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Pics of old fan and housing
I swapped out my fan and housing today that I bought from our host due to corrosion, cracking and rubbing which is visible in the pics, during the swap I cleaned some corrosion off the big red lead to the Alt, if anybody ever needs to change out the alt or to power coat there fan it is a fun easy job, I spent about 2.5 hrs on it.
Take care, Jack 87 Carrera       
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11-09-2004, 04:12 PM
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Double Trouble
Join Date: Nov 2002
Location: North of Pittsburgh
Posts: 11,705
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looking good Jack.
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I used to be addicted to the hokey pokey..........but I turned myself around.. 75 914 1.8 2010 Cayenne base |
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11-09-2004, 05:05 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,132
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The tip of the blade in the bottom picture is similar to one of the things that I had on about 6 blades of my fan. I also had the same sort of thing with long cracks at 4 of the 5 struts that hold the alternator centered in the housing at the alternator end. It's ugly. I still have my old parts. The way Mg corrodes is pretty bizarre to someone who is used to corrosion going from the outside in instead of the other way around.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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11-09-2004, 05:10 PM
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Ya, its called intergranular corrosion (sp) I learned about it hanging around airplanes, it looks weard, inside the blisters is a black pastey substance. The corrosion in the housing caused the alt to twist out of position. Each support in the housing was cracked. I wonder how much strength was left ? I guess its the O2 in the mag that causes it to act like that.
Jack Last edited by Jack Gresham; 11-09-2004 at 05:25 PM.. |
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11-09-2004, 05:21 PM
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Double Trouble
Join Date: Nov 2002
Location: North of Pittsburgh
Posts: 11,705
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a mechanic AND a chemist! jack you amaze me.
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I used to be addicted to the hokey pokey..........but I turned myself around.. 75 914 1.8 2010 Cayenne base |
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11-09-2004, 06:45 PM
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Wow Jack, looks like a good move changing out those parts!! Could you hear the fan rubbing on the housing? The new fan looks so shiny...is it clear-coated or something? Did the new housing have that same shiny finish before you had it powdercoated?
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Bob V 1974 911 Carrera coupe Grand-Prix-weiß 1977 930 turbo Carrera coupe Hellgelb 2018 Cayenne turbo Schwarz 2019 911 GT3 RS Schwarz |
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11-09-2004, 07:35 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
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The original parts were not coated. When you buy new parts they do come coated. My fan, a genuine Porsche part from Pelican, came with a clear coat over the otherwise lackluster finish of the raw Mg, and the housing came with a matte black coating like you see in the pic above.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa SOLD 2004 - gone but not forgotten
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11-09-2004, 07:43 PM
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Registered
Join Date: Nov 2002
Location: Planet Eugene
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If we cold find out what PAG is using to coat the new Mg wheels on the C-GT, we'd be home free on this stuff.
The properties of MG never cease to amaze me..... |
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11-09-2004, 08:09 PM
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So extactly how does the antifreeze run thru the fan....
 Jason |
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11-10-2004, 12:11 PM
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MBruns for President
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Quote:
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 Last edited by JeremyD; 11-11-2004 at 03:47 AM.. |
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11-10-2004, 02:57 PM
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And a fishing boat Captain, war hero and a football star.
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11-11-2004, 01:54 AM
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Double Trouble
Join Date: Nov 2002
Location: North of Pittsburgh
Posts: 11,705
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Jack stop being so humble.
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I used to be addicted to the hokey pokey..........but I turned myself around.. 75 914 1.8 2010 Cayenne base |
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11-11-2004, 04:55 AM
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MBruns for President
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And your brother John is an accomplished author too!
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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11-11-2004, 05:08 AM
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
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Quote:
so does this mean that a protectorant isn't any help ?
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-11-2004, 05:52 AM
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Join Date: Jun 2004
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Hi Jack,
I have the same problem and plan on changing the fan housing soon. Even though the new housing is coated black, is it thick and strong enough or would you recommend power coating it. BTW, the new fan and housing looks really great! Cheers |
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11-11-2004, 07:45 AM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
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The coating on the fan and housing both seem pretty thick. I think they should do the trick.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa SOLD 2004 - gone but not forgotten
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11-11-2004, 08:14 AM
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My gut feeling is that no coating would protect magnesium from internal corrosion, I was told that magnesium does that due to its high oxygen content, I left the new parts as they came for 2 reasons, they should last at least 17 years and the clear coat on the fan protects its looks and I liked the contrast against the black housing.
Jack |
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11-13-2004, 06:41 AM
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1987 Porsche 911 3.2
1974 911 Carrera
1977 Porsche 930
2019 GT3 RS Weissach
2018 Cayenne turbo
Gone to California
Turbo
