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Old 09-21-2010, 01:23 PM   #1
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rocker arm keeps loosening up...

i have 1 rocker that wont stay lashed... we have lashed them twice already and it keeps loosening up. we are lashing them to zero the 3/4 turn like suggested. they have poly locks, rockers are proform 1.5's has duel springs and comp 1 piece rods with crane lifters. its getting very agrivating... before this i discovered 2 of my rockers where completely off and trashed so i replaced them with new. the other rocker isnt budging, its just my #2 cylinder exhaust side. during lashing we get the rockers to closed then lash them. is there something im doing wrong?
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Old 09-21-2010, 02:30 PM   #2
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How are you locking the poly locks down? I have found the best method to keeping them tight is adding your preload MINUS 1/16th of a turn, then tighten down the set screw snug (not tight). THEN, turn the poly lock AND the set screw the additional 1/16th of a turn.
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Old 09-21-2010, 03:08 PM   #3
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Are the tops of the studs flat? Are they Proform locks? Did you try switching the lock to another valve and see if it still comes loose? I've never had any trouble setting the lash and then tightening the set screw. For me, Proform does not have the best feeling of quality going for them.
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Old 09-21-2010, 03:25 PM   #4
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quality of these things are crap and they are the proform locks. on that cylinder im putting on a diff lock. this is getting agrivating!!cant wait till winter and i order a nice set of comp rockers!!
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Old 09-21-2010, 03:36 PM   #5
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did you put any red thread lock on the set screw? you can also check the set screws and see if they have the nylock insert in them...

you could go to a local fastener supply place and get some set screws with the nylock inserts, they wont backout..
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Old 09-21-2010, 05:21 PM   #6
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well i cracked into it more and i think when my buddy (who is normaly very good) lashed them he did it on the wrong stroke so we are redoing them all on the 1@tdc method.
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Old 09-21-2010, 05:40 PM   #7
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Quote:
Originally Posted by RamAir95TA View Post
How are you locking the poly locks down? I have found the best method to keeping them tight is adding your preload MINUS 1/16th of a turn, then tighten down the set screw snug (not tight). THEN, turn the poly lock AND the set screw the additional 1/16th of a turn.
I try for 1/8 turn extra on the poly and set screw combined. I've never had an issue in three sets. I would recommend Scorpions. I have two sets of lowmile s/a Promags in the garage, 1.52's and 1.6's.
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Old 09-22-2010, 12:48 AM   #8
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I wouldn't use red lock tite on the poly nuts; blue maybe but you shouldn't need any. I would make sure your studs are torqued down and swap that nut to another cylinder or replace it entirely.
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Old 09-23-2010, 09:54 AM   #9
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I have 1.6 self aligning CNC rockers that just use torqed lock nuts on upgraded studs. Just used plently of blue threadlock and havent had a single problem or needed adjustment in 25k miles. And i dont baby the thing

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Old 09-23-2010, 12:19 PM   #10
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As mentioned in the first reply, jam it! Leave a little preload off and then turn the lock the rest of the way.

Mine have been on for 2+ years and I haven't touched them.
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Old 09-23-2010, 12:19 PM
 
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