Water pump and viscous coupling

SydneyRoverP6B

SydneyRoverP6B

Well-Known Member
Staff member
I am led to believe that the series 2 3500 sold in the U.K came as standard with a metal engine fan and no viscous coupling. The models fitted with the viscous coupling being the 3500S. Is this correct?

In Australia, all series 2 3500 and 3500S whether equipped with air conditioning or not came as standard with the 13 bladed nylon fan and viscous coupling.

All the P6B waterpumps that I see on ebay are configured for the metal fan. My local Rover parts supplier buys in new QH pumps, removes the nose designed for metal fan fitment, and fits the correct piece to accomodate the viscous coupling.

Thanks in advance
Ron.
 
Ron, to the best of my knowledge no 3500s came with a viscous coupling, my three 3500Ss all have 4 blade metal fans fitted.
Regards,
Dave
 
The only UK and Europe P6's to have the viscous coupling and plastic fan were those fitted with A/C. Also NADA 3500S. Why not use pumps from the SD1 which did have the viscous as standard.

Chris
 
chrisyork said:
Why not use pumps from the SD1 which did have the viscous as standard.Chris
Click to expand...

IIRC although the footprint of the SD1 pump is the same, it has a longer nose and so doesn't line up with the other pulleys, and because of this the fan fouls the rad.
 
dmcsweeney said:
Ron, to the best of my knowledge no 3500s came with a viscous coupling, my three 3500Ss all have 4 blade metal fans fitted.
Regards,
Dave
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I am sure all of mine came with a 5 blade metal fan but they were not equally spaced.

I could be wrong.

If this non equal spacing is there to create a balance, I have to ask if removing it will create an out of balance water pump?
 
quattro said:
I am sure all of mine came with a 5 blade metal fan but they were not equally spaced.
I could be wrong.
Click to expand...

No, you're right, and when you look at them you wonder how they could ever be in balance. They have 4 equally spaced bolt holes, but a small dowel to make sure they can only be fitted in the correct position. Early ones had a curve in the end of the blades as well.
 
Why is the metal fan assymetric? I wondered why it looks sort of like a cross between a fan and a boomerang?
 
Got to be a balance thing...but when I first looked I thought it had got to be bent! Sure it's not...but weird! Good old Rover :D
 
Thanks gents for the informative replies.. :D

So the 5 blades on the metal fan are not equally spaced. Why would that be? Rover did the same with the tailshaft,...the yokes at each end are not in phase, where as in the vast majority of taishafts, they are.
They have to be designed thence balanced in that configuration.

Ron.
 
The fans are in fact balanced. The assymetric blade placing is intended to eliminate any possiblity of "thrummimg" at particular engine speeds, which is possible with symmetrical fan blades.

Chris
 
SydneyRoverP6B said:
All the P6B waterpumps that I see on ebay are configured for the metal fan. My local Rover parts supplier buys in new QH pumps, removes the nose designed for metal fan fitment, and fits the correct piece to accomodate the viscous coupling.
Ron.
Click to expand...
I'm in the market for a viscous coupling. Would one from Oz be prohibitively expensive to be shipped over I wonder?
Has your supplier got a weblink Ron?
 
The Rovering Member said:
SydneyRoverP6B said:
All the P6B waterpumps that I see on ebay are configured for the metal fan. My local Rover parts supplier buys in new QH pumps, removes the nose designed for metal fan fitment, and fits the correct piece to accomodate the viscous coupling.
Ron.
Click to expand...
I'm in the market for a viscous coupling. Would one from Oz be prohibitively expensive to be shipped over I wonder?
Has your supplier got a weblink Ron?
Click to expand...

Hello The Rovering Member,

New water pumps are one thing, but unfortunately viscous couplings for the P6B are something else altogether. I have not seen a new one for sale locally for a good 20 years. They do have other ones though, which may or may not fit ( Discovery, Range Rover ).

Here is a link to the business, which is called TR Spares.

http://www.trspares.com.au/

Ron.
 
Thanks very much Ron. Actually, I worded that completely wrong. I have a viscous set-up on my aircon V8 & the pump has gone so I just need a new pump. I'd have to ask them if a modified pump was sent over to me would I be able to finish it off myself. Sounds as though it's just the pump thats worked on & the viscous coupling bolted to it. I know nothing about them, this is my first v-c. I've not really looked at it other than to notice the spray of water droplets fanning out around the engine when she's running.
 
chrisyork said:
The fans are in fact balanced. The assymetric blade placing is intended to eliminate any possiblity of "thrummimg" at particular engine speeds, which is possible with symmetrical fan blades.
Click to expand...

It's common to find this sort of fan on building air plants, diesel electric locos and industrial equipment where fan noise is a problem. Rover were obviously concerned about fan noise as both the curved tips and assymetric blades were uncommon when they were first used on the P6B
 
The Rovering Member said:
Thanks very much Ron. Actually, I worded that completely wrong. I have a viscous set-up on my aircon V8 & the pump has gone so I just need a new pump. I'd have to ask them if a modified pump was sent over to me would I be able to finish it off myself. Sounds as though it's just the pump thats worked on & the viscous coupling bolted to it. I know nothing about them, this is my first v-c. I've not really looked at it other than to notice the spray of water droplets fanning out around the engine when she's running.
Click to expand...

Hello The Rovering Member,

The piece on your waterpump that is pressed onto the shaft from the pump bearing needs to be removed. If you purchase a new QH pump modified by TR Spares to accept the viscous coupling, you could post the afore mentioned piece to them which they would fit and send you the pump complete, or just explain the situation to them and fit the piece yourself (if you have a suitable press) once the pump is received.

What I do is provide them with an old failed pump, they remove the piece from that and then that is fitted to a new pump.

They are an excellent business. I have been buying from them for over 20 years. They do reconditioned P6 steering idlers too, which are excellent. Micheal or Scott are the gents to talk to.

Best of luck,
Ron.
 
The Rovering Member said:
SydneyRoverP6B said:
New water pumps are one thing, but unfortunately viscous couplings for the P6B are something else altogether. I have not seen a new one for sale locally for a good 20 years. ).


Ron.
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http://cgi.ebay.co.uk/Rover-P6b-New-Rar ... dZViewItem

Rare but very expensive.
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Ah, but that auction is for a VISCOSE coupling. And how rare would that be...made from wood pulp, no less :D
 
Gentlemen,

The reason for assymetric blades is to cut down on noise, as the fan spins the speed at the tip can reach very high speeds and turbulance which can be hit by the following blade which creates if you like a bang so the faster the fan goes the more times the next blade can hit the previous fans wake, by setting the gaps unequally this stops, to a degree, the noise being created. If you look at any modern kit with a fan in you will see od pattern fans, even hair driers or alternator fans.

Martin P
 
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