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Joe K · 04-30-2020, 09:47 AM

If they're like mine they operate according to the "nylanut" (aka Nyloc) insert principle which is a deform-able plastic insert which goes to increase the "residual torque" which prevents movement after adjustment. On these you "set it & forget it"

One of the downsides of the two nut version is that moving the locknut into position and achieving the residual torque (jamming) will change the setting - one has to "play around with it" until one gets precisely the clearance required. The one nut version doesn't have this downside perhaps trading it for the possibility of moving?

The rebuilder who did my engine would do either and preferred the single nut version simply because of the ease of adjustment. "I've never had one move with well over a thousand of my rebuilds out there" he added for emphasis. "Plus I'll have to get $100 extra for the time I spend if you want two nuts."

It was an easy (and successful) choice for me.

If examining yours brings you to a different thought - then I'm sure Bratton will help.

Joe K

04-30-2020, 09:47 AM	#2
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: One Nut Adjustable Vavle lifter If they're like mine they operate according to the "nylanut" (aka Nyloc) insert principle which is a deform-able plastic insert which goes to increase the "residual torque" which prevents movement after adjustment. On these you "set it & forget it" One of the downsides of the two nut version is that moving the locknut into position and achieving the residual torque (jamming) will change the setting - one has to "play around with it" until one gets precisely the clearance required. The one nut version doesn't have this downside perhaps trading it for the possibility of moving? The rebuilder who did my engine would do either and preferred the single nut version simply because of the ease of adjustment. "I've never had one move with well over a thousand of my rebuilds out there" he added for emphasis. "Plus I'll have to get $100 extra for the time I spend if you want two nuts." It was an easy (and successful) choice for me. If examining yours brings you to a different thought - then I'm sure Bratton will help. Joe K __________________ Shudda kept the horse.