Viscous Fan Hub

My advice would be if you think that the fan clutch is not working to raplace it. If it is low on fluid it most probably has a leak and topping up will just prolong the inevitable. I am fairly shure that the Nissan unit is sealed and cannot be topped up. Apart from the amount of fluid in the unit other things can go wrong, I have seen near new clutches that will not engage but are not low on fluid.
Regards Ken.

G'day Laddie,
When I did mine a coupla yrs ago (I had 'suspected' that it _may_ not have been working as efficiently as it should), I used 1x 18ml tube (Toyota part# 08816-10001 , less than 10 bucks at the time).....
'Yota parts bloke said "ya might need 1, or ya might need 2", so I bought 2, used 1 & it's working just fine & I haven't touched it since:-))

I didn't clean out or remove any of the existing stuff, just added the 18ml & put it back together, & like I said, it's working just fine..... (YMMV)

Regards,
Ed. C.

Hi Boy

I have been re-filling these fan hubs for years and that includes the sealed ones that required 2 holes drilled and then pressure filled and sealed again with snap off blanking screws.

1 bottle of Toyota silicone oil will do the job but make sure to wobble the hub before removing it from the vehicle. If there is play in the hub replace it. While there check for signs of play or weepage on the waterpump shaft and replace it while you are busy.

Regards Derek

I think you will find that if you put enough fluid in they will always drive, but will not idle when cold, you might as well fit a solid drive fan.
Regards Ken.

Yeh,
trial and error on my Patrol. Too much fluid and they will not cut out at all- when I first did mine I added too much, but after about three removal/ disassembly exercises removing some fluid each time it now works a treat.
Cheers

Thanks All for your replies, I have been doing some searching through the archives of this site on issues of running hot Patrols. many Thanks to people like Roachie for posting his finding and replacement items on his Patrol to try and cure this problem. Although after reading whats on Roachie vehicle "gadgets and gizmos" I think he needed to upgrade the turbo just to carry the extra weight....lol.
Bought the Patrol new in 01 and has always run hot under load "towing Camper Trailer" so I have learnt to drive using the water temp gauge. (VDO Gauge on dash)

After searching through the archives for some time and many posts I see that this problem has not been resolved yet, Im not interested in getting the old girl to run at 80deg under any load but I am interested to see if I can bring the temp down by 5 to 10 deg if possible. I guess I would like to strike a balance between the temp and the budget, make the changes but be cost effective.

I have fitted a new 3" exhaust and dump pipe to the bus and was amazed by the increase in the bottom end, from the 1000 to 1500 rpm range is a hell of a lot better. Will be looking at the turbo upgrade as soon a the budget can spare it hence my reason why I would like to knock the edge of the temp a little.

Have heard that the new Patrols run a higher pressure radiator cap in an attempt to cure this problem but from what I have seen on the net the new Patrol still run hot. I recall Holden did the same thing on the Commodores but did not upgrade the water heater inside the car, some major leaks occured inside the commodores. Hope nissan didnt make the same mistake haha

Thanks again all

The Boy

I had heating problems on my GQ the other week with the heatwave in Adelaide bringing out the problem.
NATRAD fixed the problem fine and they said that they put "two tubes" of lube in (sorry but I don't know how much that was). Running much cooler now!
Sorry it doesn't really answer your question but for the sake of a couple of hundred dollars (or less as I had a flush and fluid change as well) it could be worth just giving the car to a radiator place to do.

Cheers,

I put 18 mls in my GU 4.2D before christmas, should have only put 10 mls as fan runs too hard too often. Also fitted latest radiator cutout switch for the Aircon clutch and that stopped cutting the A/C out so early. Uses a bit more fuel with the 18mls but on long hills with big trailer in western qld at speed limit it doesn't get warm now, only when you are ringing its neck in 3rd going up the Canarvons and ranges like that when over 40c.