Another method here is to cover the tranny with plastic and put the cover on
and shoot the stuff into the void between the gearbox and the cover. The
plastic keeps the foam from sticking to the gearbox and you get a "Form-Fit.
It reduces the amount of cutting that is required to make it easy to
remove and install while keeping that hard crust that forms on the foam.
Joe
Douglas Braun & Nadia Papakonstantinou wrote:
>
> A few months ago I lined my tunnel cover with that foam-in-a-spray-can
> stuff you can get at hardware stores.
>
> It turned out to be a lot of work, mostly because the stuff expanded
> a lot more than I expected, and I had to carve away about 2/3 of
> the foam that I applied. Also, it shrank a bit as it hardened,
> and the tension tried to pull the sides of the cover towards each other,
> cracking the front rim in a couple of places. (I reinforced it with
> epoxy and fibreglass strips.)
>
> The final result was excellent, though. The cover is a lot firmer and
> better damped. And even after driving in city traffic in 85-degree weather,
> the sides and top of the cover are barely warm (while the firewall is too
> hot to touch!)
>
> Some tips, if you decide to try it:
>
> 1: Use a minimal-expanding foam to avoid having to carve out too much
> later. When you carve it, you lose the "skin" that gives extra
> strength and protection.
>
> 2: Study where parts of the transmission get close to the
> cover, where you will probably have to carve a little anyway.
> Also note that to get the cover on and off, you have to keep
> the foam quite thin along the very top (like 1/2" thick).
> I have O/D, which meant a lot more carving towards the rear.
>
> 3: Attach a temporary brace (e.g. a piece of wood) between the front
> bottom corners, to maintain the cover's shape.
>
> Doug Braun
> '72 Spit
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