S40 2.0d 2010 cold start rattle

Vrlika · Sep 1st, 2015, 03:46

Hi all
Every time after it rains when I start the engine it rattles like loose pulley or something metallic but can't pin point it .
Been to the garage and had ac compressor and alternator replaced but noise is still there also replaced the belt.
It last for 30-40 secs after it warms up then it's quite.
http://youtu.be/JZ2uJ_Tuzrs
http://youtu.be/KVl9rPxIusw
I hope someone out there had the same noise might know what is the cause ?
Thanks

Welton · Sep 1st, 2015, 08:27

Changing the a/c compressor isn't cheap is it? did mine last year

That's a tricky noise to pin point but because it seems to clear up fairly quickly I'd be inclined to think it was an idler/tensioner problem on the auxilary belt side of things, possibly the bottom pulley itself (they are a bonded rubber dampened unit) or even something to do with the cambelt rollers/guides etc.

The bearings of the various rollers/tensioners seem sensitive to damp weather in my experience.

Vrlika · Sep 1st, 2015, 17:43

Ac compressor was leaking gas so did that anyway but replaced alternator for that reason now before forking out more money need some pointers from other people before going back to the garage. Unless I leave it with them on a rainy day so they can hear it lol.
Heard about exhaust manifold, heat shield making rattle noise but since alternator change it sound a bit different so you might be right there.

Sep 1st, 2015, 03:46	#1
Vrlika New Member Last Online: Jul 13th, 2018 22:36 Join Date: Feb 2014 Location: Midlands	S40 2.0d 2010 cold start rattle Hi all Every time after it rains when I start the engine it rattles like loose pulley or something metallic but can't pin point it . Been to the garage and had ac compressor and alternator replaced but noise is still there also replaced the belt. It last for 30-40 secs after it warms up then it's quite. http://youtu.be/JZ2uJ_Tuzrs http://youtu.be/KVl9rPxIusw I hope someone out there had the same noise might know what is the cause ? Thanks Last edited by Vrlika; Sep 1st, 2015 at 04:00.

Sep 1st, 2015, 08:27	#2
Welton Premier Member Last Online: Sep 14th, 2021 17:03 Join Date: Feb 2009 Location: Market Harborough	Changing the a/c compressor isn't cheap is it? did mine last year That's a tricky noise to pin point but because it seems to clear up fairly quickly I'd be inclined to think it was an idler/tensioner problem on the auxilary belt side of things, possibly the bottom pulley itself (they are a bonded rubber dampened unit) or even something to do with the cambelt rollers/guides etc. The bearings of the various rollers/tensioners seem sensitive to damp weather in my experience. __________________ 2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale) 2010 Citroen C4 1.6 HDi (bizarre Gearbox model). 2010 Renault Twingo (refreshingly simple) 2018 Infiniti Q30 1.6T Business Executive (what's this button do?)

Sep 1st, 2015, 17:43	#3
Vrlika New Member Last Online: Jul 13th, 2018 22:36 Join Date: Feb 2014 Location: Midlands	Ac compressor was leaking gas so did that anyway but replaced alternator for that reason now before forking out more money need some pointers from other people before going back to the garage. Unless I leave it with them on a rainy day so they can hear it lol. Heard about exhaust manifold, heat shield making rattle noise but since alternator change it sound a bit different so you might be right there.

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