Originally Posted by
Walking-Tall
One more base to cover... and, no offense meant if you already know the procedure (lifters for the cylinder being checked/set being on the base circle, zero lift of the camshaft, and then adjusting rockers, and... procedure below) for checking/setting hydraulic lifter pre-load that's going to be pasted below that I've pasted into a few other threads, because I suspect that from your later words within this thread that the rockers may not be set properly...
This: "... Currently with the pushrod all the way down I can grab my thumb and slightly turn the roller.. and rock the rocker in its pivot perhaps this is the sound. That was with 1/2 turn preload..." shouldn't be possible with pre-load (the opposite of clearance (your ability to rock the rocker in it's pivot), like the clearance/lash that's set with a solid lifter camshaft) set right everywhere at all 16 rocker arms. FWIW, I've always adjusted for 1/4 turn hydraulic lifter pre-load, which has always done away with the possibility of lifter "pump up", eliminating the necessity of buying more expensive "anti-pump up" hydraulic lifters, and there was never any clatter or ticking and the engines would rev about as high as you cared to spin 'em.
Real good procedure for checking/setting hydraulic lifter pre-load, most especially when you have adjustable rocker arms:
Pull the valve covers and spark plugs, rotate the crankshaft to #1 TDC compression stroke (indicated by the balancer/pointer, and the distributor rotor pointing at #1 plug wire terminal), mark the balancer or crank pulley at TDC, put another mark 180-degrees from that, and marks halfway between both those at the 90-degree spots, so you've essentially (because your balancer's TDC mark won't be straight up) got marks at 12 (TDC), 3, 6, & 9 o'clock (the cylinders fire every 90-degrees), then while still at 12 o'clock, #1 TDC compression, check #1 cylinder's (front passenger side) rockers/valves for any slack between rocker and valve stem tip, and if none, just for good measure, or for when purposely setting all the pre-loads, loosen those two rocker nuts until there's some clearance at pushrod/rocker, grab each push rod with finger and thumb, and slowly tighten the rocker nut just until there's no up/down clearance, or slight drag to rotating the pushrod, and then tighten the nut the additional 1/4 or 1/2 turn for pre-load... then rotate the crankshaft clockwise 90-degrees to your 3 o'clock position and check the next cylinder in the firing order (the firing order of the camshaft, and therefore the ignition plug wire routing, is known and has been checked/verified, yes?)... continuing the same for each cylinder in the firing order, rotating the crankshaft 90-degrees between each cylinder checking/setting with your 12 & 3 & 6 & 9 o'clock marks, until all 8 cylinders have been checked/set.
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