil cap.
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Exhaust manifold gasket leak?
I would have thought this would make a farty, blowy noise, but when ours went it was a really nasty metallic clack.
Just a thought.
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Thank you for quick replies.
I am going to the car to run it for 15 min and see what will happen.
Update: Didn't run it for 10 min - reason sligh misfire that wasn't there before the sound changed. with higher RPMs misfire becomes less apparent.
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I get flashbacks when I read this :-[
I had this sound on my last engine and the reason was that the cambelt had slipped quite a bit, although mine did this at very low revs. Hope this isn't the case with yours!
Other reasons I can think of:
- Loose spark plug
- One-way valve for the SAI system broken and blowing exhaust into the rubber hose from the pump (or the hose is off)
- Leaking manifold
You say you've changed the water pump. I hope you did cambelt + tensioners at the same time while you were "in there"? :y
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I didn't touch the cambelt. Previous owner had it changed by vauxhall 3 month ago and did 2K from then.
Edit: You say SAI valve - where is it ? - is it the thing-y thats in front of the auxiliary belt ?
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Yep. One pipe from each manifold joined together in the middle by a valve. Mine popped off once and made a tappety sound, but not so very metallic though.
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If I cant figure it out tomorrow - will record and post the sound in here.
tomorrow in the agenda:
1. checking spark plugs,
2. checking SAI valve and related hoses
2. Oil pressure test
3. checking timing belt for slipping
wish me luck - I will need it. :-[
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Cheer up, it's usually my stuff that goes bad :p I'm not sure how much more I can take, hehe :)
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Hi
Was the tensioner changed along with the belt? Its usually the tensioner that fails before the belt.
Alan
I didn't touch the cambelt. Previous owner had it changed by vauxhall 3 month ago and did 2K from then.
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I have no idea about the tensioner as I am new owner. car still runs. I looked at 3 accessible spark plugs and they are ok, no carbon deposit on them and definitely tight enough. I recorded the sound and will post it in a few minutes.
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What is this :
(http://a.imageshack.us/img571/6126/21082010.jpg) (http://img571.imageshack.us/i/21082010.jpg/)
I Dont think I have seen this black spot before:
(http://a.imageshack.us/img715/7045/21082010001.jpg) (http://img715.imageshack.us/i/21082010001.jpg/)
engine sound:
http://rapidshare.com/files/414248685/Sound_clip_05.wav
Sorry for the quality - couldn't find my camera so used my mobile phone.
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Somewhat hard to tell from the sound there, but to me it sounds like dry hydraulic lifters.
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my point exactly, but sound doesn't vary with sides and the cam that you can see from oil cap is oily like it should be - so I assume that it has sufficient oil pressure for lifters. Another thing is that in my opinion sound comes from the inlet manifold (top part of it - i think you have a different name for it). Its too loud to be precise about it though.
Edit: What about that valve thingy - is it possible its responsible?
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Presumably you had to undo the nut on the concertina stainless steel pipe between EGR and the exhaust manifold.
I can see that the bolt that goes in the bracket to the EGR is missing. I wonder if the nut on the concertina pipe is loose (or maybe the pipe has cracked?)
I left the nut loose on mine once and the sound wasn't very pleasant :( but it was quickly fixed by doing the nut up again :y
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Just checked- nut is fine.
But now for the weird stuff:
after 15 minutes practising yoga i managed to disconnect injection loom ( plug for whole injector set at the back of the nearside head) - and now when cranking - there is NO tappety sound :question
when injectors are on- its surely loud enough in Idle to be noticeable during cranking.
So my finding: no petrol => no power stroke => no sound
That ( to me ) means it not cambelt or tappets related.
Later one friend with more experience will come to hear it running and than if no reasonable suggestion from him - will try to isolate EGR valve completely and see what happens.
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I removed EGR and will make a plate to go between egr and inlet manifold to stop any gas passing.
Additionally my friend thinks it has dropped a valve and suggested to do a compression test - will do this before putting EGR valve with blanking plate back in place. ( at least on 3 cylinders below the valve)
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It has been raining all morning - couldn't even do a compression test.
Blanking plate is ready.
Still wondering what else could happened. Any ideas?
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Dunno but can I send the plod round with your 120mph admission? ;D
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Don't get me wrong - I don't like high speeds - But i am in love with acceleration - that is where i get my adrenalin. :D
But saying that I believe that one has to be total looser never trying to see how his car goes - even if only once when owing it.
Unfortunately I am paying the price for that - I think I am down to head out job as on right head I have 150- ish PSI on 2 cylinders and 300+ PSI on the front one - no idea what the hell has happened but will have to investigate.
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Update: I was trying to get to the cambelt today but rain didn't help.
I am doing a bit of a research so any comment will be greatly appreciated.
If I get it to work at least I will need one rocker cover as i believe its slightly bent. I do know this is common problem - should i go for one from vectra and use the older type gasket thats one for head and not separated into two parts?
Than if I end up needing a head - is it same from v6 2.6 newer engine? I would think its not - but still asking. What about other v6 vauxhalls ? anything compatible?
This will help me to decide what to do with the car depending on the damage. I might end up breaking it if damage is too severe.
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Unfortunately I am paying the price for that - I think I am down to head out job as on right head I have 150- ish PSI on 2 cylinders and 300+ PSI on the front one - no idea what the hell has happened but will have to investigate.
Could be that it's filled with fuel / water / oil?
Might be worth cranking without a plug in it to see if anything comes out?
Kevin
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hopefully all is good now - I found the fault - somewhere a needle bearing from old water pump was stuck and while driving fell between timing belt and crank pulley - result is one tooth out on crank - the thing is that there is a correction in measurements - compression on all cylinders is 250 psi +- 2 psi. so valves are not bent. will try to put it right and if compression is good - will do a cambelt change + all pulleys.
Thanks for suggestions.