Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: feeutfo on 20 December 2012, 06:16:36
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http://i344.photobucket.com/albums/p326/chrisgixer/BA7DCDE3-5D49-47C4-AEF1-C2B104A3FBCD-1832-000000EF7AE0DE69.mp4
iPhone video may not play on all devices?
Removing aux belt stops the noise, it's only ever there for a minute or so
On cold starts. Seems to be coming from the ac pump.
I have replaced
Aux belt
Pas pump
Idler pulley
All bolts are tight on various pulley wheels
Turning ac on and off makes no odds.
Spraying silicon lube on the belt stops the noise for a while.
Annoying thing is, every time I touch the belt the noise stops for a while. Thinking its fixed after each bit of work done mentioned above.
It always comes back after a couple if days.
Short of re gas or new/other pump, I don't know what else to try. :(
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Have the same problem ,here although mine is a M/F circa 1998.
On cold start very definite noise which also seems to be coming from A/C pump but only for 30/40 seconds and then clears.Has been doing it now for several months and sound is very metalic.
Solution for me was every night when pull car onto driveway switch of A/C so when started again next day A/C is off until engine has run for minute or so ,then switch it on and noise is no longer evident.
Assume it must be just down to the cold on the belt /metal/bearings etc...but does sound nasty when starting up
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Mine makes that noise too.
Goes away while I rev it a bit, then disappears in a couple of minutes or so.
I'm ignoring it until it breaks! You can spend huge amounts of time and money chasing noises on cars, both of which are are short supply for me these days!
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Was the air con running or in ECO mode? Does it make a difference?
If the air con wasn't running, probably just the compressor clutch rattling a bit. Probably not worth worrying about at this stage. If air con was on, then might be a more serious issue with the compressor.
Having said that, the fact it disappears with some lube on the belt and as it warms up makes me think it could just be the belt slipping a little. Difficult to tell from the sound, but the belt will warm up and get more supple after a few minutes.
Load on the belt will also be heavy to start with as it's charging the battery heavily.
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My concern is belt slip caused by a stiff aux pulley, i.e. the ac pump. Is it about go seize? It's never been re gassed afaik, so could it be low on oil if the gas is low too? Even though the ac still works well. It does sound like belt slip IMO.
Eco was off in the video. I did try starting with Eco on (ac off) and it didn't make any odds. But I wll try it again to be sure.
...or could the tensioner be week?
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I would say that if the air con is cooling there'll be little wrong with it. The refrigerant is much, much less dense than the oil so if anything is going to leak out that will go first. If it squeaks in ECO mode too, then air con is out of the picture anyway. I don't think it's anything to worry about, TBH.
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It's annoying. That's all at the moment.
There was a point in the spring where some green die was seen on the bottom of the ac pump. This has now gone and not returned. Maybe lack of use since going through the winter. Although, I never use eco mode.
Thinking about it, is green die oe? Or would the die indicate a re gas?
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I think the AC clutch only engages after the engine has been running for about half a minute or so,it won't be engaged on start up as the horsepower required to drive it would soon bugger the starter motor,if you get someone to start it cold while you watch you will see when the clutch engages and if it coincides with the noise dissapearing :y
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Had this on the Elite Estate - result was the a/c compressor bearing seized resulting in being unable to turn engine over on the starter. As I was selling it, removed aux belt and fitted a 2 lit (with a/c) belt bypassing compressor (Vx dealer seemed unable to find correct V6 belt so I asked for the 2 lit belt which was in stock - same part no. as V6 no a/c belt ::) )
Might be prudent to carry a 2 lit belt if you are going to continue to use it.
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It's annoying. That's all at the moment.
There was a point in the spring where some green die was seen on the bottom of the ac pump. This has now gone and not returned. Maybe lack of use since going through the winter. Although, I never use eco mode.
Thinking about it, is green die oe? Or would the die indicate a re gas?
No it indicates a leak!! Illegal to regass a leaking a/c system.
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It's annoying. That's all at the moment.
There was a point in the spring where some green die was seen on the bottom of the ac pump. This has now gone and not returned. Maybe lack of use since going through the winter. Although, I never use eco mode.
Thinking about it, is green die oe? Or would the die indicate a re gas?
No it indicates a leak!! Illegal to regass a leaking a/c system.
;D well yes, apart from that ;D
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Does noise return if you turn eco on?
I had a noise on the bullet, was the clutch. Changed compressor (twice) in the end, but for other reasons
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Mine is doing the same :(
I thought it might be the cambelt tensioners initially and was disappointed that the noise carried on after the last cambelt change.
Next thing I changed was the auxiliary belt tensioner pulley, that made no difference.
Next was the water pump, still no change :(
I am at a loss, it sounds higher up and nearer to the centre than the A/C compressor.
It sounds like a fractured/loose metal bracket :-\ top suspect is exhaust gaskets at the moment, I can't think of anything else that would warm up (and shut up) so soon after a cold start (and not come back till the next cold start)
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Apparently it's quite common to see a little bit of the green die on the underside of the AC compressor according to Sassanach. Certainly seen it on the one on my V6, not seen it on the diesel one as it's
covered in shite rather dirty
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Mine is doing the same :(
I thought it might be the cambelt tensioners initially and was disappointed that the noise carried on after the last cambelt change.
Next thing I changed was the auxiliary belt tensioner pulley, that made no difference.
Next was the water pump, still no change :(
I am at a loss, it sounds higher up and nearer to the centre than the A/C compressor.
It sounds like a fractured/loose metal bracket :-\ top suspect is exhaust gaskets at the moment, I can't think of anything else that would warm up (and shut up) so soon after a cold start (and not come back till the next cold start)
running with aux belt temporaily removed should isolate engine from aux run noises...?
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Apparently it's quite common to see a little bit of the green die on the underside of the AC compressor according to Sassanach. Certainly seen it on the one on my V6, not seen it on the diesel one as it's covered in shite rather dirty
yes it seems to have cleared up to. Seals expanded maybe?
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Mine is doing the same :(
I thought it might be the cambelt tensioners initially and was disappointed that the noise carried on after the last cambelt change.
Next thing I changed was the auxiliary belt tensioner pulley, that made no difference.
Next was the water pump, still no change :(
I am at a loss, it sounds higher up and nearer to the centre than the A/C compressor.
It sounds like a fractured/loose metal bracket :-\ top suspect is exhaust gaskets at the moment, I can't think of anything else that would warm up (and shut up) so soon after a cold start (and not come back till the next cold start)
running with aux belt temporaily removed should isolate engine from aux run noises...?
You are right. I just need to work up enough enthusiasm to take the belt off in the dark one morning :(
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Was the air con running or in ECO mode? Does it make a difference?
If the air con wasn't running, probably just the compressor clutch rattling a bit. Probably not worth worrying about at this stage. If air con was on, then might be a more serious issue with the compressor.
Having said that, the fact it disappears with some lube on the belt and as it warms up makes me think it could just be the belt slipping a little. Difficult to tell from the sound, but the belt will warm up and get more supple after a few minutes.
Load on the belt will also be heavy to start with as it's charging the battery heavily.
I think you may have the answers there. The only other point is that the pulleys ring like bells if tapped with something metal. If a heavily loaded belt is slipping & squeaking it might hit the natural frequency of the pulley which might explain the harsh, metallic noise :-\
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Apparently it's quite common to see a little bit of the green die on the underside of the AC compressor according to Sassanach. Certainly seen it on the one on my V6, not seen it on the diesel one as it's covered in shite rather dirty
yes it seems to have cleared up to. Seals expanded maybe?
More likely pressure has dropped.
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have the same noise. Gone by the time i have backed off the drive.
Has anyone changed the actual tensioner?
As said, its just annoying. Initial belt load and cold stiffness of the belt sounds feasable to me.
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how about conducting an airconectomy !
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have the same noise. Gone by the time i have backed off the drive.
Has anyone changed the actual tensioner?
As said, its just annoying. Initial belt load and cold stiffness of the belt sounds feasable to me.
I changed the tensioner pulley.
I couldn't see the point of changing the spring loaded arm, there didn't appear to be anything wrong with it and I can't see any way in which it could cause a noise at start up that stops 30 seconds later :-\
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how about conducting an airconectomy !
thats not a bad idea. fit a belt for a non air con car.
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how about conducting an airconectomy !
Steamy windows in winter and and sweaty leather in summer. No way josey. ;)
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I have the same noise, its been like it for years on mine
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Been fiddling with this again today. Must be belt related.
All pulleys spin free, ac still works fine. New alternator fitted since this thread was started. Eco on or off makes no odds. Turning the steering lock to lock makes no odds.
I've just sprayed the aux belt with silicon spray and it's instantly gone quiet.
I'm going to turn the belt round once the silicon spray has worn off and see if that makes any odds, if not, new tensioner (spring bit).
The new belt has threads showing on the edge from the manufacturing process, where they cut it presumably, so just want to see if belt direction affects it.
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Mine hasn't made the noise for a while :)
I think it is because I have been using it every day and the weather has improved (ie the floods have receded a little) :-\
I think I did enough to be sure that nothing was about to fail so not going to worry about it.................
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Had a similar noise on my old 2.0. Drove me mad trying to find it, i just couldn't pin point where it was coming from. Same as you a bit of lub stopped the noise. Had the water pump changed, fan belt, tensioner and bearing in alternator with no luck. Know this sounds strange by it turned out the be the pulley wheel on the alternator. The groves had slightly worn down over the years and the belt would move about across the pulley causing excess presser on the alternation bearings. The lub gave the belt,pulley contact a fine cushion layer until the belt had warmed up a bit thought the friction of going around the pulleys for a minute or so. Changed the alternator pulley wheel and fitted another new belt and it cured the noise.
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How strange. Mine made that same noise a couple of times when I was fitting the LPG kit. Now I been using it more again. It's gone away again.
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Think I have fixed this.
Started it this morning, two seconds later, noise started.
Engine off.
Put the old bealt back on.
Started engine, no noise.
Looking at the new belt just removed, there's bits of cord sticking out the side, like little spurs. The old belt has none of this.
See how it is in the morning but, quietly confident. :)
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Still silent. :)