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Old 01-24-2009, 11:29 AM
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Thread-lock on poly-locks?

Do people usually put a thread lock compound on the allen-head locking screws for rocker-arm adjusting nuts, polylocks or whatever you call them. I would think it would be nice not to have to worry about one of those screws coming loose and getting into the crankcase.

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Old 01-24-2009, 12:11 PM
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I would not use threadlocker..Stripping out a setscrew because it is locked in can make a ton of work for you. The whole point of the polylock is to keep the nut in place.

Tighten it down to the proper torque and you will have no problems.

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Old 01-24-2009, 07:21 PM
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Thanks Mike
I just read on another forum about the "extra 1/4 turn" method and I will use that. Says you set the lash (hydraulics) a quarter turn light and then crank the nut another 1/4 after you tighten the set screw.
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Old 01-24-2009, 11:41 PM
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Poly locks are more consistent when the ends of the rocker arm studs are nice and flat. It gives me a little more peace of mind. Some cheap studs are not finished as nicely.

Setting rockers with hydraulic cams is way more forgiving with poly locks vs. a mechanical. It's like splitting hairs.

That 'extra quarter turn' is really stressing that set-screw. Some poly lock mfr's give a torque spec for the main rocker nut, after the set-screw is tightened 'snug'. Usually the spec is reached far before a quarter-turn.
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Old 01-25-2009, 08:37 AM
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I'm looking at the instructions that came with my Comp roller rockers, which include polylocks, and they say to "hold the polylock with a wrench and tighten the set screw with a T-handle or Allen wrench." Period. No thread-locker, no torque spec. With a T-handle or Allen wrench, one would not be able to put much torque on the set screw.
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Old 01-25-2009, 10:31 AM
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That sounds like good advice then, I'll forget the 1/4 turn. The studs aren't perfectly flat but they're going to have to stay the way they are because the heads are on the engine and I'm not going to go grinding on them.

Thanks!
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