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  #1  
Old 02-03-2020, 10:36 AM
dwranda dwranda is offline
 
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Location: Jamestown,NY
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Default Tips needed for dimpling completed firewall

I am trying to hang my oil cooler and would like to put nut plates in so removal will be easier in the future. Want nut plates behind everything on the firewall to ease removing from the front only. I would need to dimple the firewall where there is the angle support behind it. Obviously I can't just use the dimpler that uses the rivet puller. Is it OK to countersink these even though the firewall is so thin?
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  #2  
Old 02-03-2020, 10:58 AM
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Carl Froehlich Carl Froehlich is online now
 
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The short answer is no - just use AN3 bolts and nuts.

But - I always use a piece of 0.063? 3/4?x3/4? angle to mount the cooler, the angle then is bolted to the firewall where, as you suggest, there is supporting structure on the cabin side of the firewall. If you still want to use nutplates, put the nut plates on the angle, the angle still bolted to the wall.

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  #3  
Old 02-03-2020, 11:14 AM
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bjdecker bjdecker is offline
 
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Ditto what Carl said

You want to be able to remove the oil cooler from the mounting angles. Put the nut plates on the 3/4" aluminum angle corresponding to the holes in the oil cooler flanges (6 total -- 3 top, 3 bottom).

I used AN525 screws to mount the ends & middle of each mounting angle to the firewall and underlying stiffeners. The AN525 has a lower profile head than the AN3A bolt so I could get the oil cooler and its fiberglass plenum right up to the apex of the mounting angle without interference.

Cheers!
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  #4  
Old 02-03-2020, 11:43 AM
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N941WR N941WR is offline
 
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I used a pop rivet dimpler to install platenuts. Then you can bolt it to the firewall.

Honestly, I would reinforce the #4 baffle and mount the oilcooler there, as thousands have done.
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Old 02-03-2020, 12:19 PM
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Brockster Brockster is offline
 
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I don't think other posters understood your question. Because it appears the aluminum support angle is already riveted to the firewall you are asking if countersinking for a flush rivet to hold nut plate is an option. It isn't. Essentially this would remove the stainless metal layer completely. If you could still remove the aluminum support angle and install the nut plate in that alone there by causing the flush rivets sit under the firewall skin. As long as nut plate would never need to replaced this would work. I would use an AN3 bolt along with a nut and move on. You won't really need to be removing it once installed.
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Old 02-03-2020, 12:50 PM
dwranda dwranda is offline
 
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Thanks guys I was hoping there was some procedure I didn't know about but looks like I will just be using nuts and bolts. I figured the oil cooler mount wasn't something I was going to be removing very often or maybe even never but thought I'd look into it anyway.
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Old 02-03-2020, 03:45 PM
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Don't give up yet. Depends on how bad you want a nutplate there.

You have two flush rivet locations available already. Drill them out. Make a thin plate with holes for those two rivet locations. Put a nutplate on that plate. Rivet this new plate into position. Done.

You are essentially making a special nutplate with long ears to reach the flush holes you already have.
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Last edited by rzbill : 02-03-2020 at 03:48 PM.
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Old 02-03-2020, 04:21 PM
dwranda dwranda is offline
 
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Quote:
Originally Posted by rzbill View Post
Don't give up yet. Depends on how bad you want a nutplate there.

You have two flush rivet locations available already. Drill them out. Make a thin plate with holes for those two rivet locations. Put a nutplate on that plate. Rivet this new plate into position. Done.

You are essentially making a special nutplate with long ears to reach the flush holes you already have.
Duh yeah why didn't I think of that. If I decide I really want the nutplate there I will do it that way.
Thank you!!
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  #9  
Old 02-03-2020, 05:31 PM
Taltruda Taltruda is offline
 
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Default Clickbond

Wouldn't this be a perfect candidate for clickbond fasteners?
https://images.app.goo.gl/bkWGJH1H7qste6Y56
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  #10  
Old 02-03-2020, 06:08 PM
agent4573 agent4573 is offline
 
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for my own curiousity, would a doubler plate and riv-nuts work? Put the doubler on the inside of the firewall and then use the riv-nuts to hold it in place and mount the oil cooler with a bolt?
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