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Old 08-21-2011, 04:11 PM
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torque specs for locking nuts on rocker arms

I have locking nuts on the rocker arms, after setting the valves and the nut is where I want it is there a certain torque on the allen head jam nut in the center? if so what is it i cannot find a torque spec anywhere!

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Old 08-21-2011, 04:16 PM
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never known of any torque specs on that part.

It's a jam-nut set-up, I have never torqued the allen head down on those you are talking about polylocks right ? JMO
When you get them where you need them just hold the nut part with the wrench and tighten down the center allen head as snug as you can get it without letting the other part move.


Cole
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Old 08-21-2011, 04:24 PM
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Cole,
Thanks for the info brotha!
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Old 08-21-2011, 04:44 PM
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I get my set a little off my clearance goal, when I tighten it brings it into spec.
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Old 08-21-2011, 04:51 PM
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Torque

I have seen many poly-lock nuts broken by over tightening the set screw. All you need to do is snug them up or no more than 15 lb/ft if you have the correct rocker studs. If you are using stock rocker studs, you may not be able to get the set screw to hold the lash setting. You need ARP studs that have a flat end to evenly distribute the pressure from the set screw. It is easy to over tighten the set screw in an attempt to hold the lash setting if you are using stock rocker arm studs.
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Old 08-21-2011, 05:07 PM
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I've never seen a poly lock nut broken, but I have seen more than one come loose from not being tightened enough. Not all studs are ARP. I agree ARP is the best, but if he doesn't have them it doesn't mean he can't keep the locks set.
What I have done with hydraulic tappets is after I get the nut where I want it, I back it off ccw about 5 degrees(no more), set my allen set screw pretty tight without moving the nut, then turn both cw about 5 degrees at the same time. I haven't had one loosen up yet doing it like that. I can't guarenty that it won't break the nut. I will bet that it doesn't come loose by itself like they do when you just tighten the set screw. Do one head one way, the other head the other and see for yourself.
FWIW
ssmonty

Last edited by ssmonty; 08-21-2011 at 05:13 PM.
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Old 08-21-2011, 05:10 PM
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Quote:
Originally Posted by 68NovaSS
I get my set a little off my clearance goal, when I tighten it brings it into spec.
X2 this is actually how i do it.


Cole
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Old 08-22-2011, 01:19 AM
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Thanks for the info guy's, They are stock rocker studs and I have had an issue with them not holding the lash. I am off to buy some ARP studs tomorrow! thanks once again for the info and responses

God bless

Ryan
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