I rented the clutch plate puller from Autozone again so I can soap bubble test the main shaft seal. No bubbles! It's going in!

Should there be a cap on the center bolt to keep the threads from rusting out?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked