[peewee2you]

If you have a U-Haul company nearby, they have these relatively cheap mover blankets, you could drape them over the engine and tuck them down the sides of the engines, at this point nothing can hurt a little extra care. Uhaul furniture blanket pad 68" x 85" $7.95. These are the blue ones, a few years back also had these other ones gray in color were even cheaper but good for cold, I used them to cover my pool equipt. outside during a cold snap, probably no where near as cold as you are encountering, but like I said, can't hurt.