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It’s a 531A

Does it matter which one I get ? They have two listed, spring seat A and spring seat B.

I looked in there, looks like it’s just the seat for the injector. Unless that is supposed to be the seal.

Hey everyone, on the yanmar engines used in the 531/831, is there supposed to be a injector seal, kind of like a copper washer or something along those lines ? I took an injector out today and there was no seal in it but the parts breakdown had two types listed. Parts 17 and 18 in the diagram...