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Adjustable rockers with hydraulic lifters

Richard Cranium

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Once there is zero play, how much should the adjusters be turned in?
 
We were told to tighten to zero, then tighten till push rod won't turn and then back off a hair to allow to turn.
 
-0- lash, plus 1-3/4 turns.

Follow your lash setting chart from Ma Mopar (if you have one) for which valves to do when, just like you are doing a mech cam.
 
For a semi performance engine, .040" preload seems about right. On a 3/8" X 24 T.P.I adjuster that equals one turn after zero.
 
RC I was told once upon a time by IQ to check the manufacturer's spec first because the preload recommendation can vary a bit depending on what type of lifters you have. What you don't want is to end up with 3 or sometimes even 2 adjuster threads showing under the rocker...if it takes that much to get your preload, longer pushrods are in order..
 
For a semi performance engine, .040" preload seems about right. On a 3/8" X 24 T.P.I adjuster that equals one turn after zero.

My information is directly from Mopar Engine Bible. However, your spot on about the .040" being happily in the mid stroke of the lifter, if its travel is .060" So, I absolutely agree. In order to be 100%, I would advise a dial indicator on the first screw to determine 1-turn equals ~.040". But to re-iterate, although Mopar says 1-1/2 to 2 turns, that does sound like maybe a little too far (deep) doesn't it?? It would be best though, if RC knew for sure the lifters travel is .060" in total to put him there, as lifters do vary. HTH, Lefty71
 
Wow, answers are all over the place. I'd always heard a 1/2 turn in.....what I heard anyway & what I've got my motor set at right now
 
As had been said elsewhere, it is lifter AND rocker arm maker dependent. I'm using the high performance Comp Cam lifters, they call for almost no preload, .001-.003 preload. My rocker arms call for 1 1/2 turns showing. The pushrod length is chosen to meet these two requirements.The preload seems low to me, but I've checked several times and confirmed.
Tim
 
Used to do Chebby’s a 360* more, always worked for me, YMMV.
 
Turn till it stops ticking !! :poke:or starts missing !:lol:
 
My lifters are supposed to get .030 to .060 preload. I set my new mancini roller rockers today at .040 which is 1 turn of the screw after I couldn't move the rods up and down any more. Fired up and ran great this afternoon.
 
Wow, answers are all over the place. I'd always heard a 1/2 turn in.....what I heard anyway & what I've got my motor set at right now

My machine shop has always told me to not prime the lifters, assemble the engine and adjust for zero lash + 1.5 turns. I do this and crank the engine and break in the cam. After break in, I like to run the valves on the loose side, so with engine running I loosen each valve until it starts to tap, then adjust until quiet + 1/2 turn. I haven't had any problems doing this. It's just a mess to clean after adjusting while running.
 
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