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budyerly(at)msn.com
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 Posted: Mon May 06, 2019 7:42 am Post subject: Airmaster Spinner front bulkhead non adjustable model. |
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Johnathan,
It sounds as if your front bulkhead is the old style which is not adjustable. That is OK. The best way to make a permanent fix is to clean the inside of the spinner, apply a thin layer of oil or release agent to the spinner, then apply RTV around the cap bulkhead. Push on the spinner and bolt it down and it will make contact and seal up that gap. Remove after cure and trim for a neat finish. Keep in mind that automotive RTV or silicone sealant against aluminum will corrode the aluminum during cure as most contain citrus acid (i.e. that acid taste) so you may consider using a non-acidic or neutral cure type RTV such as Dow737.
Another way which I have never done, is to apply silicone sealant to the motor cap, so the bulkhead is proud of the end cap and push the spinner on and bolt down. I have never done this as the plastic bulkhead still rubs directly on the aluminum causing eventual wear as seen as aluminum dust. RTV is softer and less abrasive under vibration.
Bottom line is if the gap is too large, the spinner screws will eventually wear and that is a fatigue source for an eventual crack in any spinner.
Best Regards,
Bud Yerly
Sent from Mail for Windows 10
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area
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| Posted: Mon May 06, 2019 3:30 pm Post subject: Re: Airmaster Spinner front bulkhead non adjustable model. |
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Thanks Bud,
Excellent advice, as always.
Best wishes,
Jonathan
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