Fan oil

[GRASSMAN]

Hi all,

Changed the silicone oil in the fan over
the weekend, used ST10,000 it really
roars now, only problem now
is it keeps sucking pedestrians off the footpath.



Gman

[si tate]

Now your just being silly.

Maybe small puppies & roadants.

[BigBobE]

is this the viscous fan??? and where did you get the oil from???

[GRASSMAN]

is this the viscous fan??? and where did you get the oil from???

Hi Bob,

Yes the V fan, I got the oil from a radio control
model car shop, £3.99 per bottle (used 2) maybe
ST10,000 is a little over the top but it works.
Hope this helps.

Gman.

[GRASSMAN]

Now your just being silly.

Maybe small puppies & roadants.

NO!!!, IF they don't let go of the lead, IN they go!!!
(note to self) must clean the red stuff off the drive,
hope it's not A.T.F. Just can't be bothered looking for
another leak!!

Gman.

[TonyN]

I replace the 3000 with 5000, and adjust the drive plate so it comes online at lower rad temps, but didn't want the push the noise or drag on performance to far, especially with other peoples trucks.

Post up if you notice any MPG dent or other issues over time.

You can be the guinea pig.

[hellmett]

adjust the drive plate so it comes online at lower rad temps

What's this mean Tony?

I thought the fan ran constantly?

[TonyN]

Nope, its far more interesting than people think, there is a bi-metal spring on the front of the hub, the hotter the rad gets, it unwinds (or winds up, I dunno which) opening a valve, letting oil circulate around the hub drive rings, by opening more rings to oil, it slips less as each ring fills up with oil (there are 4 of them) so in effect its got 4 'speeds'.

You can adjust this valve, so the valve opens at lower temps, by adjusting two screws in slots inside the hub.

ST10,000 is a little over the top but it works.

You know Toyota list a 10,000Cst silicone oil, so its not that over top, just don't know of it being used stock on any fan.

(I have the part number somewhere, but its cheaper to get it from model shops in bigger bottles.)

[Overland Tonka]

I replace the 3000 with 5000, and adjust the drive plate so it comes online at lower rad temps, but didn't want the push the noise or drag on performance to far, especially with other peoples trucks.

Post up if you notice any MPG dent or other issues over time.

You can be the guinea pig.

Now I knew there was a reason I get Tony to carry out such jobs...