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cam chain tensioner oring is toast

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Took my manual cam chain tensioner off today, and saw that the large oring, the one that sits against the bore, is in pretty bad shape. Anyone know the size of that oring so I can replace it? Could not find the oring in the Thumpertalk parts store. 

 

Thanks

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Measure it or take the old one as a sample to the store.

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I keep meaning to replace the lock nut and o-ring with a copper washer and nylock nut to see if the nylock will seal to the threads.  So far it hasn't leaked enough to matter.

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Mine has always leaked through the small oring. That's not a big deal. I noticed the large oring while doing a valve adjustment. I haven't run the engine yet to see the effect of this oring since I also need to have my radiator repaired.

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