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MT firewall cracking issue

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Old Dec 3, 2025 | 11:22 AM
  #1  
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MT firewall cracking issue

Hello, Long time listener first time caller.

I have an 87 F250 with the 7.5 and a 4 speed MT, the firewall is cracked/separated causing clutch issues, which as I have read in multiple threads here is common. I have ordered the bronco graveyard bracket, along with their clutch rod repair kit.
I am just curious if anyone has ever used any sort of auto body adhesive such as Fusor 2098, on the engine side of the firewall to attempt to re-secure the panel that has popped loose. I would use the adhesive in conjunction with the bracket.
At the very least I would like to use some sort of adhesive or autobody caulking?? to fill the gap at the top of the engine side panel where the separation has occurred to prevent moisture etc. from entering the cab.

I thought about welding it but I'm not that confident in my welding abilities.

1. Anyone who has used the bracket have you done something similar or think this is necessary?

Thanks - photos for your viewing pleasure.





 
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Old Dec 3, 2025 | 11:27 AM
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From: Bahstun
https://shop.broncograveyard.com/83-...uctinfo/34010/

Add the plate and seal it up
 
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Old Dec 3, 2025 | 11:39 AM
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Originally Posted by knottyrope
Yeah I ordered the bracket a couple days ago.

Mostly curious about what if any adhesive anyone has used to re-seal the engine side, as is visible in the third photo where you can see the seam there quite a bit of separation and the factory adhesive appears to have failed.
 
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Old Dec 3, 2025 | 02:12 PM
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From: Bahstun
TA 31 should work out well to seal it.

They use it to seal the intake plenums on the 7.3 engines.
 
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Old Dec 3, 2025 | 06:40 PM
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From what I remember about Fusor, it really likes a clean surface and doesn’t like dirt. I can’t remember which flavor of fusor I used last. Maybe the variety you listed is more forgiving? The TA might be more forgiving and should do well
 
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Old Dec 3, 2025 | 06:44 PM
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I’ve never dealt with this, but if it’s to seal between the firewall and new plate, would seam sealant work?



this is what I used, messy as hell, but works great!
 
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Old Dec 4, 2025 | 03:59 AM
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I fixed about a thousand
At the dealer we just used 3M seam sealer
Then the repair plates got riveted to the cowl
Yours is bad enough, I would weld it before installing the plate (regardless of your welding experience)
Then grind down the weld so the plate fits flat against the cowl panel
 
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