Under cowl foam seal

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Under cowl foam seal

delco1946
Morning, I’m sure I’ve seen this post before but can’t find it. I took my cowl out ages ago and like an idiot I glued my new hood to cowl seal to the firewall, not thinking about reassembly .

Fast forward to today, I bought screening to glue to the underside of my cowl slits but I still haven’t found a good replacement for the foam under the cowl and I’d like to reassemble it today. I’m worried the super soft foam from Home Depot for weatherizing might soak up water and cause more harm? Also, it seems to glued to the cowl and to top of the firewall. What have others used? Is there an auto purposed foam for this purpose?
1981 F250 Ranger XLT 4x4 trailer special 351M, and auto C6 tranny
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Re: Under cowl foam seal

ArdWrknTrk
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Garage door bottom seal.
If it can sit in slush and rain for years, it can keep water out of your air cleaner.

Frost King and MD both work fine.

Contact adhesive or 3M weather strip adhesive to seal it to the cowl.
You could also use Household Goop or Shoe Goo.
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.
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Re: Under cowl foam seal

delco1946
I think you’re thinking I meant the actual hood to cowl seal (?) which I have (bought from bronco graveyard- expensive but seems high quality for anyone in a similar boat). But regardless I’ll prolly try some rectangular/ squarish foam insulation unless a better idea comes along.
1981 F250 Ranger XLT 4x4 trailer special 351M, and auto C6 tranny
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Re: Under cowl foam seal

ArdWrknTrk
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I am meaning that.

Are you talking about the heater plenum seal?
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.
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Re: Under cowl foam seal

Steve83
In reply to this post by delco1946
Closed-cell foam doesn't soak up water - it's the correct modern replacement for the original junk.  Read this caption and the PREVious/NEXT several:

Walk softly and carry a BIG SIX!!!
https://www.supermotors.net/registry/2742#album
Memphis, TN, USA, Earth, Milky Way
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Re: Under cowl foam seal

delco1946
Oh ok, sry was having a hard timing visualizing it. I was thinking the foam would need to be thicker to fill the gap but looks like it’ll work! Thank you both :)
1981 F250 Ranger XLT 4x4 trailer special 351M, and auto C6 tranny
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Re: Under cowl foam seal

FuzzFace2
Funny you asked this as I just did this on mine today.
I used the closed cell foam you get at the big stores, Lowes for me here.

There was the outline of the old one on the vent so I followed it.
I was thinking when I pulled it off the roll it had paper still stuck to it that is had glue on both sides of the foam. It does not the paper is so it will not stick to it's self when coiled on the roll.

BTW that cowl vent to fire wall seal as I would call it is so heat from the engine bay and any fumes do not get into the cowl and in to the cab of the truck.

The firewall to hood seal kind of does the same but also keeps water off the back of the motor when it rains or gets washed. This is where the garage door seal is used.
Dave ----
81 F100 flare side 300 six/T18 project
http://cars.grantskingdom1.com/index.php/1980-Ford-F100?page=1
81 F100 style side 300 six/SROD parts truck
http://cars.grantskingdom1.com/index.php/1981-Ford-F100
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Re: Under cowl foam seal

ArdWrknTrk
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In reply to this post by delco1946
Late in reply but...
Use the black neoprene tape intended for refrigeration lines and pipe wrap.
It's conformal and closed cell.

And yeah, buying a hood seal is stupid expensive when a $10 garage door seal will do two trucks.
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.