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-   -   Removing fan from alternator shaft? (http://forums.pelicanparts.com/porsche-911-technical-forum/287916-removing-fan-alternator-shaft.html)

slotcar 06-12-2006 09:38 AM

Removing fan from alternator shaft?
 
How do you remove the fan from the alternator shaft. I'd like to have the fan bead blasted. Do you have to counter hold the fan/alternator shaft while removing the nut in the front?

Wil Ferch 06-12-2006 10:18 AM

see here, action #12 --> http://www.pelicanparts.com/techarticles/911_volt_reg_replace/911_volt_reg_replace.htm

Or.....some people use a gear puller, and use the threaded holes ( if available) on the front face of the fan to screw in some bolts for the puller to grab on to. The counter-force of the puller is then against the fan shaft. Never pull by the blades.

- Wil

vash 06-12-2006 10:39 AM

friend of mine presses mine off. but i take everything off - out first.

Miguel Antonett 06-12-2006 10:45 AM

If lucky you can pressed it out by hand; there is nothing holding it in place after removing the nut/shims/pulley. Don't pull on the tips of the blades, hold it from the middle/solid and pull it straight out. If not go wilferch route.

slotcar 06-12-2006 11:33 AM

Here's the irony....I put two drops of PB blaster on the threaded section of the alternator shaft...left to grab a bite to eat. When I came back, I set up a couple of 2X4's...when I turned the fan shround/alt/fan assembly on to the wood blocks...the fan, spacer and "key" fell off :) Much ado about nothing....the threaded section is what throws people off..... The alternator popped out of the fan shround with a couple of gravity drops onto the wood blocks. Lesson of the day...PB blaster/penetrating oil is your friend.

LakeCleElum 06-12-2006 12:07 PM

Take nut off with an air wrench.....PB blaster, sit overnight and lightly slam the threaded end of the shaft onto a piece of light wood like a 2 X 4 laying on the floor.....Fan should come off....

Kirk Lundmark 06-12-2006 12:26 PM

Mine came off after a sharp rap to the shaft with the hard plastic end of my small mallet. I also thought I had lost my key while putting on the new fan. The key popped out and landed inside the alternator and not in the bottom of the bracket that covers the pulleys. That could have been quite a mess.

ADDvanced 05-11-2020 02:05 PM

Anyone have any secret tips on this? I've been soaking the interference fit w Kroil for 3 days. I've tried tappin on the back of the hub w a small hammer. I've tried setting up blocks of wood and suspending the alternator so everything is resting on the rear edge of the hub, and rapping the shaft to drive the alternator downwards.

Seriously thinking about busting out the torch soon, and focusing the heat on the hub of the fan. I don't have threaded holes on the fan so I can't use a puller.

Fever 05-11-2020 03:49 PM

With the alternator still on the fan hsng lay a piece of wood on the floor/bench hold the hsng and slam one edge of it against the wood block, it might need a few tries but it should dislodge the fan out of the alt., works for me everytime, Jay.

Walt Fricke 05-11-2020 05:07 PM

I find a chatter gun is the tool for this. An air chisel, but you find or fabricate a workpiece with a blunt end, as by welding a thick washer on the end. While pulling on the fan with one hand, hold the end of the work piece on the shaft of the alternator, axially, and chatter away. Doesn't seem to take long to vibrate the fan loose.

An alternative is a pointed end work piece, like a punch. A small dimple in the end of the shaft won't hurt anything, but a blunt end seems a better practice.

Oneredspyder 05-11-2020 06:17 PM

Careful with the torch idea, it is magnesium and it will self ignite your entire garage.
For real

ADDvanced 05-11-2020 09:16 PM

Well. I got it off. Iíll post a video later but I am amazed at how much force it required to remove. I was using a small sledge hammer on the shaft, and supported the back of the fan on some steel blocks on my driveway.

I tried the torch as well, just local heat on the center of the fan; assumed the center was not magnesium and it didnít light on fire so idk.

I was into ally using blocks of wood but was getting nowhere. I also tried using a small piece of wood in between the shaft and the sledge, but I eventually eliminated that too.

100% of the force was going to breaking the bond. No loss in any type of wood, even still, I had to WAIL on this thing a couple times to get it free. Kind of amazed.




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