[Walt Fricke]

For the pump drive, you could just pull the cap on that side and install the seal. Any or no cover would then be fine. I've got a 2.8 with a cam with a drive end, and leaving that part hanging out hasn't caused problems, though a simple cover keeps the dust off. You wouldn't want to leave out the seal and expect a cover to do the job of keeping the oil where it belongs, though.