I need help with adjustable pushrods
My question is:
I adjusted the pushrods per the instructions but I am not sure I got them adjusted right and I want to re-adjust them and I am wanting to know the proper procedure to adjust the rods after they have been installed.

BTW Make sure that all of your O-rings are in place, and your pushrod covers are seated correctly. You will also save some heartache by holding your PR covers up while turning with rubber bands.
Arent you glad I didnt just say DO A SEARCH?
Last edited by deezee; Feb 13, 2010 at 05:15 PM.
My question is:
I adjusted the pushrods per the instructions but I am not sure I got them adjusted right and I want to re-adjust them and I am wanting to know the proper procedure to adjust the rods after they have been installed.
There are at least three methods for adjusting hydraulic lifters. These methods are very similar to those used to adjust automotive hydraulic lifters.
CAUTION: DO NOT ROTATE THE ENGINE IF A LIFTER IS ON THE HEEL OF THE CAM AND THE PUSH ROD CANNOT BE ROTATED!
The first method, while the least accurate, is the quickest and easiest. Start by adjusting the push rods to their shortest length and installing each into its proper valve position according to its length. Adjust each push rod until all free play is removed while the lifter is on the heel of the cam. Next, lengthen the push rod by turning the adjusting screw 4 to 5 turns (24 to 30 flats) and tighten the lock nut. Wait a couple of minutes to make sure the lifter has bled-down. Repeat for each push rod.
From a performance standpoint, the second method is more accurate than the first, but it takes longer to do. For accuracy the valve must be fully closed and its lifter positioned on the heel of the cam. Start by removing the spark plugs and rotating the engine forward until a push rod is at its highest position. Then adjust the same push rod for the other cylinder. (If the rear intake push rod is at its highest, you adjust the front intake push rod) Use the adjustment screw to lengthen the push rod until there is sufficient pressure so the push rod cannot be turned with the thumb and index finger. Wait at least two minutes for the lifter to bleed down, then lengthen the push rod again until it will not turn. Again, let the lifter bleed down. Keep repeating the tightening, bleed down procedure until the lifter will not bleed down anymore, but is not tight enough to open the valve. The lifter is now bottomed out. Now shorten the push rod by reversing the adjustment screw one half (1/2) to one (1) turn (3 to 6 flats). Tighten the lock nut. When finished you should be able to spin the push rod easily with your fingers. If it does not spin free, the lifter has too much preload and you must repeat the adjustment.
Rotate the engine so the lifter that was just adjusted is at its highest position. Adjust the same lifter on the opposite cylinder. Repeat the procedure for all four lifters. When all the lifters are adjusted, turn the engine a few additional revolutions by hand and check each lifter again. First make sure the lifter is on the heel of the cam and its valve is fully closed, and then check that the push rod will spin free. If any lifter is adjusted too tight you risk burning a valve because the valve will not completely close.
The third, and most accurate, method requires access to the valve spring top collar and a dial indicator. Its long and involved so if you need those directions either email me or find a copy of The Big Twin HighPerformance Guide by the late D. William Denish.
There are at least three methods for adjusting hydraulic lifters. These methods are very similar to those used to adjust automotive hydraulic lifters.
CAUTION: DO NOT ROTATE THE ENGINE IF A LIFTER IS ON THE HEEL OF THE CAM AND THE PUSH ROD CANNOT BE ROTATED!
The first method, while the least accurate, is the quickest and easiest. Start by adjusting the push rods to their shortest length and installing each into its proper valve position according to its length. Adjust each push rod until all free play is removed while the lifter is on the heel of the cam. Next, lengthen the push rod by turning the adjusting screw 4 to 5 turns (24 to 30 flats) and tighten the lock nut. Wait a couple of minutes to make sure the lifter has bled-down. Repeat for each push rod.
From a performance standpoint, the second method is more accurate than the first, but it takes longer to do. For accuracy the valve must be fully closed and its lifter positioned on the heel of the cam. Start by removing the spark plugs and rotating the engine forward until a push rod is at its highest position. Then adjust the same push rod for the other cylinder. (If the rear intake push rod is at its highest, you adjust the front intake push rod) Use the adjustment screw to lengthen the push rod until there is sufficient pressure so the push rod cannot be turned with the thumb and index finger. Wait at least two minutes for the lifter to bleed down, then lengthen the push rod again until it will not turn. Again, let the lifter bleed down. Keep repeating the tightening, bleed down procedure until the lifter will not bleed down anymore, but is not tight enough to open the valve. The lifter is now bottomed out. Now shorten the push rod by reversing the adjustment screw one half (1/2) to one (1) turn (3 to 6 flats). Tighten the lock nut. When finished you should be able to spin the push rod easily with your fingers. If it does not spin free, the lifter has too much preload and you must repeat the adjustment.
Rotate the engine so the lifter that was just adjusted is at its highest position. Adjust the same lifter on the opposite cylinder. Repeat the procedure for all four lifters. When all the lifters are adjusted, turn the engine a few additional revolutions by hand and check each lifter again. First make sure the lifter is on the heel of the cam and its valve is fully closed, and then check that the push rod will spin free. If any lifter is adjusted too tight you risk burning a valve because the valve will not completely close.
The third, and most accurate, method requires access to the valve spring top collar and a dial indicator. Its long and involved so if you need those directions either email me or find a copy of The Big Twin HighPerformance Guide by the late D. William Denish.
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As honestbob stated, different brands have different number of threads per inch which require a different number of turns to arrive at the correct position.






