Please explain what you mean here: Engine serial # is 8512917 C making it a 3rd and last series perkins for the 1850 by my records. Late 1850 tractors used the second method of Perkins engine I. D. (The 354 U numbers) Your engine does not have a build number so if you ask a Perkins dealer and you get a younger parts man he will be lost since you don't have a build number. Where are you located? I know several older Perkins dealers to check. Also I am going to bear other bad news. I think it might be wise to replace that liquid dampner. They are not cheap!, but neither is a new crankshaft.
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