Nothing I can imagine, that area isn't sealed off completely to begin with. The flywheel is the only important part you don't want it to get rusty if it is still on the block. Not sure where you are but up here everything rusts fast.
If it is still on the truck either remove it and take it inside or spray some WD40 on it to keep the rust at bay until you come back.
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Luvless
1980 Mikado-Sold.
1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride