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Omega Help Area => Omega General Help => Topic started by: SR-71Blackbird on 27 October 2013, 12:37:45

Title: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: SR-71Blackbird on 27 October 2013, 12:37:45
Hi all,

Trying to undo the 32mm part and i know its a left hand thread so Ive got my wrench on the bolt and I am turning it in a clock wise manner as I stand at the front of the car looking towards the back.

I ve turned it several times now (repositionin the wrench) and it just turns, no loosening or change.

What am I doing wrong and any tips you can give me?

Thanks

Alex
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: Elite Pete on 27 October 2013, 12:43:21
Give the wrench a tap with a persuader ;)
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: 05omegav6 on 27 October 2013, 12:43:33
Don't mind me ::) was about to be daft :-[
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: SR-71Blackbird on 27 October 2013, 12:51:33
But it just spins and spins, I can move it round but i doesn't do anything
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: Seth on 27 October 2013, 13:21:51
Give the wrench a tap with a persuader ;)

And if that fails ... a damn good sharp clout with a lump hammer! :y
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: TheBoy on 27 October 2013, 13:37:08
Assume that its slipping on the belt.

A sharp shock (ie, belting spanner with a mallet) sometimes helps, failing that, try wedging the waterpump still via its pulley. Be careful not to damage pulley (or shear pulley bolts if using a spanner on them to wedge)
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: Andy B on 27 October 2013, 13:39:42
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: TheBoy on 27 October 2013, 13:42:52
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Nope
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: Andy B on 27 October 2013, 14:04:10
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Nope

HTF are you meant to hold the viscous bit then?  ??? ???
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: SR-71Blackbird on 27 October 2013, 14:10:24
OK Ive removed the pulley bolts, 4 of them, and will try and get the fan bit off the pulley and out of the way and then hopefully remove the bolts and work on the pump but the viscous fan has slowed me down hugely
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: TheBoy on 27 October 2013, 14:40:48
OK Ive removed the pulley bolts, 4 of them, and will try and get the fan bit off the pulley and out of the way and then hopefully remove the bolts and work on the pump but the viscous fan has slowed me down hugely
Why have you removed the 4 pulley bolts at this stage? The fan has to come off first.
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: TheBoy on 27 October 2013, 14:41:54
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Nope

HTF are you meant to hold the viscous bit then?  ??? ???
You can't. BMW design, remember. The Germans cannot design anything.
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: TheBoy on 27 October 2013, 14:43:48
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Nope

HTF are you meant to hold the viscous bit then?  ??? ???
You can't. BMW design, remember. The Germans cannot design anything.
The key here is to stop waterpump pulley rotating as you undo the fan's nut. The aux belt tension alone is often insufficient. Short, sharp knocks often does it, else you end up being creative with using spanners as pulley locking tools.
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: Andy B on 27 October 2013, 14:48:43
Isn't there a nut at the back of the fan to hold like on a Senator's viscous fan?  :-\
Nope

HTF are you meant to hold the viscous bit then?  ??? ???
You can't. BMW design, remember. The Germans cannot design anything.
The key here is to stop waterpump pulley rotating as you undo the fan's nut. The aux belt tension alone is often insufficient. Short, sharp knocks often does it, else you end up being creative with using spanners as pulley locking tools.

Sounds well thought out then! I suppose you have to use your 'fan belt' like a oil filter (canister type) strap (http://www.ebay.co.uk/itm/DRAPER-43863-2-PIECE-OIL-FILTER-STRAP-WRENCH-REMOVAL-TOOL-/150985860713?pt=UK_Hand_Tools_Equipment&hash=item2327756669)
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: omegod on 27 October 2013, 18:11:02
I volleyed one off a BMW petrol, got the fan tool standing upright and leather it clockwise, there is a tool for the petrol ones
that holds the fan still so surprised there isn't one for the wiesel engine.

http://www.ebay.co.uk/itm/BMW-Pulley-Holder-Viscous-Fan-Tool-/151064314160?pt=UK_Hand_Tools_Equipment&hash=item232c228130
Title: Re: Cant get the viscous fan off the TD, I know its a left hand thread
Post by: SR-71Blackbird on 27 October 2013, 18:58:34
OK job done, thanks very much to JamesV6CDX, great job :)