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Clearance Issues Powder Coating Fan and Housing
Is there enough space available with the fan and fan shroud to powder coat both, or should I only powder coat one of them or perhaps remove powder coating from the fan edges?
They seem awfully close, and I really do not want to have any interference problems... has anyone had an issue with this? |
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07-27-2008, 06:05 PM
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Join Date: Jul 2001
Location: Suntree, Florida, USA
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I just went through this two days ago. Originally I had both powdercoated but scratched the hell out of them on the first go so I took them beack to be redone. First time around they fit perfectly... no rubbing at all. Second time I think he went a little thicker to save my bacon on scratches. Anyway, it rubbed. I spent about two hours sanding the edges of the blades back to bare metal. That made it better but not perfect. I have one spot in the housing where the fan "fixed" the housing.
My advice, ask him to wipe the tips of the blades before he bakes it. You will never see the tips since they are right up against the housing. I am not being ultra clear, but when I say tips, I mean the flat part of the outside of the fan. If that is not clear I will try to post a pic. Oh yeah, have the pulley coated too. I thought it woudl be fine if I did not do it, but it looked like crap so I took it in and had it done too. A little filing and sanding had to be done to get it to fit over fan mating point, but nothing hard. Here is a pic of the first try...  But this looks much better... (IMHO) 
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JB - BreitWerks www.breitwerks.com 321-806-8664 Engine Rebuild & Restorations |
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07-27-2008, 06:22 PM
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Try not, Do or Do not
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The fan tip should be stripped of all powder coating. You should also mask the area the holds the pulley assembly.
When powder coating the fan ring you should never coat the seating area for the alternator and the area where the fan ring mounts to the case must be stripped of all coating. If you leave the coating at the base of the ring you change the relationship between the crank pulley and the alternator pulley. This effects the way the fan belt fits. With a new belt it will generally be too tight even with all the proper shims (5) installed. Cleaning the contact area also aids in promoting good alternator grounding. It is generally a bad idea to powder coat the pulley. The plastic makes a poor surface for fan belt contact.      Here is the way we are prepping non concours, high performance fans. These are hard anodized, series 7000 aluminum.  
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net Last edited by Henry Schmidt; 07-27-2008 at 08:00 PM.. |
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07-27-2008, 07:37 PM
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Location: Centreville, MARYLAND
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Here are some.
  
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Old Tee all 911s sold |
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07-27-2008, 07:47 PM
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Wow, thanks for the advice--this pretty much plays into my concerns...Hopefully the powder coarter will be willing to mask the blade tips...or I will be spending quite a bit of time sandpapering them...
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07-27-2008, 09:02 PM
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Less brakes, more gas!
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Also, when you tighten the strap don't over do it. You make the fan housing go out of round... don't ask me how I know...
Henry: Nice fan mod! If I sent you the fan, what does a conversion to the aluminum cost me with no powder coating/paint/finishing on the fan? Old Tee: you should paint the pully mark on the bottom of the fan housing yellow to match  Best regards, Michael
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 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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07-28-2008, 10:05 AM
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Join Date: Mar 2006
Location: fair oaks, CA
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On another note-
What media is used to blast the fan and housing? I want to be sure the blaster does not use the wrong type. I have heard glass bead is a good choice??? thanks
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'82 911 previous: '86 951 '72 914 |
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07-28-2008, 01:10 PM
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I would think glass beads would be good--that is what I am planning to do if I ever managed to get the flippin' alternator out of the housing!
;-) |
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07-28-2008, 01:12 PM
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Location: fair oaks, CA
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I had to work the alternator out very slowly working my way around. They are tight for a reason.
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'82 911 previous: '86 951 '72 914 |
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07-28-2008, 03:04 PM
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This one is not budging...but I will of course keep working on it. ;-)
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07-28-2008, 04:46 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Don't force it... use a bigger hammer... :-D
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07-28-2008, 04:55 PM
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I had a sledge hammer around here somewhere! and a Chisel!
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07-28-2008, 07:33 PM
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I had a sledge hammer around here somewhere! and a Chisel!
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07-28-2008, 07:34 PM
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Join Date: Apr 2009
Location: georgia
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I know this is a year later and all but i decided to put new v belts on my 86 911 and i decided why the hell not go ahead and paint it............i pulled the fan, circular housing, and alternator out in one whole piece and i cant figure out how to get it apart.....i looked at the service manual but at this point it's about as helpful as a rock as a life vest........can anyone clue me in...
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07-03-2009, 05:46 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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I just went thru this today - WD40 is a good thing... Spray it down into the area where the alternator presses into the housing. Let sit for 10 minutes or so.
Put the whole assembly on a couple of 4x4s with the shaft facing down. Then get another piece of wood (like a 2x4) and place over the aluminum flange in the center of the alternator. Get a rubber mallet and pound away. The fan and alternator will separate from the housing, then you can separate the fan and alternator by pounding on the shaft (with the rubber mallet). JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) Last edited by jimbauman; 07-03-2009 at 08:40 PM.. |
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07-03-2009, 08:38 PM
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Quote:
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1968 911S "Leona" Air goes in and out, blood goes round and round, any variation on this is a bad thing. |
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07-04-2009, 03:28 AM
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Location: georgia
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does the alternator need to be out already? because i dont know how to get it out, and spraying a piece of electrical equipment with liquid never sounds good to me.....i dont know, then again if youve done it and it worked, i might as well
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07-04-2009, 08:47 AM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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This might help clarify things... this photo shows the fan, alternator, and housing like an exploded diagram. The surface of the alternator that's indicated by the arrow is the surface that squeezes into the housing. From this direction, you want to get a little WD40 into that area. If you use the long red straw that comes with the WD40 can, you can direct spray right where you need it and not worry about soaking your alternator in fluid.
 Once the alternator/fan assembly is separated from the housing, you can then separate the fan from the alternator. JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) Last edited by jimbauman; 07-04-2009 at 04:59 PM.. |
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07-04-2009, 04:57 PM
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Try not, Do or Do not
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Quote:
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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07-04-2009, 05:06 PM
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Porsche
Retor 911
Scarab
Riley
Ugly Betty
