WHINNING NOISE

[toptonyb]

ANY IDEAS WHY MY DCI ENGINE SEAMS TO HAVE A SLIGHT WHINNING NOISE?
IF IN NEUTRAL WITH ENGINE RUNNING & GET REVS UPTO ABOUT 1300 - 1600 RPM I CAN HEAR A SLIGHT WHINNIG NOISE? THE CAR HAS RECENTLY HAD A CAMBELT CHANGE & I CANNOT RECALL THE NOISE BEEN THERE WHEN WE TEST DROVE THE CAR, WE ONLY BOUGHT THE CAR IN NOV FROM A TRADER IN M'CHESTER. REVS OVER 1800 IT SEAMS TO DISAPEAR? NOT SURE THOU?
I AM COSIDERING BOOKING IT IN AT RENAULT FOR AN INDEPENDANT INSPECTION AS THE TRADER SAYS THE CAM BELT IS NOT TOO TIGHT ALL THE PULLEYS ARE FINE ETC, ETC?
CAN ANYONE PLEASE ADVISE.
ALL IN ALL WE LOVE THE CAR TO BITS, EXCELLENT MPG, £35.00 TAX, MEGA CHEAP INSURANCE, BLACK MICA PAINT, 4 X E/W, CD PLAYER, SEXY LOOKING STYLE.

[BurntCarcus]

The turbo?

[IainMW]

Turbo's Whistle, if they make a whinning noise they are knackered

More details on your car please
Engine, year, mileage, service history etc..

[pw981]

I was told the opposite of you IainMW? mine does what toptonyb's does, and has done since 30,000miles (now on 73,000). LGC/Antmat said when the turbo sounds like an old kettle whistling when its boiled.. thats when its knackered?

[AlexB]

toptonyb,

Please don't SHOUT. Describe quietly the details and, preferably, post the recording of the sound.

As it happens at 1600 rpm and below, then it is most likely related to the turbo changing its "geometry", i.e. operating the variable attack vanes. "Knackered" turbos whine at high loads.

Did they change the oil and the air filter in the service? If so, which is likely, then it could have caused a change in the sound. On the other hand, who knows... Compare the sound to the other cars around, including new Renault, VW, BMW, MB, etc. Webcode said that when his turbo went South, he could hear it with windows closed, so it was very loud. LGC compared his turbo to a screaming pig, which is also loud.

If in doubt, change the oil to the best synthetic you can afford, check all pipes/intercooler/sensors and read the ECU codes. The codes related to air flow and boost pressure would mean that there exists a fault that is trying to damage the turbo.

Finally, it may be something different...

[toptonyb]

thank you all so much for your advice, after reading loads of reports on dephasers? i possibly thought this could be the problem? my megane is a 2004 '04' reg 1.5 tdci 'expression' model, one company owner, frsh 110000miles, cambelt & pulley changed on 10.11.07 & full service, in july 2007 it had a new turbo assembly fitted, i can hear the turbo phizzing? away while driving but the whinning kind of sound seams to over power the phizzing of the turbo & sounds totally different to the turbo sound? i guess initially i may have to do illimination of suggested problems? eg oil, etc.
i do not really want to pay for an independant inspection on the car to find out if its serious or not? i am just curious as to what it can be? last thing i want is it to pack up over xmas/new year.
thanks again for the info, your all stars, cheers

[Bumpy macaroon]

Toptony,
pretty sure dephasers are only found on the VVTI petrol lumps so your Dci wont have one, could be something like grumbly gearbox had one on a vauxhall in neutral, clutch, alternator bearings only put those on as yours is a high miler also read thread from link below interesting cam belt / water pump stuff good luck

https://www.meganeownersclub.co.uk/forum ... =waterpump

[AlexB]

toptonyb,

Elimination is a valid approach. However, if you have had the turbo replaced, then it is a different matter. I am convinced that turbos do not fail on their own. The failures are either caused by bad oil plus extended drain intervals or faults in the boost control loop. If they replaced only the turbo, then the fault may be still there! So, think and give us more information. All details on all repairs/services are relevant. You may also want to read the original Renault documents pointed at in my message in Links section (second pointer).

Another option. Different turbos may sound differently. Bad gaskets often cause noise. Keep it in mind and please comment on it.

What the Macaroon said is also true. Sounds may be also caused by the gearbox. It makes sense to change the gearbox oil to a proper synthetic, as I did.

[onlydiesels]

it could be worth buying yourself an automotive stethoscope,then you can have a good listen to alternator,fuel pump etc whilst on idle and/or with someone holding a few revs on it for you.
you`ll find a good few on ebay and for the cost of them (around a tenner)you will get value for money out of it as you can listen to many components with it.

[toptonyb]

hi me again, i have had the car in to a garage for most of the day to try & find out what this noise is? i am now assured the noise is simply a whirring noise some diesel engines make & is nothing to worry about, although the mechanic did advise on changing oil in engine & in gearbox to a renault specified grade?i a now trying to find out what oil has been used in the service when we bought the car,
the mechanic was unable to tell me why it only does it at low revs & when just sitting running at around 12000rpm ish???????
thank you all very much for your help its been really helpful & i have taken all of it onboard & i wish all you megane owners a very merry christmas & a great new year, hohoho.

[cactusbob]

Without taking it to a good Renault specialist it's difficult to say what it could be. It wasn't making the noise before so I also would be concerned. It may be that the new belt is correctly tensioned and is putting more strain on the water pump or alternator and it could be that making the noise

[toptonyb]

hi, i am going to go & buy some oil tomorrow for engine & gearbox what oil would i need for a 1.5 dci?
also how much will i need to buy for each.
cheers pals

[IainMW]

You need a 5W40 ACEA B3 B4 fully synthetic oil for you lump 4.6ltrs
and a 75W90 API GL5 gear oil 2.5 ltrs (Do not add any more than that or it's goodbye gearbox )

You can use the product/application guides on these websites to find the lubricants you need, but also check you service book.

https://www.commaoil.co.uk/
https://www.castrol.com
https://www.millersoils.net/index2.html
https://www.valvolineuk.com/

Or if you want expert advice contact oilman at https://www.opieoils.co.uk

[garlum]

Hi. I thought I'd revive this thread rather than start a new one. My car makes a similar sound as described by original poster i.e. whines at low revs, low load, most notably on picking up revs to move off slowly e.g. when in stop start traffic. I haven't really noticed it before today, but I usually have music on! Today I turned the music off and was stuck in traffic for an hour. I've grown used to the sound of the turbo under boost, but this noise seems new. Is it time to be looking at a new car? My confidence in Renault diesel engines is low, and the warranty which covered the turbo is virtually run out.

The car is a 2004 1.9dci dynamique. 63k miles, serviced at manufacturer intervals.

I look forward to people's thoughts.

[AlexB]

My thought is that you've done 9k since the last service and it is time for a new load of Mobil 1 0w40 or something of similar quality (with MB229.5 or RN0710 on the label). Then see if the sound remains. Also check everything for air leaks.