Curing Overheating? Viscous Fan Testing and Rebuild Part 2

[@LockyourHubs4WDing]

How have you overcome your 4WD overheating?

[@highcountryrob5534]

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.

[@LockyourHubs4WDing]

Glad you enjoyed it mate!

[@rantyrobski9555]

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.

[@LockyourHubs4WDing]

Thanks, must to try it!

[@teapartyassassintjm6247]

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

[@LockyourHubs4WDing]

Thanks mate!

[@coltmcginnis6059]

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

[@LockyourHubs4WDing]

Definitely! Don't forget the ugga dugga torque spec!

[@MiniLuv-1984]

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.

[@MiniLuv-1984]

Incidentally, and if memory serves me well, the viscous coupling in my HiAce looked exactly like the one you were working on from the outside.

[@LockyourHubs4WDing]

Probably the same part! The drag from fan is one of the reasons most manufacturers have moved onto electric thermo fans. Cuts fuel consumption and emissions.

[@MiniLuv-1984]

​@@LockyourHubs4WDing Two bottles of silicon oil is best value, but if the unit was completely rooted and you needed to replace it, would you instead fit the thermatic fans? It seems, under those circumstances, one would put the extra friggin around factor to do the conversion.

[@LockyourHubs4WDing]

@@MiniLuv-1984 one reason I like electric fans is the ease with which you could install a switch to cut the fans for water crossing, or even hard wire an on switch if the temp circuit fails.

[@MiniLuv-1984]

@@LockyourHubs4WDing effen excellent point! Hadn't thought of that.

[@DavidSmith-vs2zp]

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!

[@LockyourHubs4WDing]

I probably should have as well.

[@kadiocalc]

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

[@LockyourHubs4WDing]

You and I both! I only had a couple of more tricks up my sleeve left....

[@roberthiggins1142]

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.

[@LockyourHubs4WDing]

Great idea about replacing the screws, they're made of butter!

[@roberthiggins1142]

@@LockyourHubs4WDing that they are from memory I stripped Three of them & had to get the old screw extractor too get them out.

[@chippywarren9706]

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

[@LockyourHubs4WDing]

Thanks mate, glad you liked it!

[@chippywarren9706]

@@LockyourHubs4WDing Deserved mate.

[@dirtyoff-roadaustralian5525]

Great thanks for the update excellent knowledgeable videos

[@LockyourHubs4WDing]

I just glad it's sorted, Kayla knows my phone number if the car is playing up and doesn't hesitate to use it! Kids..... :)

[@robdog4684]

My 80 series overheats whilst beach driving. I’ve replaced the fan clutch with a genuine Toyota one and it still overheats. Should I be adding or removing oil from the fan clutch?

[@LockyourHubs4WDing]

Adding oil will make the clutch engage sooner, another thing to check will be the sealing around the radiator. If the foam strip sealant is missing between the radiator and body, the air will take the path of least resistance around the radiator at speed. So seal it up and force the air through the radiator.

[@matthewstewart555]

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!

[@LockyourHubs4WDing]

Glad to help!

[@robertboyd321]

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.

[@LockyourHubs4WDing]

I never thought of heating up the gasket, thanks!

[@jamessouth4776]

I also bought an aftermarket Dayco fan clutch and found it to be rubbish, never cuts in at all so rebuilt the aisin unit instead. The Dayco units are very hit and miss.

[@leighpember7630]

Great video. Just did this today.

[@LockyourHubs4WDing]

Glad it helped!

[@ThePepperford]

Awesome video. Thanks.

[@LockyourHubs4WDing]

You're welcome!

[@charlesincharge.5161]

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

[@LockyourHubs4WDing]

Thanks!

[@josezambrana5773]

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?

[@lukep5130]

Top video mate

[@LockyourHubs4WDing]

Cheers!

[@jezzamorri7816]

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

[@LockyourHubs4WDing]

I guess you could! Though the 2 bottles of silicon fluid we filled it with wasn't full.

[@tsdd.1567]

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

[@LockyourHubs4WDing]

No, but it would sound like a jet engine and waste power.

[@tsdd.1567]

@@LockyourHubs4WDing Thanks for the reply. Indeed it sounds like a jet :)

[@heftymerv]

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

[@LockyourHubs4WDing]

They have more capacity?

[@michaelavdalis4382]

How much can you add

[@heftymerv]

@@michaelavdalis4382 Toyota says 2 bottles, get three.

[@michaelavdalis4382]

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

[@LockyourHubs4WDing]

While you've got it apart, I would just clean it out and replace the lot.

[@kotasonamtenzin]

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

[@LockyourHubs4WDing]

Unfortunately not, you'll need to use the correct silicon oil.

[@MrTD42T]

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.

[@LockyourHubs4WDing]

Agreed, in my 80 I've got an engine watchdog bolted to the coolant outlet pipe, the temp gauge stays in the middle over a very big range!

[@deongouws8801]

Thx I learned a lot from this video

[@LockyourHubs4WDing]

Cheers, glad you liked it!

[@CraigBlackhall]

Where's your link for part 1 Please?

[@cvAero]

Thanks

[@LockyourHubs4WDing]

No problem

[@rubiconned]

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

[@LockyourHubs4WDing]

Yep, two tubes from empty.

[@anaccount3244]

@@LockyourHubs4WDing how many ml (or oz.) in that tube?

[@beejoutbush3322]

what did you clean up the old fluid with?

[@LockyourHubs4WDing]

Just washed it out with Kero.

[@trollzilla4533]

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

[@LockyourHubs4WDing]

Both are the same for the diesels

[@trollzilla4533]

@@LockyourHubs4WDing cheers mate pulled mine apart re oiled put her back together in about an hour

[@andrewarthur4657]

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

[@timothyhall861]

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

[@LockyourHubs4WDing]

With the prices that Mr Toyota charge for a new one, it makes sence to rebuild them.

[@trollzilla4533]

And no link

[@usefulinfo5005]

Part 1 is this one: kzbin.info/www/bejne/j4uZoaStg5aXm7c

[@trollzilla4533]

Lol there is no part 1

[@trollzilla4533]

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

[@LockyourHubs4WDing]

Thanks for the tip!

[@mrhb2u]

Awesome video, thanks

[@LockyourHubs4WDing]

You're welcome!