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Fan and housing removal - Advice

Hey gang!

I've done a search on the threads, but there's a lot of unrelated stuff in there and I can't find my specific question, so here goes.

I want to detail my fan and the housing. Therefore, I need to remove them.

Can I simply take off the coil, undo the strap and any screws in the shroud and slide it out?

Do I need to take the pulley off, or can I slip the belt off once the strap is loose on the housing?

I've got the engine in, and want to do it this way. If there's a simple way, let me know.

Thanks
Jim
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1969 911T "Blood Orange" Euro (Brought over from Germany in 86)
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"Oversteer scares passengers, understeer scares drivers."
Old 03-20-2005, 12:51 AM
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It is simple, but i would remove belt before ( i did anyway). Its not a big thing. Undo belt, strap, 3 bolts, at back undo alt wiring take off housing, remove fan blade, take alt out of housing and paint.
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Old 03-20-2005, 01:03 AM
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I don't think you'd be able to get the thing off without removing the pulley and belt.

It's pretty easy. If your shroud is developing corrosion (Mg does that from the inside out) then it could be a pain to get the alt out of the housing, but it can still be done. And it might be good info to have.
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Old 03-20-2005, 06:54 AM
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It should be possible to remove the fan housing and alternator without dropping the engine. You must remove the pulley first, remove the screws on the fan shroud, Loosen fan strap and pull away.

One thing to remember is to make a picture of the wires on the alternator or mark them. You don't want to forget where they go. Picture works best.

Good luck!
Old 03-20-2005, 07:13 AM
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Jim, unless you have a photographic memory, you'll want to draw a little diagram of the way the wires hook up. When I had mine all apart, I had both the fan and housing powdercoated. My powdercoater wished that I told him it was MAG before though. Magnesium doesn't usually withstand the heat involved in powdercoating. I lucked out.
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Old 03-20-2005, 07:18 AM
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I pulled mine yesterday (first time) for some general cleaning and it was really a lot easier than anticipated.
1. Fan belt off (removed pulley)
2. Coil off
3. Strap loose
4. Other housing to shroud fasteners removed
5. Slide the whole thing back to get at the 6 nuts on 'glass diverter cone
6. Label and disconnect wires (and pictures)
7. 45 minutes of hand and arm scrubbing to regain original skin color

Removing the six nuts on the cone was the biggest pain particularly the bottom driver's side with the ground strap, due to hand clearance.

I didn't even try tapping the studs with a hammer to separate fan/alt from the housing and went straight to the "bang it on a piece of plywood padded with shop rags" technique (thanks to Grady, I think?) A couple of whacks, turn 180 degrees, repeat. It just slipped apart.
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Old 03-20-2005, 07:27 AM
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One question about it... If you took the fan out and cleaned it up, but couldn't afford powdercoat, could you use a hi temperature paint, like brake caliper paint? Or would it just end up looking like ass?
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Old 03-20-2005, 07:31 AM
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I had mine just glass beat blasted to avoid heat issues with powder coating. It restored the Alu color nicely and still looks good after 3 years.
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Old 03-20-2005, 07:52 AM
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Old 03-20-2005, 07:53 AM
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FrayAdjacent, here's a good article provided by our host on engine detailing.

http://www.pelicanparts.com/techarticles/tom_sharpes/911_engine_comp1.htm
Old 03-20-2005, 07:57 AM
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Quote:
Originally posted by PatrickM
FrayAdjacent, here's a good article provided by our host on engine detailing.

http://www.pelicanparts.com/techarticles/tom_sharpes/911_engine_comp1.htm
Nice. See, it doesn't have to be expensive to have a nice looking engine bay!
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Old 03-20-2005, 08:33 AM
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Thanks for the input guys.

Okay, here's how it went.

Removed coil
Undid strap
Took the two closest screws out of the shroud/air outlets
Leaned the fan housing forward to slack the belt and slipped it off
Fan and housing is now free, along with the pulley
Have access to the wires. Just need to diagram and disconnect.

I trial sanded some of the fan already while it was in to see how it would look. Similar process to what I did with my wheels. I tell you, it comes up to a mirror shine once polished. Looks beautiful. Should be a nice contrast to the fresh paint the air cover will be getting.

There is no need to take the pulley off. I was concerned about this due to the setup with the spacers, and the extra hassle.

Thanks again

Jim
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1969 911T "Blood Orange" Euro (Brought over from Germany in 86)
Engine and brake system rebuilds 2006 & 2007
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Old 03-20-2005, 09:04 AM
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That's cool that you were able to get the thing out without removing the pulley.

I'm not sure I really see where the problem or hassle comes in by taking the pulley and spacer off as long as you put them back on, but as long as your are happy.
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Old 03-20-2005, 09:10 AM
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But you wont be able to put it back this way. At least i think so. So it will be harder to remove pulley now then when it was on.
I really dont see why you wouldnt want to undo pulley.
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Old 03-20-2005, 10:22 AM
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you could use paint - it isn't the high temperature but the high speed debris particles that is the problem. they will eventually remove the paint - you might polish it and spray clear over that - it will prevent the Mg corrosion and you won't see such a big change as the dirt chips it away
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Old 03-20-2005, 10:35 AM
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lets see a pic of that polished fan! i want to clear my housing too. You guys are saying that clear powder coating is a no no?
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Old 03-20-2005, 10:43 AM
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Recommended reading.

I investigated the options a couple years ago and went so far as to contact a couple magnesium manufacturers. One was kind enough to send me a detailed response which I found interesting. I've attached the post that contains his email. One thing to note from his reply is to be careful what you use to polish magnesium. Do not use anything containg steel. I ended up just going the polishing route using alumina oxide, but it needs repolishing annually and loses its just polished gleam in about 6 months.


Input from magnesium mfgr on fan polishing.
Old 03-20-2005, 11:15 AM
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Thx for reposting that! -- did you pursue that further with the manf.?

And what plating process was he talking about?
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Old 03-20-2005, 12:01 PM
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i used ultra high temp paint,its a bit of a pain as it does not fully dry until it gets quite warm,so i ended up with some finger marks on the fan housing when refitting it-oh well you live and learn.
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Old 03-20-2005, 12:42 PM
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Quote:
Originally posted by randywebb
Thx for reposting that! -- did you pursue that further with the manf.?

And what plating process was he talking about?
I did follow up and received a procedure from him. I can't recall where I put it but I do recall that the chemicals were bad stuff. Evidently chromium used in the plating is not something you want around the house. Carcinogen maybe? There were a few places that would do it for me but I decided to just polish annually and not go through the exercise. If I find the information, I'll post but it's been about 2 years so ....

I seem to recall there may have been a requirement to remove the steel pulley section from the fan as well. It got too complicated for my energy level at the time.
Old 03-20-2005, 01:51 PM
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