I got to trying to take off my clutch fan yesterday and I was having a hard time getting it off. There is a [brass?] nut behind that seems like maybe it is threaded on to the pulley wheel that is behind it. When I try to spin this it just moves the pulley wheel on the belt. There must be a way to do this easily, but both the clutch fan and pulley wheel will spin with the nut. What am I missing? Was it just too much holiday cheer...
Thanks

 

That big nut is reverse thread.

Try a big strap wrench or a big pair of channellocks over a fan belt to hold the pulley. A lot of guys use a punch and a hammer to knock 'er loose. Impact is a lot more effective than brute force.

 

Thanks wannadiesel - you are fast.

 

BFH straight down and a little LH pressure on the fan clutch wrench......

 

I put the fan puller in a vice, put a 3ft pipe on the end of the wrench and applied a little pressure. This was after 3hrs of using a 1lb rubber mallet, 1lb framing hammer, and a 3lb mini sledge.

 

First squirt a little penetrating oil on it. Use an air chisel and make a little divot in the nut, then angle the air chisel in the direction you want to turn it and position the tip in the divot you just made and show it who is boss. You can use a ratchet strap to hold the pulley, or I just hold some extra tension on it by pulling on the belt. I broke a ratchet strap and fought with it for hours using the big wrench, and had a hard time using a hammer because my punch was way to short and had no room to hit it hard enough. Neighbor came over with his air chisel and had it off in 30 seconds. I do it his way now...

Aaron

 

I put some anti-seize compound on the threads of the big nut before reassembly. It's most helpful.

 

Or just remove belt, take the (4) 10mm bolts out that hold the perch to the block and slide the whole thing out. Take it to a nice warm place with plenty of light to operate.

 

So far I've always been able to get them by putting my 1 5/16" (or whatever size it is) wrench on and whacking the wrench with a hammer. Took quite a few whacks last week but it eventually came loose.

I like to slide a couple layers of cardboard down in there to protect the rad a little just in case I slip.

JP.

 

I took an old 1 1/4 wrench and ground the jaws oversize a bit,
worked perfect

 

This method also works the best for me!

 

Ok guys here is how I got my fan clutch off.

This a reprint of an older post that I had made.

https://www.dieseltruckresource.com/...t=removing+fan

First I could not find a wrench that would fit the big nut on the hub.

So I took an old 1¼” wrench I had and then using my 4” Angle Grinder I ground out the opening parallel to 1 7/16 that now fits the nut on the clutch.

The handle extension is 24” of ¾” Black gas pipe.



Then using my Blue Point Chain Wrench I wrapped the chain around the pulley and secured the end of the chain into the jaw.

This chain held the pulley securely and kept it from turning.



Holding the chain wrench with my Left hand I then engaged the fan clutch nut with my modified wrench I pulled the handle clockwise and the nut loosened with almost no effort.

Then all it took was to turn the fan about a dozen more turns to remove the fan being careful not to drop the fan into the radiator.

It was amazingly easy to remove.



Harbor Freight had a cheap copy of my Blue Point but this one should also work.

http://www.harborfreight.com/cpi/cta...emnumber=97073

Vice-Grip also makes a pair of grips with a chain in place of the jaws; I have several pair of these.

http://irwin.com/irwin/consumer/jhtm...rwinProd100322

No beating, cursing or loss of knuckles or blood.

Jim

 

You guy are the best!
Thanks