Front fan coming on a lot - normal?

[JimL]

Jim
Got part no off the bottle. I was surprised it is the same as in that article too!
Pete

Ordered the silicon fluid on Wednesday, not in stock but was expected in next day. Went to collect today Saturday and its still not in and the different parts guy hadnt a clue about fluid in fans and was looking at me as if somebody was winding me up. It shows that whenever they have a fan which aint working right they just order a complete new viscous fan and dont bother themselves with fluid and such.
The thing I'm wondering is though, maybe the part number isnt the normal one which would be used here in these markets. Anyone know how you could find out the local part number for use in Hilux's and Cruisers, it would have to be the right stuff to use in the surf.

[gemini]

Ordered the silicon fluid on Wednesday, not in stock but was expected in next day. Went to collect today Saturday and its still not in and the different parts guy hadnt a clue about fluid in fans and was looking at me as if somebody was winding me up. It shows that whenever they have a fan which aint working right they just order a complete new viscous fan and dont bother themselves with fluid and such.
The thing I'm wondering is though, maybe the part number isnt the normal one which would be used here in these markets. Anyone know how you could find out the local part number for use in Hilux's and Cruisers, it would have to be the right stuff to use in the surf.

silicon oil can be bought in model shops, it is used in the ls diffs in 1/8th scale off road model cars and comes in different weights according to thickness, it basically does in the diff the same as it does in the fan, just been back to the link and it is 3000wt in the fan,

http://www.gmmodels.co.uk/acatalog/Shock_Oils.html
scroll down the page to 3000wt

[JimL]

Ian, thanks its a pity though I cant locate something like that over here, found one model car place on the net and rang them but he only has 2000 and 10000. It seems Toy in Oz recommend 10000 while up in the damp northern hem 3000 is coshir. With that in mind I'd think of going for 4 or maybe 5000 seen as there is an 'issue'. Maybe peeps towing caravans in tailbacks should be sticking in the 10000 or glueing the visc clutch together permanently.



Never happy

[Guest]

Ian, thanks its a pity though I cant locate something like that over here, found one model car place on the net and rang them but he only has 2000 and 10000. It seems Toy in Oz recommend 10000 while up in the damp northern hem 3000 is coshir. With that in mind I'd think of going for 4 or maybe 5000 seen as there is an 'issue'. Maybe peeps towing caravans in tailbacks should be sticking in the 10000 or glueing the visc clutch together permanently.



Never happy

Fill it full of PVA glue, you'll never have a problem again except with your eardrums bursting with the noise.

Cheers

[JimL]

I'm one of the many who have never heard the fan kicking in. I wonder if I hooked a caravan up and took off over the mountains I'd be up $hit creek without a head.

[Woodie]

Ian, thanks its a pity though I cant locate something like that over here, found one model car place on the net and rang them but he only has 2000 and 10000. It seems Toy in Oz recommend 10000 while up in the damp northern hem 3000 is coshir. With that in mind I'd think of going for 4 or maybe 5000 seen as there is an 'issue'. Maybe peeps towing caravans in tailbacks should be sticking in the 10000 or glueing the visc clutch together permanently.



Never happy

Just resurrecting this thread as I tested my fan today and the resistance was little when cold or at running temperature, I gather I need to refill it then, what was the verdict on the oil weight from the earlier posts please anyone? 3000, 5000 or 10,k ???

[JimL]

The verdict is:

US & Europe use 3000cst

Australians use 10,000

No-one seems to have gone for anything else, theres no discussion at all about it. I could only get my hands on 1,000 and 10,000 so I mixed the two into 5,500 and threw 30ml into the clutch. Dont know the result yet.

[Woodie]

The verdict is:

US & Europe use 3000cst

Australians use 10,000

No-one seems to have gone for anything else, theres no discussion at all about it. I could only get my hands on 1,000 and 10,000 so I mixed the two into 5,500 and threw 30ml into the clutch. Dont know the result yet.

Cheers Jim, does your fan clutch stiffen up now at normal running temp, or, something I just thought of, does it only kick in when the temperature goes above normal??? paranoia?

[JimL]

The theory is the heavier the weight of the silicon fluid the denser and more viscous it is, so heavier means more adhesion between the two sides of the clutch when the magic fluid is sent in to do its job



viscous

adj 1: having a relatively high resistance to flow [syn: syrupy] 2: having the properties of glue [syn: gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid]


Source: WordNet ® 1.6, © 1997 Princeton University

(you'd swear I knew what I was talkin about, oops heres the ward sister better put the straight jacket back on)

[Woodie]

The theory is the heavier the weight of the silicon fluid the denser and more viscous it is, so heavier means more adhesion between the two sides of the clutch when the magic fluid is sent in to do its job



viscous

adj 1: having a relatively high resistance to flow [syn: syrupy] 2: having the properties of glue [syn: gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid]


Source: WordNet ® 1.6, © 1997 Princeton University

(you'd swear I knew what I was talkin about, oops heres the ward sister better put the straight jacket back on)

Erm, right, I see, so does it make it really hard to turn when the engine is hot and its easy to turn when its cold? The way I see it is that is what its sposed to do to save power, the fan only works hard when its needed, ie hot, but the question is how hot?

[bai1911]

front fan(aux fan)coming on a lot

[AndyLala]

viscous fan and RC Diff oil

Ok.

As has been mentioned, RC Diff oil is the same weight as the Toyota Part. Bearing in mind that your local Toyota Parts Oik will think you are speaking dutch...

3000 wt Silicone Diff Oil can be obtained from the following people. (GS Racing distributors)
They should be able to post it out.

Helger Racing
Units 2 & 3, Ployters Road
Staple Tye, Southern Way
Zip Code: CM187NS
City: HARLOW (ESSEX)
Tel:0044.1279.641097
Fax: 0044.1279.428863

I have just picked up some 3000wt from the following people. It is a normally stocked item for them, although I got their last bottle. They are expecting some in. (2 Oz [US] = approx 58ml - £3.99]

The Harrow Model Shop
190-194, Station Rd
Harrow Middlesex
HA1 2RH

Tel: 020 8863 9788

Product Description.

http://www.gsracing.com/gsracing/pag...ootid=0&id=949



Pure Silicone Diff. Oil 3000 cps
DETAILSSuggested Sale Price:$6.49

Part Number:GS-70021

Product Description:Two ounces of the highest quality silicone oil in a color coded, leak-proof bottle, with a cone shaped tip for clean and easy use. Available in 1000, 3000, 5000, 7000, 10,000, 20,000, 30,000 and 50,000 weights (CPS). This oil is highly accurate and consistent and will provide the best dampening and lubrication for your r/c model.Related Products:Also available are GS silicone shock oils.

[Smeg]

check yer units!

Well, sitting here at work (on a Saturday, yippee) this makes interesting reading since I'm currently measuring ....... viscosity!! (Of resins, not oils though).

OK, just to confuse the issue more - you need to check your units!

The bottles pictured look like they're in centipoise (100th of a Poise) although that should really be quoted as just "cP" but some quote it as "cps". Poise are pretty standard units of viscosity, but meaningless without temperature.

Woodie quoted centistokes (cSt), which is the kinematic viscosity as opposed to poise which is the dynamic viscosity. From a couple of bottles of certified viscosity standards we have in the lab which are silicone based, the numbers are pretty close (2841cP vs. 3344cSt).

As to "weight" I haven't a clue! This is more commonly used for engine oils and doesn't seem to have a direct relationship to either of the above. The numbers you see quoted on engine oil (i.e. SAE10W-40) refer to particular limits that the oil conforms to (the 10W being the winter measurement, 40 being the summer, erm, I think).

And, you're all quite correct - viscosity is linked to temperature. What confuses me about the viscous clutch is that from everything I can find it appears to work the wrong way - i.e. as it gets hotter the silicone fluid "stiffens". Fluids usually become less viscous with heat. That's gonna take more thought power than I use on a Saturday....

Anyway, what I really posted for (apart from occupying myself between samples) is to say:

check your units! Can anyone find what Toyota actually quote? Also, if they are quoting a value in cSt or cP, it needs a temperature - for instance one of my standards is 3344cP @ 20°C, but only 80cP @ 100°C - quite a difference.

If anyone wants to get some original Toyota oil to me and the stuff that has been used to replace it, I'll happily test them to see if I can work out what's what...

Geoff.

PS Will you all remember to bring your homework to next weeks random science lesson....