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Would you use this fan?
Note the chipped blade. I took the fan off to clean it and found this chunk missing. I have no idea how long it's been that way. My concern is the imbalance leading to vibration. Considering that a replacement is around $300, can this thing safely be used, and what is the risk?
Thanks  
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Jason '73 911 Carrera RS clone w/3.0 |
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03-11-2012, 09:55 AM
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Rough up the spot and fill and shape the divot with some JB weld. You've been using it this long...
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Kurt |
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03-11-2012, 10:26 AM
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Looks like it might have been stress relieved already.
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03-11-2012, 12:57 PM
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76 911S Targa
Join Date: Oct 2010
Location: Idaho
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I used Alumiweld stick with a propane torch to fill my divots. Then sanded flat.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods. |
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03-11-2012, 12:57 PM
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Taking it apart is easy
Join Date: Nov 2009
Location: rural Quebec, Canada
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Quote:
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Jerome PLEASE CHECK MY QUIZZICAL BLOG: www.ponderingporsches.blogspot.com |
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03-11-2012, 01:14 PM
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I have a similar notch in my fan and I have not had an issue with it yet. Filling it in sounds like a good plan. I asked this question a while back and some one said that because these are balanced impellers a chip is an issue. I could see it being an issues if you were missing say a full blade but a chip that small should not be that much of an issue.
Regards Dave
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'78 911SC Targa (Back In Action!) '00 996 Carrera (New kid on the block) '87 944 (college DD - SOLD) '88 924s (high school DD - Gone to a better home) |
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03-11-2012, 01:18 PM
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Location: Moore, OKlahoma
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mine is alot worse, keep using it!
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Certified Southern Dumbass! 83 911SC with 993 conversion, 98 Ford Expedition 4WD lifted beast, 98 Jeep Grand Cherokee, 01 Ford Taurus, 99 Nitro Bass boat, and a riding lawn mower 
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03-11-2012, 02:01 PM
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i believe that is from someone using a screwdriver to move or hold the fan during belt tightening.
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2003 VW Passat 4 motion 1972 911 Targa 1997 Boxster 1952 H-D K model (dirt track project) Ghosts of a few 914s & Formula Vee |
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03-11-2012, 04:03 PM
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You can take it to just about any auto machine shop that can balance cranks, and they can tell you if they can balance it, or if it really needs it. If really in doubt, send it to Patrick MotorSports in Phoenix- he can balance anything. If you flip the fan over, you can see on the inside of the steel portion of the mount where they balanced it the first time at the factory by the drill points...... Of course, since it's an 11 blade fan, you just can't remove an equal amount on the opposite side like on a jet engine. BTW, that's exactly what was done during the certification tests on the Garrett TFE-731 engine on the Learjet 35. On approach into Hawaii, they took a seagull into one engine- tore up 3 of the fan blades. The sawed off those 3 blades, then sawed off the opposite 3, feathered them all out, and then continued on their trip around the Pacific Rim to put the needed hours on the jet and engines.....
 Tim |
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03-11-2012, 04:34 PM
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I too has a similar chip in one of my blades. Production date of the car as a whole was Oct. '82. The exhaust is stamped Jan. '82. Don't know if there is a way to figure out the build date of the engine, or more specifically the fan. Possibly there was an issue with fans built at a given time......
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The "collection" 1983 911 SC Targa (1 of 1430 imported) 1994 MB E320 Coupe (1 of 825 imported) 1992 MB 190E 2.6 2004 Volvo V70 2.5 Turbo (1 of a bazillion imported) 
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03-12-2012, 05:06 AM
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well, one thing to think about, if there is a vibration issue, it could damage the bearings in the Alt (just a thought, don't really know) and I too had a fan issue on my 88,
 Rather than take a chance, I found one on the PP FS listing, and it is at PowderTech-Plus right now to get coated & make sure this doesn't happen again. $300 is cheap compared to replacing a fan & alt and possible tow.
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Byron  20+ year PCA member  Many Cool Porsches, Projects& Parts, Vintage BMX bikes too |
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03-12-2012, 11:43 AM
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I have two chips like that in my 72 from me using a screw driver like a dumb-ass. Been like that for 15 years with zero issues, so far.
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72 911 Although it is done at the moment, it will never be finished. |
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03-12-2012, 12:18 PM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
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Quote:
 ya need one of these 
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee.
Last edited by island911; 03-12-2012 at 01:39 PM.. |
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03-12-2012, 01:36 PM
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1973 Porsche 911T 3.0
1974 Porsche 914-6 3.0
1988 Porsche 911
1970 Porsche 914-6
1976 Porsche 914 2.0
1987 Porsche 924S
Black Beauty
One of One
Cabby (Last)
"Toad Hall"
1985 Porsche 944
BFG
1955 CMC Speedster
1981 Porsche 911SC
B&B#2
Black Pepper
Tobluforu
