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Greg McFarlane
Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia
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 Posted: Mon Feb 03, 2014 2:47 am Post subject: Fab Box |
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Not new ideas but could be of interest. The fab box & filter is mounting as per plans, plus, to improve the integrity of the filter sealing a 63 aluminium plate is epoxied and riveted to the outside bottom of the fab. (countersunk rivets inside under filter) Four -3 bolts through the bottom plate just inside the filter and through the top attachment plate holds everything in place and prevents the fab box with heat/time etc from stretching and the filter becoming loose allowing dirt etc to be ingested by the engine. By sizing the bolt length carefully allowing for a washer on the bottom bolt head and the nylock nut on top, the bolt when tightened and "bottomed" out on its threads can put enough pressure to seal but not enough to crush the filter. The four bolt heads are shown unpainted in photo. The 63 added plate also makes for a better attach for the alternate air door which is epoxied & riveted with solid rivets, to reduce the risk of rivets becoming loose and being sucked up into the engine. To improve the door seal epoxy/flox is layed up for the door to close on, the spring stops vibration and helps the seal. Cheers from Western Australia.
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dave.saylor.aircrafters(a
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| Posted: Mon Feb 03, 2014 7:31 am Post subject: Fab Box |
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I did something similar after my filter wore through the FAB, except I put the plate on the inside. I only used (alot of) proseal to attach the plate, so no extra fasteners. And I did rivet the alt air ring to the plate and the FAB.
I use a thin bead of silicone around the edge of the alt air valve. That keeps it from jiggling around, similar to your spring, and also seals it up well. I consider it an emergency item so I only check it at the annual and I just accept that it has to be reset as a maintenance item.
Dave Saylor
831-750-0284 CL
On Mon, Feb 3, 2014 at 2:47 AM, Greg McFarlane <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)> wrote:
[quote] --> RV10-List message posted by: "Greg McFarlane" <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)>
Not new ideas but could be of interest. The fab box & filter is mounting as per plans, plus, to improve the integrity of the filter sealing a 63 aluminium plate is epoxied and riveted to the outside bottom of the fab. (countersunk rivets inside under filter) Four -3 bolts through the bottom plate just inside the filter and through the top attachment plate holds everything in place and prevents the fab box with heat/time etc from stretching and the filter becoming loose allowing dirt etc to be ingested by the engine. By sizing the bolt length carefully allowing for a washer on the bottom bolt head and the nylock nut on top, the bolt when tightened and "bottomed" out on its threads can put enough pressure to seal but not enough to crush the filter. The four bolt heads are shown unpainted in photo. The 63 added plate also makes for a better attach for the alternate air door which is epoxied & riveted with solid rivets, to reduce the risk of rivets becoming loose and being sucke!
d up into the engine. To improve the door seal epoxy/flox is layed up for the door to close on, the spring stops vibration and helps the seal. Cheers from Western Australia.
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