Shortened Water Pump

I should point out that the pump in the article is a Buick pump and not a Rover pump, although the footprint of each is the same. The P6B water pumps have the shortest nose of any water pump fitted to the Buick / Rover V8. The only variation is in the fan and its attachement. The depth of the steel fan once fitted to the pump is somewhat greater than the 13 bladed nylon fan running on a viscous coupling. The latter is far more efficient, both moving a greater volume of air per revolution along with being speed limited to 2500rpm thus reducing the engine's fuel consumption at revs exceeding that figure.

The nylon fan with viscous coupling came fitted as standard on all CKD New Zealand assembled Rover 3500 sold in Australia. The U.S NADA cars and I am guessing here those sold to Middle Eastern destinations may well have had them as well. Although the U.S might not necessarily be classified as a hot country, both Australia and Saudi Arabia etc are.

Ron.
 
Question -
Are the A/c cars fitted with short or long nose water pump? .
Mine is grumbling away.
My P6b has the viscous unit with nylon blades.
I have locked water pump GWP310 short nose in my cart.!!
Dont want to blow money on the wrong one.
 
Just found the answer to my own question .
A root around in some boxes of P6 spares I kept for " Just in case" - a NADA water pump and viscous coupling.
Its 2nd hand -so how do I bench test it before I take my sus. pump off?
 
GRTV8 said:
Just found the answer to my own question .
A root around in some boxes of P6 spares I kept for " Just in case" - a NADA water pump and viscous coupling.
Its 2nd hand -so how do I bench test it before I take my sus. pump off?
Click to expand...

Hi Gerald,
All you can really do is feel for play in the bearing. A twizzle is probably ok but anything more than that is not too good. How easily does the impeller turn?

Ron.
 
Hi Ron
Cant beat a good twizzle.
Bearing runs nicely concidering its been sitting in my shed for 10yrs. That how come I forgot I had it. My recall is only good for three years.
The waterways are clean as a whistle so cant have been that old when removed.
Dont know the history.Basicaly bought it for the viscous coupling as it was a rarity in NZ from year dot.
 
Hi Gerald,

Well that all sounds very positive, you may well be lucky then and the seal will be fine. The best ones (there are different types that I have seen) have a ceramic washer recessed into the rear of the impeller. There is a stiff spring in there as well that maintains pressure on the carbon graphite seal pushing it against the ceramic washer once in situ.

Look forward to hearing how she goes!

Ron.
 
Not so much about the pump, but...viscous couplings should be stored vertical, ie shafts horizontal. If they dont seem to lock up and drive the fan when hot, you may be able to save it by refilling the silicon inside. Toyota sell small bottles in 2 grades of viscosity. There is usually a way to expose a hole in the font (under the spring below) - quickest way to refill is push in with a small syringe, dripping takes forever. Note that the nylon fan shown is prone to cracking at blade root and failing when worked hard in hot climates - eg Saudi!
0DCWYt0.jpg

jp
 
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