UK f30 alternator and idler pully bolts

rukp · 01-29-2024, 12:44 PM

Hi All,

Per the title, anyone know if the bolts can be reused made of steel or are they torque to yield one time bolts..

Thanks
rukp

bishbosh · 01-30-2024, 03:29 AM

Checked newtis, they can be reused.

Torque to 38Nm.

rukp · 01-30-2024, 03:58 AM

Quote:

Originally Posted by bishbosh

Checked newtis, they can be reused.

Torque to 38Nm.

Cheers Bishbosh for checking

Rgds
Rukp

rukp · 02-02-2024, 01:07 PM

So I went to replace the alternator, idler and belt today. To be sure it was one of these at fault. I removed the belt, so nothing on ac compressor or alternator. Started the car and Sods law! The noise is still there?!

Am a bit stumped anyone got any pointers, may have to give it to mechanic but much happier to DIY...

Thks

Reply

Allworth · 02-02-2024, 02:32 PM

Quote:

Originally Posted by rukp

So I went to replace the alternator, idler and belt today. To be sure it was one of these at fault. I removed the belt, so nothing on ac compressor or alternator. Started the car and Sods law! The noise is still there?!

Am a bit stumped anyone got any pointers, may have to give it to mechanic but much happier to DIY...

Thks

Reply

Might the thing between driver's seat and steering wheel that is making noise.

dholdi2 · 02-02-2024, 02:44 PM

I think I have read about cases of the crankshaft pulley failing, maybe have a look at that ?

TurboWeasel · 02-03-2024, 04:23 AM

That /\. With the belt removed, grab the crank pulley and rock it about. If there's excessive movement, the rubber dampener has failed....and that can take the main bearing behind it out if left like that for too long.

What kind of noise are we talking about? Rattling? Whining? You can get a whine from cold for <1 minute which is probably the oil pump. Cold oil is more viscous so the pump has to work harder.

Maybe get a cheap stethoscope from Amazon and start probing the engine to pin point the source of the noise. Worn out chain guides can make a scratching and/or plasticky rubbing noise.

rukp · 02-08-2024, 06:39 PM

Hi, this is the noise.

Since this its been into the mechanic, who has had the sump off checked the oil pump and finds no issue with it or the chain. Also the timing chain is OK, sump no sludge or broken guide rails etc.

He tells me all looks fine...not clear what the noise is and replacing the pump may not be the cause. We've removed the drive belt and the sound is still there so not the idler, ac or alternator!

https://m.youtube.com/watch?v=7G30lpTI9sw&t=1s

01-29-2024, 12:44 PM	#1
rukp Private 18 Rep 75 Posts Drives: 3 series GT 320- M sport Join Date: Feb 2015 Location: United Kingdom iTrader: (0)	UK f30 alternator and idler pully bolts - Torque to yield or Steel? Hi All, Per the title, anyone know if the bolts can be reused made of steel or are they torque to yield one time bolts.. Thanks rukp
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01-30-2024, 03:29 AM	#2
bishbosh Lieutenant Colonel 840 Rep 1,993 Posts Drives: F30 335d Join Date: Oct 2013 Location: Sheffield iTrader: (1) Garage List 2014 BMW 335d [0.00]	Checked newtis, they can be reused. Torque to 38Nm. __________________ if I've helped - an Appreciate would be, er, very appreciated!
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02-02-2024, 01:07 PM	#4
rukp Private 18 Rep 75 Posts Drives: 3 series GT 320- M sport Join Date: Feb 2015 Location: United Kingdom iTrader: (0)	So I went to replace the alternator, idler and belt today. To be sure it was one of these at fault. I removed the belt, so nothing on ac compressor or alternator. Started the car and Sods law! The noise is still there?! Am a bit stumped anyone got any pointers, may have to give it to mechanic but much happier to DIY... Thks Reply
	Appreciate 0 Quote

02-02-2024, 02:44 PM	#6
dholdi2 Private First Class 59 Rep 180 Posts Drives: F31 35d Join Date: Feb 2020 Location: Preston iTrader: (0)	I think I have read about cases of the crankshaft pulley failing, maybe have a look at that ?
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02-03-2024, 04:23 AM	#7
TurboWeasel Major 794 Rep 1,013 Posts Drives: BMW 330D Join Date: Nov 2022 Location: UK iTrader: (0)	That /\. With the belt removed, grab the crank pulley and rock it about. If there's excessive movement, the rubber dampener has failed....and that can take the main bearing behind it out if left like that for too long. What kind of noise are we talking about? Rattling? Whining? You can get a whine from cold for <1 minute which is probably the oil pump. Cold oil is more viscous so the pump has to work harder. Maybe get a cheap stethoscope from Amazon and start probing the engine to pin point the source of the noise. Worn out chain guides can make a scratching and/or plasticky rubbing noise.
	Appreciate 0 Quote

02-08-2024, 06:39 PM	#8
rukp Private 18 Rep 75 Posts Drives: 3 series GT 320- M sport Join Date: Feb 2015 Location: United Kingdom iTrader: (0)	Hi, this is the noise. Since this its been into the mechanic, who has had the sump off checked the oil pump and finds no issue with it or the chain. Also the timing chain is OK, sump no sludge or broken guide rails etc. He tells me all looks fine...not clear what the noise is and replacing the pump may not be the cause. We've removed the drive belt and the sound is still there so not the idler, ac or alternator! https://m.youtube.com/watch?v=7G30lpTI9sw&t=1s
	Appreciate 0 Quote