I found a copy of the 1986 Toyota Land Cruiser Factory Services Manual (FSM) for maintenance procedures somewhere online a few years ago (I think on ih8mud but I can’t remember.) It’s hard to find electronic copies of these things so I thought I would repost it here. It’s a large file, 96.4MB, so I put it in my dropbox. Here is the link to download it:
It has maintenance info for the 2F, 3B, and 2H engines.