on my 79 TD na 617, the seals were at the bottom of the injector seat. one of them was so carboned up, that it would not come out without major cleaning, and scraping... the bottom of my injector seats was convex, and the shields/seals, were flat with a small 1/4" approx hole drilled in it. the PC hole looks cast as opposed to drilled.
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!