I have an LD28 Industrial Engine Service Manual and a 1982 Datsun 810 Parts Catalog and I think I'm pretty clear on how the engine is put together except: The Parts Catalog have more injector related parts than appear in the Service Manual.
Both the Service Manual and the Parts Catalog show the injector (from top down) consisting of: a threaded "el" with two ears for the studs in the head, one or more shims, a spring, a push rod, a spacer or "Distance Piece", a nozzle assembly consisting of needle and seat and finally a retaining nut that screws to the top "el'' and holds all the above pieces together. Under the injector goes what the Parts Catalog identifies as a "Gasket" that I assume is the item the Service Manual calls a "small washer".. that "..should be installed in the specified direction" -- a new one of which should be installed whenever an injector is installed. The small washer appears to be the Parts Catalog item identified as a "Gasket 16617-V0700"
My confusion is that the Parts Catalog contains a listing for 4 additional parts that appear to go under the injector. The parts are listed as
[*]Washer-Nozzle 16625-V0701 [*]Gasket-Nozzle Top 16626-V0702 [*]Support-Nozzle 16650-V0700 [*]Gasket-Nozzle Case 16651-V0700
I'd appreciate whatever information you all might have.