Rattling noise on shutdown

[DaveK]

Over the last week or so I have noticed I sometimes have a kind of 'rattling' noise when I switch off the ignition. It's not always there and definitely is after the engine has stopped. Sounds a bit like a piece of wood rattling around somewhere.

I've done a visual inspection and see nothing obvious. The sound seems to come from the very front of the engine bay so I am thinking it's probably a cooling fan bearing or similar on the way out? If that's the case how am I fixed for a replacement fan?

Anyone have any other ideas of what it might be?

Thanks

[Scrrem]

Over the last week or so I have noticed I sometimes have a kind of 'rattling' noise when I switch off the ignition. It's not always there and definitely is after the engine has stopped. Sounds a bit like a piece of wood rattling around somewhere.

I've done a visual inspection and see nothing obvious. The sound seems to come from the very front of the engine bay so I am thinking it's probably a cooling fan bearing or similar on the way out? If that's the case how am I fixed for a replacement fan?

Anyone have any other ideas of what it might be?

Thanks

It could be your dual mass fly wheel dampers going bad. How many miles on the car?
Rich

[DaveK]

Thanks Rich. 100,000 km/60,000 miles.

Wouldn't the flywheel damper sound more as if it were inside the cockpit or close to the bulkhead?

[Scrrem]

Thanks Rich. 100,000 km/60,000 miles.

Wouldn't the flywheel damper sound more as if it were inside the cockpit or close to the bulkhead?

Sorry Dave, I should have read you post more carefully :redface: I suppose it could be the cooling fan bearing. Have you checked your idler pulley? I had a strange knocking sound that my 90 made with the enging running. It ended up being a water pump bearing. I never heard a water pump bearing knock like this one did.
Rich

[DaveK]

I'll check it but this is happening after the engine has stopped so I don't think the idler or water pump would be still turning.

Thanks!

[Ccmano]

Dual-mass flywheel... mine does it too. If you ever watch closely at the moment when an engine comes to a stop, the piston compression causes it to come to an abrupt stop or even a slight backwards rotation. This causes the flywheel to occilate a few times if the damper mechanism is shot. BTW mine has 61K miles on it. Seems to work fine otherwise. I'm just waiting for more of a reason before I go to all the work of dropping the trans to replace the flywheel and clutch. I have a low mile D/M flywheel sitting on my work bench waiting to that day.
H