Adjustable Roller Rockers

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JoeSBP

JoeSBP

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Checking a set of adjustable roller rockers with hydraulic cam/lifters for the first time. Just had a few questions for those that have been around the shop a time or two.

Running Comp 1622-16.
When setting preload, comp directs to go to zero lash with no verticle movement in the push rod, then give one full turn on the adjuster. Now when I snug down the lock nut, I can tell that draws some preload out. Not much, but it's there. I just wanted to verify that I'm supposed to hold the adjuster solid as I tighten the lock nut. Also when I initially loosened the lock nuts, there was a clear snap like the PO had used loctite. Should I put loctite on these? And does anyone know the tq spec for the lock nut?
Thanks in advance gents, hope y'all hoons are enjoying the weekend!

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Hold the adjuster as you tighten the lock nut.
I've never used locktite but I've read that others have. I just make sure they are tighten snug with 16 ft/lbs of torque. Can you see locktite residue on the lock nut if you take one or two off?
I tighten the lock nut very tightly while holding the adjuster with a allen wrench and using a open end wrench on the lock nut. Then tighten the lock nut to 16 ft/lbs with a socket and torque wrench. The adjuster shouldn't move that much if you tighten pretty tightly with the open end wrench. I just chose 16 ft/lbs because it was close what I was tighten them by hand. The lock nut wouldn't move but just a tad bit more so I decided that was a good torque spec. Don't know if that is correct torque but it works for me. Never had one back off.
 
No loc-tite
Hand snug tighten.
So your best to keep the adjuster from moving. Take note to where and how it sits/positioned when you reach the point of where you want it set when tightened. As you tighten it up, the adjusted may rotate. Try and figure in how much it will rotate as you reach the final moment when it is tightened up enough for you.

This may not occur on all of the adjusters. Once tightened to spec in the place you want them, they will be fine.
 

I would imagine that there is no more than a few thousandths of preload taken out as you tighten the locks. You would be losing a few thousandths out of approximately .040". The whole process of setting preload is not all that accurate and does not have to be, and I would not think twice about that part.
 
I figured I was over thinking it, but when it comes to the internet, it always seems so easy, but never is!
Thanks for the advice!
 
adjustment advice is all over the place.Some suggest 1/4 to 3/4 for .045 and as nm9 says it's not that critical.The internet also says tighten until you feel no clearance.
I've never been able to feel it myself and never found it easy but still i have adjusted a few with no problems.
 
They are nice and quiet now, with nice crisp throttle response. Next question is, how often should they be checked?
 
JoeSBP said:
They are nice and quiet now, with nice crisp throttle response. Next question is, how often should they be checked?
Click to expand...
That's the $64,000 question. It depends on how much you run it and how hard. On brand new rockers I'd check them every time I had my car out - sometimes every run. But that was for a pure racer. Best thing to do is to keep it easy to pull the covers off and check them as a routine at the same time you're checking other stuff.
 
Back in the day.... it was common to take your car to the dealer for a spring and a fall tune-up.... if that is any help! I'd pull the shafts and examine everything between 500 and 1000 miles for cruising, or after the first few hard runs if racing.
 
Running a Comp 20-814-9, so they shouldn't be too stressed..
 
Ha ha, I was just being sarcastic. Just ordered some moroso gaskets, so will be checking regularly
 
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