Originally Posted by Graham

Great to hear you got her running!

Bit puzzled by "Turns out the injectors 6 & 7 did not seat correctly and there were huge vacuum leaks there. I got them to seat, but I can still hear some hissing, so likely I will try a different type of seal (round instead of square cross-section)."

The proper seal for where the injector goes into the manifold is, according to manual part 116 078 04 73. So called top hat seals. I use those on my 72 M117.



There are the other kind used on some cars 116 078 07 73. (So called green seal)



These latter ones were apparently used on California models from engine # 019517
Federal models from engine # 026126.

Originally Posted by Adv_rider

Yesterday I replaced my injectors on the 72 W108... I found out the PO installed both seals simultaneously ....

Originally Posted by Tomguy

The top "Seal" isn't a seal, as it doesn't seal anything. It is only a retainer ring. The circlip can be obtained from any hardware store I'd imagine, such as Lowe's etc. If Lowe's doesn't have, True Value likely would. Just take one of the older ones with you that's good for sizing.

Originally Posted by Graham

Not sure if I understood, but the green ring in the seal pictures may look like the upper ring, but as Tomguy said, the upper ring is not a seal just a cushion for the clamping bracket. The green ring takes the place of the top-hat seal on a small number of cars.

The manual is a bit confusing, but on page 215/3 it shows the two types of seals. For the top hat seal (2nd pic), it also shows the rubber ring that goes under the clamping bracket.

epc is not too clear, but it seems the circlip may be part N000471024000. One on line source describes that part as 'Circlips 24x1.2' so that is probably the correct number.