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Old 01-02-2010, 08:57 AM   #1 (permalink)
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Hydraulic lifter pre-load??

Ok... I keep hearing about people adjusting their lifter pre-load to between 3-turns & 3.5-turns. Is this something that has collectively been determined to equal an approximate measurement? Like each turn equals .010" or something? Are all pushrods machined with the same thread pitch? Lastly, wouldn't different lifters require a different pre-load?

IE., With my Buick engines running a retro-Chevy SB roller lifter, I set the pre-load @ .025-.030 with the standard lifter and @ .005 with the race lifters...


Thanks,

K.
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Old 01-02-2010, 10:51 AM   #2 (permalink)
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All pushrods are NOT machined with the same thread pitch. The amount of preload is the amount of travel needed to center the plunger in the lifter. Most all hydraulic lifters have the same amount of plunger travel.
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Old 01-02-2010, 01:56 PM   #3 (permalink)
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Most lifters operate at 1/2-5/8 compressed of their total travel . You can use the pushrods manufacturers suggestion for turns if you have them or make note of how many turns it takes to bottom the lifter and back off half that amount to put you in the middle of the travel. If you really need to know how much one turn makes, you could use a long vernier or set up a dial indicator to find out, if there's no directions, or you bought a used set. Hydraulics aren't super critical of exact settings as long as you are in the compressed range that keeps them there between a cold and hot engine.
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Old 01-02-2010, 02:03 PM   #4 (permalink)
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another easy way is to extend the pushrod while keeping the jamb nut in place and measure the distance between the jamb jut and the female threaded end of the pushrod with a feeler guage, since the harley lifter has approximately 200 thousands of travel you should shoot for that middle mark or sligtly more. I have heard many cases where builders have said that setting preload further (deeper)reduced valvetrain noise but that has not been my experience at all, the S&S method is to bottom out the lifter and let it bleed off then come up a couple turns from bottom(depending on thread pitch)
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Old 01-02-2010, 07:23 PM   #5 (permalink)
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.140-.150" into the lifter and run it.
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Old 01-03-2010, 10:52 AM   #6 (permalink)
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Another way if you know the thread pitch is to do the math to figure out how many thousandths are in one revolution.
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Old 01-03-2010, 09:58 PM   #7 (permalink)
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To adjust pushrods that you may no longer have the instruction sheets for or may have come in a bike when purchased

http://www.bigboyzcycles.com/showthread.php?t=131
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Old 01-03-2010, 10:01 PM   #8 (permalink)
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The lifter has a reservoir of oil under the piston in the lifter body that it drinks from as the engine grows ....
http://www.v-twinforum.com/forums/tw...c-lifters.html
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Old 01-04-2010, 07:48 AM   #9 (permalink)
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Quote:
Originally Posted by stthomas View Post
To adjust pushrods that you may no longer have the instruction sheets for or may have come in a bike when purchased

http://www.bigboyzcycles.com/showthread.php?t=131
You realize that the link uses the TDCC method of adjustment. That will almost cause fist fights on this forum.
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Old 01-04-2010, 08:56 AM   #10 (permalink)
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Quote:
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You realize that the link uses the TDCC method of adjustment. That will almost cause fist fights on this forum.
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.............or cage fighting................
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Old 01-04-2010, 09:54 AM   #11 (permalink)
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HDMD88 is reading this now saying WTF is this? HDMD88 is reading this now saying WTF is this?
Quote:
Originally Posted by rbabos View Post
You realize that the link uses the TDCC method of adjustment. That will almost cause fist fights on this forum.
Ron
Watch it Ron

Here is a good picture of a lifter cross section.....yes they let me play with Crayons in Group
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Last edited by HDMD88; 01-04-2010 at 09:57 AM.
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Old 01-04-2010, 01:34 PM   #12 (permalink)
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Nice pic Doc!

And Merry Christmas/Happy New Year to you and Elizabeth!

K, this may help you on the TPI figuring..

Revolution Performance Chromoly – 32 tpi
Jims Pro-Lite – 24 tpi
Slim Jims – 32 tpi
Andrews – 28 tpi
Andrews – 32 tpi
Crane New Time Savers – 28 tpi
Crane Old Time Savers – 24 tpi
Crane – 32 tpi
H-D – 32 tpi
S and S – 32 tpi
Screaming Eagle – 32 tpi
Rivera Taper Lite – 40 tpi
Rev Tech – 36 tpi

Copied this from a post by MXR515...

For depth, go by threads per inch which in the case of a pushrod with 32 tpi (S&S etc) the depth in one turn would equate to 1/32 = .03125" per 1 turn. You would need just under 4.5 turns to get to .140 on a 32tpi pushrod. Just verify your tpi on the screamin eagle pushrods

Turns=.140\.03125 = 4.48 Turns with a 32tpi pushrod
(For a 24tpi pushrod it would equate to 3.36 turns)

By Flats (with a nut with 6 sides): 32tpi*6 flats per nut = 192 wrench flats per inch
1"/192 = .005208 (rounded off)
.140/.005208 = 26.88 flats to get to a .140 depth.
26.8802 flats /6 flats per nut = 4.48 turns
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Old 01-04-2010, 03:51 PM   #13 (permalink)
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HDMD88 is reading this now saying WTF is this? HDMD88 is reading this now saying WTF is this?
Happy New Year to you too Dan......keep up the good work.
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Old 01-04-2010, 04:00 PM   #14 (permalink)
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Have some Morels I wanted to try but they have a bigger roller
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Old 01-04-2010, 06:25 PM   #15 (permalink)
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Quote:
Originally Posted by HDMD88 View Post
Watch it Ron

Here is a good picture of a lifter cross section.....yes they let me play with Crayons in Group
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