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10-14-2021, 11:49 AM | #1 |
Senior Member
Join Date: May 2010
Location: Pine, AZ
Posts: 797
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Wobbling Aluminum fan blade
Has anyone had trouble with the aluminum 2 blade fan wobbling on the water pump shaft. Had replaced the water pump and installed an aluminum fan a coupe of years ago. Now the fan blade is hitting the water pump housing at the front of the water pump making a lot of noise. Tightened the nut on water pump shaft holding the fan on, but started wobbling again and making a lot of noise.
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10-14-2021, 01:11 PM | #2 |
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Join Date: Jul 2010
Location: United Kingdom
Posts: 1,447
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Re: Wobbling Aluminum fan blade
some of the waterpumps being sold are not absolutley accurate castings and need their "snout " fettling to accomodate the fan pulley area.... well I blame the w/pump but it could be the fan not being accurately made I suppose. Also I find that after a few miles the nut holding the fan onto the shaft can be tightened up a smidgin.
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10-14-2021, 01:42 PM | #3 |
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Join Date: May 2010
Location: Southern California
Posts: 3,134
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Re: Wobbling Aluminum fan blade
Make sure you have a thin steel washer under the nut otherwise the vibration may allow the nut to gaul the aluminum and cause the fan to wobble.
Tom Endy |
10-14-2021, 05:46 PM | #4 |
Senior Member
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Re: Wobbling Aluminum fan blade
Your tapers don’t match. Tightening the nut does nothing. Get a new fan that fits tightly on the shaft and matches the shaft taper. Don’t run you fan belt tight. As loose as possible that will still run your generator. A tight belt will hammer out the taper on the fan hub.
Or, get some shim stock and fit it place to make a better match to the taper. That’s usually a field fix to get you home. Have a lot of bandaids. Those shims are sharp. Good luck. |
10-15-2021, 07:38 AM | #5 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 4,002
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Re: Wobbling Aluminum fan blade
Use the washer as noted. Trim the nose of the water pump as needed. Check the taper without the key. It should not rock even without the nut on. Glue the fan onto the shaft (with the key installed) using Loctite. Use the Loctite that is recommended for retaining bushings tipe 638. Do not over tighten the fan belt. Check the nut after the first 50 miles or so.
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10-15-2021, 09:38 AM | #6 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,484
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Re: Wobbling Aluminum fan blade
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A dial indicator is the best way to check the shaft for off taper or runout. |
10-15-2021, 10:13 AM | #7 |
Senior Member
Join Date: May 2010
Location: Pine, AZ
Posts: 797
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Re: Wobbling Aluminum fan blade
Thanks for the info. Think I will purchase a new fan and water pump, then check the fit before installing. AZ Model A's should be able to supply good parts.
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