Diesel Crankshaft Pulley Noise

Synchromesh · 27th January 2014, 16:55

My manual diesel saloon has done about 95000 miles. Last Friday I encountered crankshaft pulley noise for the first time. I sprayed the alternator belt with belt dressing and the noise stopped immediately. I did about 70 miles over the weekend and the noise did not return. The noise started again today when the engine was cold but disappeared when the engine warmed up. Does the pulley always need replacing once the noise has started or can uneven forces from a dry belt twist a good pulley thus inducing the noise?

T-Cut · 27th January 2014, 16:59

Quote:

Originally Posted by Synchromesh

Does the pulley always need replacing once the noise has started - - - -

Belt dressing won't fix this I'm afraid.

TC

Synchromesh · 27th January 2014, 17:05

Quote:

Originally Posted by T-Cut

Belt dressing won't fix this I'm afraid.

TC

I agree that if my pulley is disintegrating then it needs changing but why does warming the engine up or spraying with belt dressing stop the noise?

FrenchMike · 27th January 2014, 17:15

Don't wait ....

T-Cut · 27th January 2014, 17:16

The noise is created by the two sections of the pullet striking each other. They can only do that when the rubber interleaf is failing. The noise usually quietens when the interleaf is lubricated with water, etc, or the revs are increased. Engine temperature will have an effect in the early stages but it's down hill from there. I've heard reports of a pulley disintegrating and the outer ring being ejected at light speed. It's a sooner rather than later thing really.

TC

Synchromesh · 27th January 2014, 17:37

How long does it take to change?

DMGRS · 27th January 2014, 18:31

It depends how seized the bolt is - some have come off quite easily, others have had to really fight to get it off.
I have a quality aftermarket (not to be confused with the quick-failing cheap items other members have had issues with) or the OEM item here:
Crank Pulley - CDT

Mine wasn't too bad to get off, thankfully. Hopefully yours will be the same.

rovexCDTi · 6th February 2014, 14:23

Since i had my engine changed ive noticed quite alot of 'diesely' noise coming from the crank pulley end. Its just like a loud engine with an extra bit of tappety ticking. Seems worse at idle but doesnt seem affected by temperature a such.

Does that sound like the pulley? Ive ordered one anyway, it cant hurt to change it.

I think they reused my old pulley, so it may not have liked being moved.

DMGRS · 6th February 2014, 14:50

Sounds like it could well be - I guess you'll know soon!

Mike Noc · 6th February 2014, 16:08

Quote:

Originally Posted by rovexCDTi

Since i had my engine changed ive noticed quite alot of 'diesely' noise coming from the crank pulley end. Its just like a loud engine with an extra bit of tappety ticking. Seems worse at idle but doesnt seem affected by temperature a such.

Does that sound like the pulley?

Have a listen here:

www.youtube.com/watch?v=70riNMXBrZU

27th January 2014, 16:55	#1
Synchromesh Gets stuck in Rover 75 Saloon Join Date: Jan 2010 Location: Preston Posts: 624 Thanks: 50 Thanked 44 Times in 32 Posts	Diesel Crankshaft Pulley Noise My manual diesel saloon has done about 95000 miles. Last Friday I encountered crankshaft pulley noise for the first time. I sprayed the alternator belt with belt dressing and the noise stopped immediately. I did about 70 miles over the weekend and the noise did not return. The noise started again today when the engine was cold but disappeared when the engine warmed up. Does the pulley always need replacing once the noise has started or can uneven forces from a dry belt twist a good pulley thus inducing the noise?

27th January 2014, 18:31	#7
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	It depends how seized the bolt is - some have come off quite easily, others have had to really fight to get it off. I have a quality aftermarket (not to be confused with the quick-failing cheap items other members have had issues with) or the OEM item here: Crank Pulley - CDT Mine wasn't too bad to get off, thankfully. Hopefully yours will be the same. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

6th February 2014, 14:23	#8
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	Since i had my engine changed ive noticed quite alot of 'diesely' noise coming from the crank pulley end. Its just like a loud engine with an extra bit of tappety ticking. Seems worse at idle but doesnt seem affected by temperature a such. Does that sound like the pulley? Ive ordered one anyway, it cant hurt to change it. I think they reused my old pulley, so it may not have liked being moved. __________________ [SIGPIC][/SIGPIC]

6th February 2014, 14:50	#9
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Sounds like it could well be - I guess you'll know soon! __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

27th January 2014, 17:15	#4
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	Don't wait ....

27th January 2014, 17:16	#5
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The noise is created by the two sections of the pullet striking each other. They can only do that when the rubber interleaf is failing. The noise usually quietens when the interleaf is lubricated with water, etc, or the revs are increased. Engine temperature will have an effect in the early stages but it's down hill from there. I've heard reports of a pulley disintegrating and the outer ring being ejected at light speed. It's a sooner rather than later thing really. TC

27th January 2014, 17:37	#6
Synchromesh Gets stuck in Rover 75 Saloon Join Date: Jan 2010 Location: Preston Posts: 624 Thanks: 50 Thanked 44 Times in 32 Posts	How long does it take to change?