Strange 'whoosh' (or bearing noise) after revving - OM642 (with sound example)

[TeddyRuxpin]

Hi

Was just checking the engine mounts on my W212 with OM642 (which need replacing I think) and it reminded me that I sometimes hear a strange noise after revving my car in neutral (and probably not in neutral - but I can't hear it then!). I've attached two videos below, mainly to show the noise.

The car has no error codes and seems to drive okay - except for cabin vibration which I believe is down to the engine (and transmission) mounts which I'm going to order (Lemforder). Full MB service history, clean air filters, etc.

Anybody have an idea what it is? A pulley bearing? A vacuum leak? Turbo continuing to spin? Totally normal?

Anybody have similar experience?

Thanks!

Ed

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[TeddyRuxpin]

Actually, could this be related to the air conditioning being on?

I'll repeat the test with it off.

Edit: found a thread on it here: V6 CDI Induction? noise.

Consensus seems to be that it's 'normal'...?

I don't remember it always being there, though.

 

[mersum1es]

That's 'normal' at some state, a time ago I was diagnosing a car of local forum member and he was complaining at similar noise. We were listening both his and my cars and it was present in both cars. Lately there was also some discussion in forum and common conclusion that it can be heard in all of them.

Just your noise sounds much louder and harsher than ours, but even we two had slightly different sound of it. We had one thing common, bith had stretched timing chains at the time. When I later listened the sound (after chain and tesnioner change), I have a strong feeling the noise is smoother and more like a sighing.

 

[phobos]

I get a similar whoosh sound on my OM 642 - 231 bhp, when the DPF is cleaning itself ( i.e burning itself). It last for a 5-10 minutes depending on the state of the DPF and you can tell as idle is around 700 - 750 rpm.

 

[TeddyRuxpin]

That's 'normal' at some state, a time ago I was diagnosing a car of local forum member and he was complaining at similar noise. We were listening both his and my cars and it was present in both cars. Lately there was also some discussion in forum and common conclusion that it can be heard in all of them.

Just your noise sounds much louder and harsher than ours, but even we two had slightly different sound of it. We had one thing common, bith had stretched timing chains at the time. When I later listened the sound (after chain and tesnioner change), I have a strong feeling the noise is smoother and more like a sighing.

Interesting - thanks! It seems to come and go.

I bet chain and tensioner change was pricey - I didn't realise they needed doing on this model of engine.

I get a similar whoosh sound on my OM 642 - 231 bhp, when the DPF is cleaning itself ( i.e burning itself). It last for a 5-10 minutes depending on the state of the DPF and you can tell as idle is around 700 - 750 rpm.

Funnily enough, I first heard this when the DPF was regenrating. When it stopped regen, and it didn't do it after that, just a few moments later.

However today it definitely wasn't doing a regen and the noise was there...

 

[mersum1es]

OM642 chain is stretching too, only bad damages are rare. Lot of pictures posted on different MB forums, older engines (up to ~2010 or something) tensioner is easy to check via oil filler hole.

 

[tcb180]

Hi

Was just checking the engine mounts on my W212 with OM642 (which need replacing I think) and it reminded me that I sometimes hear a strange noise after revving my car in neutral (and probably not in neutral - but I can't hear it then!). I've attached two videos below, mainly to show the noise.

The car has no error codes and seems to drive okay - except for cabin vibration which I believe is down to the engine (and transmission) mounts which I'm going to order (Lemforder). Full MB service history, clean air filters, etc.

Anybody have an idea what it is? A pulley bearing? A vacuum leak? Turbo continuing to spin? Totally normal?

Anybody have similar experience?

Thanks!

Ed

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Accept third party cookies

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I had just about replaced all that there was on my OM642 E class 2007 and it was still there. I have just done the oil cooler seals and in the process I had the turbo refurbished and there was a slight bearing noise from water pump. It is now as smooth as and quiet at last.

Start by slipping the belt off and spinning all the pulleys. See if any lift on water pump pulley. I had none but bearing was noisey but you cant find this out with coolant in the system. I did put a good turbo cleaner through it and that seemed to quieten it down for a while. So could be the variable vane side of the turbo gunged up?

I have now deleted the swirl flaps and egr on mine. You would be amazed at how much muck is in there.

 

[TeddyRuxpin]

Sorry - are you saying that you had this 'issue' and now you don't?

Do you know what the exact source of the noise was - did it go away with the turbo was refurbed?

 

[tcb180]

Sorry - are you saying that you had this 'issue' and now you don't?

Do you know what the exact source of the noise was - did it go away with the turbo was refurbed?

I renewed the alternator clutch pulley. All the auxiliary belt rollers and tensioner. ( the rollers and pulley had some noise in them despite my Indy stating they were good). The aircon clutch pulley was also done. Still had the noise. Next was the turbo cleaner treatment using Forte added to fuel tank. This did quieten it for a little while so I would say yes the turbo refurb must have done it? But there was a noisey bearing in the water pump when I did the recent work. If I were you I'd start by slipping the aux belt off and spin all the pulleys checking for noise. Don't know what mileage you've done and the past service history but if its around 100k chances are a water pump wont hurt. But you could bung two bottles of Forte in the tank added to 50 litres fuel and do the 200 miles keeping her below 3000 rpm followed by a good blast and see. Around £24 for two.

Also read the thread I just put up re swirl flap and egr delete. Mine just turned 100k and the muck in the inlets was unbelievable. So the turbo will also suffer. The variable vanes coke up. Good luck.

 

[tcb180]

I renewed the alternator clutch pulley. All the auxiliary belt rollers and tensioner. ( the rollers and pulley had some noise in them despite my Indy stating they were good). The aircon clutch pulley was also done. Still had the noise. Next was the turbo cleaner treatment using Forte added to fuel tank. This did quieten it for a little while so I would say yes the turbo refurb must have done it? But there was a noisey bearing in the water pump when I did the recent work. If I were you I'd start by slipping the aux belt off and spin all the pulleys checking for noise. Don't know what mileage you've done and the past service history but if its around 100k chances are a water pump wont hurt. But you could bung two bottles of Forte in the tank added to 50 litres fuel and do the 200 miles keeping her below 3000 rpm followed by a good blast and see. Around £24 for two.

Also read the thread I just put up re swirl flap and egr delete. Mine just turned 100k and the muck in the inlets was unbelievable. So the turbo will also suffer. The variable vanes coke up. Good luck.

Yes Confirm now I dont get any noise. So Turbo or water pump for me.

 

[Stocho]

Have that noise on my W211 E320CDI 2007 as well. Was warring me ad now I know it is common. Now will think about using Forte.

 

[TeddyRuxpin]

Hmm, I already use V-Power diesel exclusively for the past 18 months (i.e. since I've owned the car)... not sure the Forte stuff would do much?

 

[tcb180]

Doesn't matter what you use guys these engines are awful due to the egr and swirl flap set up. I'll put some pics up later of what came out of my 100k 2007 E320 cdi

 

[TeddyRuxpin]

I've cleaned my EGR valve, already, I might do it again and possibly the EGR pipe... but are we sure this is related to the sound, or are we just talking about the engine in general?

 

[tcb180]

Start by taking auxiliary belt off. Spin all pulleys and rollers by hand and check if any play in water pump bearing.

 

[tcb180]

I've cleaned my EGR valve, already, I might do it again and possibly the EGR pipe... but are we sure this is related to the sound, or are we just talking about the engine in general?

Wont be egr valve.

 

[Sicario]

Ive just had my oil cooler & seals replaced last week, and just today i have noticed this exact sound, it 100% wasn't ever there before. It sounds very worrying like a back pressure on the turbo (like a egr blanking plate), but i have to say that it was accompanied by a burning smell which could coincide with my dpf possibly having a clear-out, i dont get any dash warnings to say my DPF is in regen mode, how do you know if the dpf is in regen mode???

Interesting side note about this Forte stuff though, will look into it.

or is this the stuff to use? Anyone used this ?? JLM Diesel Turbo Cleaner | JLM

 

[ptruman]

When I bought my W212 it was "whooshing" - turns out a couple of hoses were loose (top and bottom of engine). Which also explained a bit of oil seen on the bell housing, which initially made me think the oil cooler seals had gone (yargh).

I also get burny smells every so often which I put down to the good old DPF

The initial "chitter" noise I heard in the vid sounds like a waste gate issue (I had a borked turbo in my old Jag XF) - but letting someone check all your hoses is not a bad first idea....

 

[Sicario]

They should all be tight as the oil cooler was replaced last week. Right now it’s not making the woosh noise and it’s running ok. A front suspension spring went bang this morning, it never freakin’ rains

 

[alexanderfoti]

This is normal on all of them, but can very in volume. Its the turbo VNT releasing dropping the boost as you chop the throttle. If you hold the revs at 3k in neutral it will do it on and off by itself.