Jim,
I just in the process of putting the rad from my Scammell back together, and knowing you had yours apart i have a question.
I'm presuming you had new rubber gaskets made, but did you use any sort of sealer with them?
I'm using a silicone sealant to seal the rubber gaskets and as i do the joint up it seams to push the gasket out, its better since we took it all apart, cleaned it and tried again with less sealer, but is still a problem.
Can the joint be expected to seal with no sealant?
Have you got any pointers?
Cheers, Richard