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My understanding was..
That at some point the valve bodys changed. So, say my 1986 model would require a different valve body, either new or used. Then, MB published the modifiication in their service litature.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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