M54 engine viscous fan. Not sure if I have an issue.

[Mint]

@Pond, if you do change the viscous coupling don't forget that the big nut is a left hand thread.

 

[Ianmc]

Why not delete the viscous fan, it doesn't seem to be needed? Or just leave as is.
Whilst no real comparison, my M44 only has the electric (aircon) fan and has no other fan installed from factory.

 

[Nodzed]

The M54 primary cooling was by viscous, if it didn't have AC the electric fan wouldn't be fitted. Always better to have both systems if they are there, always a back up if the primary fails, I deleted the viscous on my M, under normal and vigorous driving all was OK, but under prolonged high revving very vigorous driving the electric fan didn't cope well, hence I put it back. I would leave things as Mr. BMW designed it, I'll wager he knows better than us.

 

[Pond]

I have ordered a new viscous coupling (£40).
I noticed there are several 'versions' available; some say they are for 'hot climates' and some also say they are for 'no electric fan', even though realoem only gives one part number.
I can only presume the bimetallic strip on some move at different temperatures to others??

I have ordered a 'generic' one with the correct part number, so let's hope it makes a difference.

 

[Nodzed]

I have ordered a new viscous coupling (£40).
I noticed there are several 'versions' available; some say they are for 'hot climates' and some also say they are for 'no electric fan', even though realoem only gives one part number.
I can only presume the bimetallic strip on some move at different temperatures to others??

I have ordered a 'generic' one with the correct part number, so let's hope it makes a difference.

If you don't have a set I would highly recommend getting one. Makes the job a lot easier.
And as Mint said, its Lefty Tighty Righty Loosie

Viscous Spanners