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Author Topic: New Squared Head Lugs not good!  (Read 1220 times)

meilaushi

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New Squared Head Lugs not good!
« on: October 08, 2008, 01:16:46 PM »
I purchased a set of the head lugs with the squared tops that were supposedly a) easier to apply and remove due to the square shank at the top of the lug, and b) stronger than the OEM lugs that hold on the head.  Probably the steel is stronger.  BUT the nut on the lug when tightened is holding on the threads one half of which have been removed by having them half ground off to provide the square shank at the top of the lug.  What this does is make the holding power of the nut and lug half of what it would have been were the nut holding on threads all the way around the lug.  Consequence: one cannot torque the lugs to proper torque without stripping those threads.  I.e., the square ground on the head of the lug essentially makes that lug half as strong as it would otherwise be were the threads not ground off to make a square top.

Essentially this treatment of head lugs is one of those things that looks like a good idea on the surface (easy installation/removal) that, in practice (won't hold the torque), isn't. :(
Ralph Meyer
2008 RE Classic Bullet ES :) "Ennypenny" (It's an Enfield and costs pennies to run!)
2010 RE Deluxe G-5 :)) "Eagle"
2010 BMW F800ST
Ridin' 58 years & counting!  Back roads are fun! Member IBA.

meilaushi

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Re: New Squared Head Lugs not good!
« Reply #1 on: October 10, 2008, 12:50:46 PM »
Will do.   Thanks, Kevin!
Ralph Meyer
2008 RE Classic Bullet ES :) "Ennypenny" (It's an Enfield and costs pennies to run!)
2010 RE Deluxe G-5 :)) "Eagle"
2010 BMW F800ST
Ridin' 58 years & counting!  Back roads are fun! Member IBA.