Curing Overheating? Viscous Fan Testing and Rebuild Part 2 

How have you overcome your 4WD overheating?

Thanks heaps for all your practical informative videos that you post.The way in which you explain things is very easy to follow.Many thanks.Cheers, Rob.

Glad you got it sorted out. Never knew how that stuff works.

Great vid mate, didn't know about the screw adjustments. Those screws stripped out on me too... so I replaced them all with M6 bolts, life long fix!

Great thanks for the update excellent knowledgeable videos

Make awsome explanation and just to mentioning if u don't like it thumbs dow it shows confidence in your work, a thumbs up from me mate

Goodness sake. What a fantastic video and explanation. Thank you. 👍

Great video. Just did this today.

One of the best things I've learnt on the interwebs this year is when you're dealing with a reluctant small soft screw or similar fixing, don't use any impact driver but instead, use a regular drill driver with it's clutch set to 'weak as p...' With the right size driver bit, I had a very difficult fan-clutch-hub-thingo screw out in mere seconds !! , with no great force or risk of damage.

Top video mate

Awesome video, thanks

This is excellent, explains what im dealing with and ive been racking my brain for months and heres the answer, thank you! months and heres the answer, thank you!

Great knowledge great video. 📡👽🇺🇸 RUN!!!

Butter screws and half a grunt lol we may be half a world apart but still have similar mechanic terminology... cheers from USA

Thx I learned a lot from this video

I replaced the screws on mine with Alan key bolts. i also put the tubes of silicon fluid in a container of very warm water to make it run easier.

Well done. 8 - 10 hp for the fan!! So when I bolted the failed viscous hub solid due to a silicon oil leak I reduced the power from the 2L petrol 21R in my commuter bus from claimed 105hp to 95hp! It was an old donk, with 300k on the clock, so it was possibly closer to 65hp at the flywheel before the fan mod and with the mod, getting down to 55hp...explains why it couldn't exceed 40km/h up steep hills in first! Ahh, those were the days - not.

I changed my fan clutch of my fj cruiser for a new one. I see that when cold the blades move not so freely and when hot it gets much harder. I have seen that the engine makes more effort and has lost acceleration. Could it be that the hardness of rotation of the blades influences the motor to slow down?

Where's your link for part 1 Please?

Cheers, thanks for the video mate, but I had the opposite problem to you. I bought a new Dayco clutch and it had too much viscous fluid in it & it wouldn't disengage, constant roaring/ howling so I sent it back & they sent me another one. Unfortunately the replacement did the same, so I opened it up and removed a couple of ounces of viscous fluid & that fixed it. Can only hear it now when stuck in traffic jam or going up long steep hill. Tip: if you want that thick viscous fluid to run out of the clutch like water heat it up with a heat gun and it just pours out ( don't worry, it goes thick again when it cools). Also, if the O-Ring seal is stretched & won't fit back in the clutch groove, heat it up also with your heat gun and U can actually see it shrink back to size. I used to boil them which is a lot slower.

Mate how comin donyou think this is in a 1kd?

The only trouble with that test is the factory gauge. Mine doesn't move until around 100°c. Would be good to see what real temp it's reaching.

Part 1 is this one: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YZ6pqwN1deU.html

if you don't have the adjustable type, you can add some more oil to make up the difference..

Can you over fill the cluth with fluid ? And how much did you know to put in?

what did you clean up the old fluid with?

Can you leave the old oil in there and just top it up

Can I use 1000 cst instead of a 10,000 cst recommended silicon oil?

Does the factor hubs take a full two tubes from empty?

What happens if I bore it and engage the fan permanently to the axe? Would this solution destroy the belt?

And no link

Is there a difference between a sahara hub and a non sahara ?

I never knew anyone actually fixed those things...I imagine if the bearing wears out it's probably Junk

Lol there is no part 1

If anyone ever sees this comment dont waste your money on genuine toyota viscous hub oil goto your local hobby shop pay $8 for 60ml 👍 instead of the $60 of bucks toyota charges you for 30ml

Awesome video. Thanks.