Mud-club

Vehicle & Technical => Defender => Topic started by: frosty on January 27, 2010, 20:12:40

Title: removing a fan/viscous unit..
Post by: frosty on January 27, 2010, 20:12:40

   Hi all,

    Ive diaganosed my over heating problem as a failed viscous unit but now i need to take it off, ive got a 32 mm spanner for the nut on the end but i was wondering how to stop the unit turning..

 any ideas?

Title: Re: removing a fan/viscous unit..
Post by: Axetamer on January 27, 2010, 21:03:42

stick a big allen key, drill,  screwdriver, bit of bar or whatever in one of the holes in the pulley to stop the whole lot turning when undoing the coupling

Title: Re: removing a fan/viscous unit..
Post by: 300TDi Disco on January 27, 2010, 21:29:25

Are they reverse thread???

Title: Re: removing a fan/viscous unit..
Post by: crazymac on January 27, 2010, 21:43:47

Quote from: V8defender90 on January 27, 2010, 21:29:25

Are they reverse thread???

Yes, left hand thread

Title: Re: removing a fan/viscous unit..
Post by: richo on January 27, 2010, 21:45:59

No they are not as iv'e just had mine off [td5].My mate told me to give the spanner a light tap first with a hammer.
They do seize up sometimes.
I jammed a big screw driver between the nut and levered it down againsted the screws on the pully wheel.

Title: Re: removing a fan/viscous unit..
Post by: richo on January 27, 2010, 21:47:36

Yes left hand thats what i ment as as normal with most nuts and bolts

Title: Re: removing a fan/viscous unit..
Post by: extreme90 on January 28, 2010, 17:35:03

all tdis are left hand thread so need turning clockwise to undo
td5 engines are normal right hand thread so need undoing anticlockwise
i never bother locking them off, a quick blow with a 2lb lump hammer shocks them undone

Title: Re: removing a fan/viscous unit..
Post by: Range Rover Blues on January 28, 2010, 23:35:41

The serpentine V8 is RH thread, all other 8s and TDi are LH thread.  I don't know about TD5.  I do know that the RH thread viscous fans have a smaller nut.  If it spins when you tap it with a ahmmer than try tightening the belt with a clamp or large mole grip.

Title: Re: removing a fan/viscous unit..
Post by: age on January 29, 2010, 00:22:27

TD5 is normal 'undo anticlockwise'.

Shock with lump hammer worked for me.  Take out one of the pulley bolts to get a swing with the spanner.

Do remember not to lie the new unit down flat - must stand upright or the viscous lock won't work. A

Title: Re: removing a fan/viscous unit..
Post by: Range Rover Blues on January 29, 2010, 22:29:22

I did not know that, they are supposed to be self-priming once fitted :-k

Title: Re: removing a fan/viscous unit..
Post by: frosty on January 31, 2010, 19:52:22

Quote from: age on January 29, 2010, 00:22:27

TD5 is normal 'undo anticlockwise'.

Shock with lump hammer worked for me.  Take out one of the pulley bolts to get a swing with the spanner.

Do remember not to lie the new unit down flat - must stand upright or the viscous lock won't work. A

  thats a worry, i had my mine delivered..i hope the courier knew this aswell! lol

Title: Re: removing a fan/viscous unit..
Post by: age on February 01, 2010, 11:11:12

I was told this for 'storing' mine for nearly a month while I was doing the head in my spare time - I'd guess lying down on the delivery run would be acceptable!!  :D  A