Re: What's best? Left or right hand threads on cam

Posted by Bob M on December 06, 2004 at 08:41:38 from (151.190.254.107):

In Reply to: What's best? Left or right hand threads on camshaf posted by hairy on December 05, 2004 at 09:43:22:

For this application don’t think there’s much advantage of one thread direction over the other. I’ve seen the cam nut unscrew on both right- AND left-handed threaded C2xx engines. (Incidentally when the cam gear hub broke on my Super M I discovered it had a left-hand threaded cam gear nut. Apparently it had broken before and the cam then replaced with a 450 cam?).

Anyway the bottom line keeping the nut on is not so much a function of which thread it is, but rather of proper installation: 1 – When assembling make sure the cam nut is properly torqued. 2 – Use a NEW keeper plate under the nut, then bend it up fully to catch the nut flats in 3 places 120 deg apart after the nut is final torqued. 3 – Make sure the hydraulic pump relief valve is in place and properly set. (It should bypass above 1,200 psi). If the relief is missing or adjusted too high it puts extra stress on an already highly stressed part (the cam gear) which can then cause the gear hub to break or the nut work loose.

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