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[mka306]

The Water Pump runs off the Aux Belt, nothing to do with the Cam Belt Change, whip the Aux Belt off, as said before, my money is on a noisy water pump bearing.

My opinion as well.   If you remove the aux belt , you will find out instantly if the problem is related to those components that the belt runs.   

Would advise that you make a sketch of the aux belt route though before removing , to assist refitting of it

Bottom line is though  . . DON'T  run the engine without the aux belt more than a couple of minutes

Understood and thank you.

[powerslinky]

The Water Pump runs off the Aux Belt, nothing to do with the Cam Belt Change, whip the Aux Belt off, as said before, my money is on a noisy water pump bearing.
[/quote

oops!  double post   sorry   no can delete

[mka306]

Well I took the Aux belt off and checked the pulleys, no noticeable play in the pulleys so I started the engine and the noise was still there.

I then topped up the oil as it was 1 notch from max (I did this while the engine was running), after a minute it went quiet, I have started the engine twice more today both times it was approx 4 hours between starts and the sound was faint and went after a few seconds. I'm stumped???

[Andy B]

.

I then topped up the oil as it was 1 notch from max (I did this while the engine was running), ......

strange noise aside ...... you can't properly check your oil level while the engine is running. The pump is pumping oil everywhere & 'using' oil from the sump distributing to bearings cam etc so the oil level is lower on the dipstick. If you top it to the max when running, then all the oil that is in the galleries will fall to the sump when the engine stops and so make the oil level to high.

[mka306]

Christ how much of an idiot do you think I am??? I know how to check the oil level correctly for petes sake!!

[Andy B]

Christ how much of an idiot do you think I am??? I know how to check the oil level correctly for petes sake!!

I only read what you posted ........ 

I then topped up the oil as it was 1 notch from max (I did this while the engine was running), ...

[moggy]

Christ how much of an idiot do you think I am??? I know how to check the oil level correctly for petes sake!!

Andy is right mate,and he is just trying to help.

[mka306]

I can understand the miss interpretation of what I wrote but to then give me the whole ins and out of how to do it and what goes wrong was just insulting.

Believe me I am very appreciative of all help given as it is priceless but maybe ask for clarification instead of making an assumption which just made me feel like a total dimwit.

Well no harm done and I have no hard feelings so I will apologise for my reaction and I hope we can move past it.

[The Sheriff]

I can understand the miss interpretation of what I wrote but to then give me the whole ins and out of how to do it and what goes wrong was just insulting.

Believe me I am very appreciative of all help given as it is priceless but maybe ask for clarification instead of making an assumption which just made me feel like a total dimwit.

Well no harm done and I have no hard feelings so I will apologise for my reaction and I hope we can move past it.

Don't let it happen again, Dumbo 

[mka306]

   Lol, oh ok then my bad

[powerslinky]

Ok then  . . last few posts aside  . .   lets get back to the problem.

just thinking this thread would be better in "Omega General Help" as more members are likely to see & possibly diagnose it there     

The sound/noise you have  does still happen with the aux belt off ?  presume yes  . so cannot should not be anything to do with water pump, alternator or any of the other couple of things that the aux belt runs 

Presume that it was not making this noise before you carried out the oil cooler work ?

Once the noise has stopped & engine is quiet,  if you turn off the engine & then  re start it , is the noise there again ?

If not, my opinion would be lack of oil at the lifters on start up, which IMO really has no reason to occur by doing an oil cooler repair , if it was not there prior to that work being carried out:-\

Lets get the answers to these questions first , then move on 

[mka306]

Ok the noise was not there before I did the oil cooler change, I have changed the oil cooler with a genuine GM and I followed the guide to the letter and all came out and went back in with no real issues.

When the car is started from cold i.e first thing in the morning the noise is there, it then fades after no more than 30 secs to 1 min. If I start the engine again say 4 hours later the noise comes and goes within 10 secs.

The only thing I can remember thinking was odd was a random pipe being attached at one end but not the other, this is at the back of the engine but I can't see where it would of come from and I didn't pull it off so I assumed it may be the drainage pipe for the air con? Or could this be the issue and I need to find where the pipe has come from??

[powerslinky]

Ok the noise was not there before I did the oil cooler change, I have changed the oil cooler with a genuine GM and I followed the guide to the letter and all came out and went back in with no real issues.

When the car is started from cold i.e first thing in the morning the noise is there, it then fades after no more than 30 secs to 1 min. If I start the engine again say 4 hours later the noise comes and goes within 10 secs.

The only thing I can remember thinking was odd was a random pipe being attached at one end but not the other, this is at the back of the engine but I can't see where it would of come from and I didn't pull it off so I assumed it may be the drainage pipe for the air con? Or could this be the issue and I need to find where the pipe has come from??

That black rubber pipe is  almost certainly the auto box breather. It should run down the back & onto a small pipe coming out of the top, towards the back  of the AR35    so no problem there .

From your response it sounds to me as if it is lack of oil at the lifters on start up . I think there should be a non return valve in the system somewhere to stop the oil draining back from the top of the engine when not running  . Not 100% on that , but someone else  will soon advise on that 
Seems strange though that it did not do this before you carried out the oil cooler work 

As a thought , when cold , start the engine & while the noise is prominate & at it's loudest, take off the oil filler & listen to see if noise gets louder with that off . If so , that should point to that it is coming from cam/lifter area on the 2-4-6 bank at least. If oil is draining back to the lower part of the engine , I would say that both banks will be affected 

Hopefully you will get more feedback from more knowledgeable members on here  , but HTH 

[mka306]

Every new bit of info is a help and very much appreciated, I can see me taking the plenum back off and may be a few other bits to see if there is anything obvious but as I never opened the cam covers or touched anything else other than what was stated I do feel a bit confused.

Still I shall go and see what the noise is like with the cap off and my ear pinned to it