Fan Nut Threading

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Tomaboyd
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Fan Nut Threading

Post by Tomaboyd » Sat Mar 21, 2020 9:06 am

Is the fan nut normal or reverse threaded?

Mine won’t budge either way and I would like to know before I start applying max pressure.

Thanks.

newtopinz
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Re: Fan Nut Threading

Post by newtopinz » Sat Mar 21, 2020 9:32 am

Should be normal threaded. If you look at the fan blades and how it should rotate, it is clockwise rotation when viewed from the front.

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rmel
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Re: Fan Nut Threading

Post by rmel » Sat Mar 21, 2020 9:43 am

Standard right hand thread -- clockwise.

A common issue that some have done is over-tighten, MAX torque is 67 Nm (49.4 ft-lbs).
Some has thought it was a left-hand thread and thus over-tightened.

It is also somewhat awkward to remove this nut without the fan locking tool. If
you don't have that get one or make one. It makes a big different it being able
to get leverage on the fan without putting stess on the fiberglass blades.
Puller: 71' 710K 2.7L EFI aka Mozo
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712M

Driver: Ron // KO0Q

Tomaboyd
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Re: Fan Nut Threading

Post by Tomaboyd » Sat Mar 21, 2020 9:48 am

Thank you. I do have the tool. I even enlisted the help of a friend and we could not get it to budge. Today we will try an impact gun and/or cheater bar. Just wanted to make sure I was pulling the right direction.

Thanks again.

ChickenPinz
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Re: Fan Nut Threading

Post by ChickenPinz » Sat Mar 21, 2020 2:04 pm

I just loosened mine for the first time, and like yours, it was crazy tight. But using a pneumatic impact wrench with a tight fitting six-point socket I was able to get it loose. Will definitely use a torque wrench for reinstallation.
710K

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djw
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Re: Fan Nut Threading

Post by djw » Sat Mar 21, 2020 4:03 pm

The first time I removed mine I had to use a little butterfly air wrench as it fit nicely in the space. The nut was a bit rounded when I got the truck. A couple of short blips and it was free and correct since.

I figure the Austrian military kid that last tightened it had a lot more muscle than me.
'74 710K (ÖBH Austrian Rehab) mostly unmolested original - the unicorn (everything works!)
collecting pinz docs since 2012 - pm me if I can help

lifefloat
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Re: Fan Nut Threading

Post by lifefloat » Sun Mar 22, 2020 9:06 am

I think the same Austrian military guy overtightened my fan nut too!!!!.

Finally got it to break free using a cheater.

I put a dab of never-seize on it since then and it isn't and issue now.

Recently I had to take my fan off to get a rat nest out of the air space on top of the cylinders. Fn rats.


The rat chewed up a spot or two on the fan also. Due to the fact this is a balanced piece, I have since replaced my fan. I now have a slightly chewed spare. Not sure if this was an over reaction on my part to replace the fan but I do not ever want a fan to grenade on me. I've read some horror stories about that happening.

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