One of these pesky noise questions

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lucklesspedestrian
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One of these pesky noise questions

Post by lucklesspedestrian »

Hi there

I have a 56 plate C5 1.6 HDi manual hatch with 60K on the clock.

I've started to notice an engine noise when the engine is idling which disappears as the revs are dialled in. Makes no difference if the clutch is in or out.

It sounds like (feel free to laugh) the noise crickets make at night if you're on holiday in the med or such like (sort of a chirpy tinkling sound)

It's possibly always been there, maybe I'm just noticing it and as I say, it goes once the revs start to build.

I'm guessing a belt?

Any ideas?
Steve
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Post by Peter.N. »

Sounds like good old diesel knock to me, if it dissapears as soon as you give it some throttle I wouldn't worry about it. The only other thing I can think of is the alternator belt slipping.

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Post by dnsey »

Does the 1.6 have a dual-mass crank pulley?
If so, it could be failing :cry:
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Post by SaabC5 »

The 2.2 does and this was the culprit when i had a similar noise.
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vince
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Post by vince »

All day long this will be a crank pulley id bet :wink: A chirruping noise is how we describe it to customers. The HDI's are prone for crank pulley failure. My TD Xantia makes the same noise for a few minutes in the dead of winter until it warms....again engine speed increases it dissapears, but the HDI's are worse for it.

Part number is usually 023PC0010 at GSF or 023PC0012 ...thats how many ive sold i remember the part number :lol:

They do cheaper quality and OE quality ones....ive not had any cheaper ones back yet so they must be ok :wink:

Hope that helps

Vince
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Post by Dommo »

Only a quick reply as I'm on my phone, see if having the AC on or off makes any odds. That loads up the auxiliary belt system and sometimes shuts the noise up if it's on the aux belt system.
lucklesspedestrian
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Post by lucklesspedestrian »

Really helpful guys, thanks so much for the replies.
Steve
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Post by Citroenmad »

Can you try and pinpoint an area in the engine bay where the noise is coming from?
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thatfatbloke
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Post by thatfatbloke »

We've had this same noise on the Synergie 1.9td for over three years now. In September 2008 it was diagnosed as the 'auxillary drive belt tensioner and spring' which were replaced. £201.45 later and the damn noise was still there. NOT HAPPY. I tried the old 'You mis-diagnosed the problem,so I'm not paying 'til it's fixed properly' routine - but the bandits wouldn't give us the keys back until the bill was paid.
Other mechanic's including a main dealer have since diagnosed the noise as 'the crankshaft pulley bearing mate'. Have never had the money to get it fixed as there was always something else wrong with it that took priority over the chirruping noise,so can't tell you how much it would cost to fix.
Only does it when engine cold,goes away with revs and a warm engine. What would happen if it 'seized'? Good luck.
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Post by Xantidote »

I thought only the HDIs suffered with failing crankshaft pulleys.

Without looking, I had assumed my TD has the solid pulley, as opposed to the sandwich type. Were some TDs fitted with the sandwich type?
Martin

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Post by citronut »

if it goes away when engine warm/hot i would say it is aux drive belt needs tightening a little more,

alway check the easy/simple bits first,

regards malcolm
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Post by mendedit »

I would remove the drive belt and start up if the noise stops then it must be the belt or something it's driving.
The world is full of them and a lot are in
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Post by vince »

See the for sale section i just posted up a thread on these...pure coincidence.

Martin....the TD's also suffer from the sale problem only less so than the HDI's :wink:
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