Paul (Notts)
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 posted on 5/3/05 at 04:20 PM |
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Rover v8 Viscous coupling removal
Just started stripping down a 1988 3.5 efi rover V8 engine, which I intend to rebuild.
I may be thick but I am puzzeled by How to remove the fan and Viscous coupling from the water pump.It appears to have a wound spring on the fromt of
the viscous coupling and four bolts on the back which presumably hold the fan to the coupling.
How do I remove them from the pump????
Thanks
Paul
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rusty nuts
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| posted on 5/3/05 at 04:47 PM |
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Not sure but is there a large hexagon betwwen the 4 bolts and the viscous coupling? if so it has a left hand thread . If you don't intend using
it again just put a bluntish chisel close to edge of hexagon and give it a sharp tap so that it rotates anticlockwise, this usually undoes viscous
couplings .H.T.H. Rusty
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mark_UK
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| posted on 5/3/05 at 05:24 PM |
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If its the same set up as Fords theres a thin nut behind the viscous unit which needs a very thin,cranked spanner to undo, on fords its either 32 or
34mm cant remember which.Any car spares shop selling Laser brand tools should have one.
[Edited on 5/3/05 by mark_UK]
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white130d
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| posted on 5/3/05 at 09:31 PM |
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Yep
Unscrew the big nut behind the fan..and it is backwards threaded....
David
"There's only 2 things that money can't buy, and that's true love and home grown tomatos" Guy Clark
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Paul (Notts)
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| posted on 5/3/05 at 09:38 PM |
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How do i stop the pump turning wnen i do this
thanks
paul
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Simon
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| posted on 6/3/05 at 12:28 AM |
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Leave the fan belt on?
ATB
Simon
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clbarclay
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| posted on 6/3/05 at 08:10 AM |
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And if it then carries on turning push in on the fan belt to tighten the belts grip.
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NS Dev
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| posted on 6/3/05 at 09:18 AM |
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quote:
Originally posted by rusty nuts
Not sure but is there a large hexagon betwwen the 4 bolts and the viscous coupling? if so it has a left hand thread . If you don't intend using
it again just put a bluntish chisel close to edge of hexagon and give it a sharp tap so that it rotates anticlockwise, this usually undoes viscous
couplings .H.T.H. Rusty
Or just follow Rusty's advice above, this has worked every time I have done this on Fords and RWD Opels, usually frees with one sharp tap, even
with no belt on at all.
[Edited on 6/3/05 by NS Dev]
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wilkingj
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| posted on 6/3/05 at 10:11 AM |
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I have just done this , and OFF the engine as well!..
You need the double ended Laser (make) cranked fan spanner, Its a LEFT HAND thread (Think first before undoing).
I have some bits of old seatbelt, I twisted it into like a rope, wound it round the pulley belt, then I twisted the two end round and round until it
tightened on the pulley, then I put the twisted tail of the belts in the vice, tightened and twisted it up as tight as I could get it.
Then put the spanner on and clouted it with a heavy hammer.
This is easier if you are a freak or a Indian goddess, 'cos three or more hands are a definate advantage here.
Comes undone failry easily, but needs a good clout with the hammer. IN THE RIGHT DIRECTION 
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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rusty nuts
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| posted on 6/3/05 at 05:21 PM |
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Why buy a spanner you are likely to use once? bet you already have a bluntish chisel , I would expect to have undone a viscous coupling using this
method before you have even found an old fan belt, seat belt or any other means of holding the pulley. One sharp tap is all it takes normally
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Peteff
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| posted on 6/3/05 at 05:55 PM |
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I belted mine with the chisel and broke the water pump end off. It's easy then, you just put the rotor in the vice, undo it and then buy a new
water pump. I don't know what rover v8 ones cost but pinto ones are about £10. 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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clbarclay
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| posted on 6/3/05 at 07:59 PM |
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Should have used the chisel and bust the water pump whalst I was changing the viscos unit on family range rover, the water pump died only 100 miles
later.
Diddn't need a special spanner for removing it, just an ordinary one. But then I do have a large selection of big spanners.
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