Tb42e viscous hub

[Parksy]

Hi all

As I understand, these fan hubs are not serviceable? Is this correct? But I have heard of people drilling holes into them to service them, then tapping the hole and putting a bolt in place. Does anyone have any pics of this? I'm just not entirely sure where to drill on these things. Does it need a 2nd air old to aid on fluid replacement?

Thanks for reading all


Andy

[Alitis007]

From what i found out when i was replacing the viscose hub on my fan was that there is 2 types, one is 95mm and the other is 110mm in diameter. From what i have seen only the td42's have a serviceable hub assembly and tbh i haven't heard of the method you just described to make an unserviceable hub serviceable so i can't help there. Why do you want to service the fan clutch ??

[Parksy]

It's been on its way out for awhile now. During summer in qld it would run warmer at idle, but if I put my foot on the accelerator to up the revs to about one thousand rpm, the temp would drop down again. Plus it's not as loud as it used to be.

[kevin07]

Hi all

As I understand, these fan hubs are not serviceable? Is this correct? But I have heard of people drilling holes into them to service them, then tapping the hole and putting a bolt in place. Does anyone have any pics of this? I'm just not entirely sure where to drill on these things. Does it need a 2nd air old to aid on fluid replacement?

Thanks for reading all


Andy

I was told to put 3 bolts in equally spaced to keep it balanced

[lhurley]

If you do end up putting a hole or 2 in it, be very very careful to not hit anything inside it. There isn't much room inside there.

[menace 2]

I have read here that some people have renewed the oil in them.......just get a new one mate...it isn't worth the hassles ...you already have to take it off anyway..

[Alitis007]

It's been on its way out for awhile now. During summer in qld it would run warmer at idle, but if I put my foot on the accelerator to up the revs to about one thousand rpm, the temp would drop down again. Plus it's not as loud as it used to be.

Do a quick test,
First thing in the morning listen to how loud the howls, it should stay on roughly 30seconds to a minute. When the car is at operating temperature if you idle up the motor and hold it at about 1500rpm and you should hear it cut in and out, when it engages the force from the air should be very strong. I changed my perfectly good fan clutch because it wasn't engaging when the car was hot but worked on first start up which ended up being a blocked radiator. But do what i said and let us know the results.

About it running hotter at idle is because the water pump relies on the the engine speed to circulate the water so at idle its generally flowing at a slower rate than it is at 1,000. Another thing to remember that qld is a tropical environment so the ambient air temp is warm so the water is harder to cool thru the heat sink of the radiator when the fan is drawing hot air.

[Parksy]

Thanks for your responses all. Wasn't convinced that the hub was 100% so decided to service it today. Turns out there are a couple of flat spots evenly spaced on the hub that make excellent drilling points. Drilled 2 holes into the unit and used an air compressor to drain the old fluid out. Didn't seem to be much fluid inside. But I had some 60k silicon fluid lying around from my rc car that I used and now the fan actually puts out a lot more air at idle. Temp on the ecu talk is also a lot more consistent.

Happy days!

[Bloodyaussie]

Did you take any pics Parksy... what size hole did you drill??

[Parksy]

Sorry BA didn't take any photos. Hole size was 3.5mm tapped to 4mm. Used some Hysol epoxy on the bolt heads to stop any possible leaks.

Found a pic online and circled where I drilled.
http://img.photobucket.com/albums/v92/Pakas/1F255D4A-6AAF-47CC-AB13-E9BF0BDF1032.jpg (http://s.photobucket.com/user/Pakas/media/1F255D4A-6AAF-47CC-AB13-E9BF0BDF1032.jpg.html)

[Bloodyaussie]

Thanks mate I appreciate your effort and will use this myself.... I have some of the oil from Toyota here to put in it.

I have 3 viscous hubs here so If I dont get it right I have a back up....

[Parksy]

Excellent. I used a syringe to get the fluid into the unit. It's quite thick and gooey and the syringe made it very easy. Highly recommended.

[lhurley]

The toymota viscus hub fluid comes in a little bottle, would be able to squeeze it through a little hole easy