 Cooling Fan Balance Questions |
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| aggiezig |
 Feb 18 2026, 11:56 AM
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#1
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Porsche Wannabe  Group: Members Posts: 320 Joined: 13-January 16 From: Austin, TX Member No.: 19,557 Region Association: Southwest Region 
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Does anyone happen know how the cooling fans were balanced from the factory?
I took mine apart to refinish (Cerakote!) and very stupidly did not make any index marks for the front "ring" and back fan. I noticed on reassembly that there is a weight crimped under the ring lip, presumably for balance. I'm wondering if these pieces were balanced independently (unlikely) or as a unit... (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.1.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.2.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.3.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.4.jpeg) Any ideas from 914world on how I may find the right orientation / re-balance? My local machine shop said no dice as far as fitting it on any of their machines (ID of the fan shroud bore is too small). |
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| 930cabman |
Feb 18 2026, 12:34 PM
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#2
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Advanced Member Group: Members Posts: 4,498 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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I'd bet the assembly was balanced, have you sent the crank for balancing?
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| Jack Standz |
Feb 18 2026, 02:26 PM
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#3
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Senior Member Group: Members Posts: 707 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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QUOTE(aggiezig @ Feb 19 2026, 12:56 AM)  Does anyone happen know how the cooling fans were balanced from the factory? I took mine apart to refinish (Cerakote!) and very stupidly did not make any index marks for the front "ring" and back fan. I noticed on reassembly that there is a weight crimped under the ring lip, presumably for balance. I'm wondering if these pieces were balanced independently (unlikely) or as a unit... (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.1.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.2.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.3.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-19557-1771437363.4.jpeg) Any ideas from 914world on how I may find the right orientation / re-balance? My local machine shop said no dice as far as fitting it on any of their machines (ID of the fan shroud bore is too small). Don’t know what those last couple sentences mean. It’s a very good idea to balance everything in your motor that rotates. Flywheel, crankshaft, rods, pistons/rings/pins, etc. That means get that fan balanced. Have seen pictures of an exploded fan and it’s not something you’ll enjoy. Dynamic balance all of it and if your shop can’t or won’t do it, send to someone who can (DPR?). |
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| mgphoto |
Feb 18 2026, 04:34 PM
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#4
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"If there is a mistake it will find me" Group: Members Posts: 1,401 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
If you took the fan apart and didn’t assemble it the exact same way then you have to rebalance the fan, I would include the hub, crank and the rest of the rotating assembly.
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| bdstone914 |
Feb 18 2026, 05:09 PM
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#5
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bdstone914 Group: Members Posts: 5,257 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
In addition to balance the ring has to be centered on the fan or it will rub the shroud.
Test fit it and see if it clears. If not loosen the bolts and teap the ring until you have equal clearance on all sides |
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| TRP |
Feb 18 2026, 05:20 PM
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#6
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Member Group: Members Posts: 212 Joined: 2-September 23 From: Morgan Hill, CA Member No.: 27,559 Region Association: None
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Oh man, I was going to do the same thing with my fan (Cerakote), but I wanted to figure out how to make sure it was indexed the right way afterwards. In the end I kind of looked at it and said "it'll be fine all dirty".
I did notice that my fan doesn't have any of the timing marks on it, that seems like it's going to be a problem. |
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| 930cabman |
Feb 18 2026, 05:25 PM
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#7
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Advanced Member Group: Members Posts: 4,498 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(bdstone914 @ Feb 18 2026, 06:09 PM) In addition to balance the ring has to be centered on the fan or it will rub the shroud. Test fit it and see if it clears. If not loosen the bolts and teap the ring until you have equal clearance on all sides changing the relationship between the hub (fan) and the pulley will affect the balance. It's possible everything will be fine, but it's a gamble. Yes, the clearance must be equal |
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