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Old 10-14-2021, 11:49 AM   #1
jrelliott
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Default 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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Old 10-14-2021, 01:11 PM   #2
johnbuckley
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Default 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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Old 10-14-2021, 01:42 PM   #3
Tom Endy
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Default 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.

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Old 10-14-2021, 05:46 PM   #4
Jacksonlll
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Default 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.
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Old 10-15-2021, 07:38 AM   #5
nkaminar
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Default 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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Old 10-15-2021, 09:38 AM   #6
rotorwrench
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Default Re: Wobbling Aluminum fan blade

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Either taper could be off center. There have been water pump shaft irregularities before with some restoration parts. The fan bore taper is generally reamed but if the bore was off center then the whole thing is off center. A bent shaft or blade could also figure into the problem. Cast aluminum doesn't bend easy but it can bend on thin castings.

A dial indicator is the best way to check the shaft for off taper or runout.
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Old 10-15-2021, 10:13 AM   #7
jrelliott
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Default 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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