1937 Terraplane crankshaft dampener

barrysweet52
barrysweet52 Expert Adviser
edited November -1 in HUDSON
I recently pulled off the vibration dampener and noticed a badly worn/damaged thin brass bush that slides over the crankshaft and fits in the back of the dampener. Curious why its there, whats its purpose and can it be left off. Appreciate a few responses. Regards, Barry

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  • [Deleted User]
    [Deleted User]
    barrysweet52 wrote:
    I recently pulled off the vibration dampener and noticed a badly worn/damaged thin brass bush that slides over the crankshaft and fits in the back of the dampener. Curious why its there, whats its purpose and can it be left off. Appreciate a few responses. Regards, Barry
    Hi again Barry---This was merely a locking device for the vibration dampener nut. It had tabs that were to be bent over the nut after tightening & was not critical to leave off if you use something else to lock the nut on with.---Cliff Minard.
  • Unknown
    Unknown
    barrysweet52 wrote:
    I recently pulled off the vibration dampener and noticed a badly worn/damaged thin brass bush that slides over the crankshaft and fits in the back of the dampener. Curious why its there, whats its purpose and can it be left off. Appreciate a few responses. Regards, Barry

    The lock washer with the tangs does not go behind the dampener but between the dampener and the nut or bolt that holds it on. At least on the 46/47s. A bushing or sleave goes between the dampener and the crank timeing gear for the seal to fit. I may be wrong as have been before.
  • barrysweet52
    barrysweet52 Expert Adviser
    Thanks for the info. It makes sense that it was to lock the nut. The brass washer/bush is so worn with lugs missing that its not doing anything. Im surpised it was put back on. Regards, barry
  • drdoug
    drdoug Senior Contributor
    barrysweet52 wrote:
    Thanks for the info. It makes sense that it was to lock the nut. The brass washer/bush is so worn with lugs missing that its not doing anything. Im surpised it was put back on. Regards, barry



    Barry,on this year of engine,there is only a brass washer. This washer has a lip on it also,but it does not have any ears. If you find a washer with the tabs,it will not fit over the crankshaft bolt. I am not sure why it was this way,but they are. I also am not sure when they changed to the later style,but my guess is in 1940. The bolt which is on your engine should have the slot for the hand-crank, but also has a machined shoulder that fits this brass washer,and when put together,kind of serves as a lock,because the brass is soft. Make sure to tighten this bolt to specs. I also make sure everything is very clean[threads inside and out] and use a touch of loc-tite. Also when using an aluminum gear,there is a procedure you must do to accomodate this upgrade. Also don't forget,the aluminum gear is 20degrees and requires changing the lower crank gear also. Hope this helps.
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