Will an SD1 waterpump with screw-on viscous fit a P6b?

jp928

jp928

Well-Known Member
Has anybody looked at this possibility? The viscous fan on P6B has 13 blades, the hole in the radiator cowling is 460mm dia. The Fan I have (Discovery) is 435mm dia, 11 blades, but they are quite a bit wider than the P6B viscous fan.. On the viscous coupling the assembly is 70mm deep. The coupling is ETC1260, the fan is ETC1275. Could end up cheaper than a ERC2810 these days as long as the fan finishes up the right depth into the shroud. Pretty sure these viscous units are designed to lock up (drive) based on temp coming along the pump shaft, rather than rev limiting. The only caveat is that on a Disco, after lots of heat cycles the fans are known to start cracking, and occasionally shed a blade.
Pic is a Disco fan and viscous adapted to a 928 fan shaft, by cutting the male LH thread part off a Disco pump, pressing it onto the 928 shaft.
On looking at an SD1 pump (early type with viscous bolted onto the shaft like a P6B) the snout looks much longer...?
 

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Sounds like it's worth a try if you don't have to butcher the water pump, could you make up some kind of spacer if the fan isn't far enough into the shroud?
I don't suppose it makes a difference but isn't it hot air from the radiator on the finned aluminium centre that governs the amount of slip?
 
Hi, Be careful of the length of the pump a P6b pump is 125mm long and is commonly known as a short nose pump. I have here an Sd1 pump with the screw on viscous fan fitting and that's 150mm. The P6b pump is already perilously close to the rad. So unless your market has a different set up I'm not sure it will be suitable. Land Rover products have a lot more room between engine and rad.

Colin
 
Us down south need a lot more than the std fan used in UK, Europe, to keep temps under control. The viscous , when its a std fitting, is very easy to fit, and the screw on unit is a breeze. I know people have fitted electric fans in the P6B, but its pretty tight.
 
jp928 said:
Us down south need a lot more than the std fan used in UK, Europe, to keep temps under control. The viscous , when its a std fitting, is very easy to fit, and the screw on unit is a breeze. I know people have fitted electric fans in the P6B, but its pretty tight.
Click to expand...

I did a whole thread on an electric fan fit. It's actually pretty easy. Essentially you need the right fan - a huge but relatively thin Spal one which sweeps a large part of the radiator and use a 2 speed switch. It's a myth that you need one on those megawatt fans aimed at classic cars. I reckon running it at around 80 watts is enough at 37-38 degrees - never heard the high speed kick in.
 
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