Warning I did not spellcheck!
If you got the complete rebuild kit it will have the large but thin copper crush washer for the big plug. I believe it takes a 30mm wrench (recheck the size on that) to remove that plug assuming ou want to remove it.
It has been a long time. I think I used a short stubby combination wrench for that one that is hard to get at. Can't remember if it is 7,8,9 or 10 mm.
It is a good idea to back of each nut a little and then go to the next and on around to keep the flange from cracking. Because the pump may or may not be under spring tension and the flanges is thin and can be brittle.
If you put the Lift Pump in a vice again keep the jaws away from the flange.
Back to that larger plug that needs teh 30mm wrench or socket. You don't need to remove it but then you cannot inspect the spring and piston.
The hex on the darn plug is so thin that a Cocket or the box end of a combination wrench may be tapered too much to get a good grip on the hex. I hae a socket and I put it on a belt sander and too away the tapered part.
When I worked in a fuel we had the special wrench for that 30mm plug. It was just made of stamped metal just as thick as the hex on the plut. You put it on the plug and tapped the handle with a hammer and the plug loosened. And you did that with the Pump still attached to the Fuel Injection Pump and did not need to worry about it in the vice.
In fact if there is room for you to do so loosen all of the fitting or caps on the pump if you can while it on the fuel injection pump. But, don't be brutal.
After that the darn pump does not want to stay in the vice and it is good to have some aluminum or copper vice shields. Again you need to protect the pump flanges from breaking.
There is a tiny O-ring that goes in a bore where there is a rod that pushes on. The groove for the O-ring is actually inside of the bore and you need to carefully pick out the O-ring and even more carefully install the new one. You need to be careful because if you push it in too far you are gong to need to remove that 30mm Plug I was speaking of to get inside and get it out.
In order to get at the push rod you need to remove a roller tappet and there is sort of a C wire spring that goes around the casting you need to remove.
For more pics see post #11:
http://www.peachparts.com/shopforum/diesel-discussion/356205-can-617-injection-leak-into-oil.html