Sutty2006 Posted July 15, 2020 Share Posted July 15, 2020 I’ve got an early 2.0 CIH and it’s got a fixed fan on the water pump not a viscous. Can I fit a viscous water pump to it without issue? Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 15, 2020 Share Posted July 15, 2020 If your going to change it, why not go electric? Viscous of that age won’t be very reliable imo Quote Link to comment Share on other sites More sharing options...
hoobby Posted July 15, 2020 Share Posted July 15, 2020 (edited) If you really want viscous you will have to change the water pump to take the viscous coupling with the additional cost might be worth looking into electric unless you want the standard look Not sure but the fan blades might be different as well blades have a more aggressive pitch ?. Edited July 15, 2020 by hoobby Quote Link to comment Share on other sites More sharing options...
Sutty2006 Posted July 15, 2020 Author Share Posted July 15, 2020 Fan looks very different. I’ve got electric on my 16v operated by a switch on the dash and it’s fine but somewhere I’ve got a NOS 1800 viscous unit. Unsure if they are interchangeable but worth a look if I can find one. If the viscous water pump will fit then then I’ll fit one. Solid fans are crap lol Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted July 15, 2020 Share Posted July 15, 2020 (edited) hi. the early viscous fan unit can be fitted straight onto your existing waterpump .it is a boss that fits in place of the plastic fan and then the viscous hub slides onto that and held with a left hand thread allen bolt.probably hard to find a boss now .varous early senators and monza,royale used them if you could find one.the fan is easier to get as a lot of cars in the 70's used a similar setup and the viscous units are still available albeit not cheap.they are just a basic viscous design thou,no variable speed at hotter temp just a basic slip. the later units did use a different waterpump drive flange and the fan unit screws to it .they are temperature controlled and were found on various other vauxhalls such as carlton mk1 & 2,,senator etc,and no doubt other cars too(this waterpump is a direct replacement as a whole ) both my cavs have the standard fixed fan in place and never had any issues. the fan isnt too loud at high revs ( sounds nice anyway in my opinion!)and removing it once for a viscous type made no obvious differences power or economy wise albeit a slight reduction in noise.also as far as i can remember the radiator needs moving to the other mounting points too but thats only bottom bolt and two rubbers. other way to go is electric but thats not for me ! Edited July 15, 2020 by cam.in.head 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 15, 2020 Share Posted July 15, 2020 2 hours ago, Sutty2006 said: Fan looks very different. I’ve got electric on my 16v operated by a switch on the dash and it’s fine but somewhere I’ve got a NOS 1800 viscous unit. Unsure if they are interchangeable but worth a look if I can find one. If the viscous water pump will fit then then I’ll fit one. Solid fans are crap lol Get a boss put into your rad and use thermal switch for it Quote Link to comment Share on other sites More sharing options...
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