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31 Nash 871 engine vibrations

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A friend here in Norway has this 31 Nash 871 Convertible Sedan that despite its renowned 9-bearing crankshaft has annoying vibrations at certain road speeds, e.g. around 40 mph. Has anyone experienced disintegrating vibration dampers on these engines or have other tips for what to investigate?


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According to the repair manual the vibration dampened can cause a vibration at about 40mph then again at 60 mph. Cause is generally rust,corrosion.  

I have the manual and will try to find. We are moving and many things packed.


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23 hours ago, 31nash880 said:

This comes from Nash service manual 1936-1939. May be helpful.


Much appreciated lead. Is there any more to this procedure on the Manuals next page?

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