Pre load on hyd lifters

[Garys1969RR]

I am going from factory rockers to Crane Gold Adj rockers with my 509 hyd cam. I need to know the best method for setting pre load on the lifters. My idea is to first prime the oil system to pump up all the lifters to max height, with the rocker arms off. Then install the push rods/rocker arms with the adjusters backed off a bit. Then set #1 cyl at TDC firing stroke. Then adjust that #1 pair by closing the adjuster till it is at zero lash, then tighten 1/8 turn to set the pre load. Does sound like the best way to do it? Any ideas appreciated. Thanks.

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451 engine, 400 block. Eddy Perf RPM heads

 

[62MAX]

You won't pump up the lifters with the rocker arms off !

 

[69Bee]

Don't pump up the lifters. Adjust rocker to zero lash, and then desired pre-load. When the exhaust lifter starts to move up, adjust the intake, and when the intake lifter is almost all of the way down, adjust the exhaust.

Or....

Set #1 at TDC, and adjust #2 intake #8 exhaust
Rotate 90 degrees, and adjust #1 intake #4 exhaust
Rotate 90 degrees, and adjust #8 intake #3 exhaust
Rotate 90 degrees, and adjust #4 intake #6 exhaust
Rotate 90 degrees, and adjust #3 intake #5 exhaust
Rotate 90 degrees, and adjust #6 intake #7 exhaust
Rotate 90 degrees, and adjust #5 intake #2 exhaust
Rotate 90 degrees, and adjust #7 intake #1 exhaust

 

[Meep-Meep]

I use the DC valve adjustment procedure (as above) and set one full turn in from zero lash. Never had an issue.

 

[IQ52]

Preload depends entirely upon the lifter design. For instance, Crane hydraulic roller lifters use 1 to 1-1/2 turns and Comp ProMagnum hydraulic roller lifters use 0 to 1/8 turn. Check with the manufacture before setting the preload.

With aluminum heads the pre-load/lash will loosen approximately .006" when the engine warms up.

 

[Budnicks]

:iamwithstupid: also make sure the rocker adjuster bolt ball end on them Crane Super Golds, isn't sticking out more than 3 threads visible on the under side "absolutely max" {less is better In my experience anyway} or you will have oil starvation to the tips of the cupped pushrods & ball on the adjuster bolt, pre-mature wear or failure... if you don't get the proper amount of preload within that area on the adjusters, you can shim the shafts &/or shorten or lengthen the push-rods if needed, especially if you need longer push rods to be within recommended spec.'s, because of a smaller base circle camshaft {if you have one}... It's a good practice to check every-time either way... good luck

 

[Garys1969RR]

I am using the lifters that came with this MP Purple shaft cam. It has .509 lift, 292 duration. 242 duration @ .050".

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I had shimmed the rocker arm shaft .040" , with the stock valve train to get the lifter plunger near the top of its travel. Worked great!

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Guess I will start with 1/8 turn in from zero lash. If its noisy, then will go to 1/2 turn in. I think its better to run the plunger near the top of its travel, then if it pumps up at higher RPMs, it wont have far to go. Lol