Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297118
05/01/17 01:44 PM
05/01/17 01:44 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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confirm that you are on base circle. You might need to open the lifters and clean & reassemble but wait for further input. if you do be careful not to bend the snap ring & always keep each lifters' innards together with the lifter body they came out of.
live every 24 hour block of time like it's your last day on earth
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Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297119
05/01/17 01:45 PM
05/01/17 01:45 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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If your saying your using the up and down method make sure you know exactly where zero lash is and then don't worry about the amount of preload resistance I like to use 1/4 to 1/3 turn preload on 3/8x24 adjusters (24 threads per inch equal .0416 per one full thread so 1/4 turn equal .0104, half turn =.0206 and so on) Not all hydraulic lifters like or need the same preload Play with the amount preload on yours to find what you and your motor like
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 1/2 turn hidraulic lifter preload
[Re: Cab_Burge]
#2297131
05/01/17 01:55 PM
05/01/17 01:55 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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I would think that lifters of the same brand/type would be close on how they act, that one or two of em would not be way off from the others, that is why I am thinking that one might have an issue, poor tolerances (assy line mistakes happen) or a bit of debris. Just sayin (might be a non issue) but I would want to know for sure.
live every 24 hour block of time like it's your last day on earth
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Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297305
05/01/17 06:23 PM
05/01/17 06:23 PM
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Joined: Oct 2005
Posts: 8,906 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,906
Ontario, Canada
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In fact there is not preload because they are solids. Solid lifters DO NOT get preload, they get LASH. The easiest way is put the appropriate feeler gauge between the valve stem and rocker tip and spin the pushrod as you tighten the adjuster screw. When the pushrod won't spin you're done. Tighten the nut. If you put preload on a solid lifter the valves will never seat and the engine will run like CRAP - if it runs at all !!
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Re: 1/2 turn hidraulic lifter preload
[Re: Stanton]
#2297322
05/01/17 07:00 PM
05/01/17 07:00 PM
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Joined: Jul 2011
Posts: 960 Chicago
PurpleBeeper
super stock
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super stock
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Chicago
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In fact there is not preload because they are solids. Solid lifters DO NOT get preload, they get LASH. The easiest way is put the appropriate feeler gauge between the valve stem and rocker tip and spin the pushrod as you tighten the adjuster screw. When the pushrod won't spin you're done. Tighten the nut. If you put preload on a solid lifter the valves will never seat and the engine will run like CRAP - if it runs at all !! Listen to Stanton on this one..... You need lash, not pre-load with solid lifters
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
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Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297332
05/01/17 07:27 PM
05/01/17 07:27 PM
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Joined: Nov 2004
Posts: 340 Vitoria, Spain
Coke
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OP
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Posts: 340
Vitoria, Spain
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What i did mean is that they are stuck.The plunger does not move. I mention that it is an hydraulic cam in the title and the first post. Regards
Last edited by Coke; 05/01/17 07:40 PM.
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Re: 1/2 turn hidraulic lifter preload
[Re: Stanton]
#2297406
05/01/17 09:35 PM
05/01/17 09:35 PM
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Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
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master
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Prospect, PA
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I still suggest spinning the pushrod to find zero as in my previous post. You spin the pushrod as you tighten the adjuster screw. When you can't spin the pushrod then you are at zero preload. Now turn the adjuster screw the recommended amount and tighten the nut. Done ... move on to the next.
The problem is with today's hydraulic lifters there is no load with a bleed down lifter and you might not feel any resistance with the spin test. You need to watch the plunger for fist signs of movement to first find zero preload. I've seen guy do the spin test and run the lifter to fully collapsed and not know it.
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Re: 1/2 turn hidraulic lifter preload
[Re: BSB67]
#2297429
05/01/17 10:04 PM
05/01/17 10:04 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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I like to wiggle the pushrod up and down to get to zero clearance. On preoiling go to #8 on TDC & preoil then go forward 3/4 of a turn to #6 with the dampener slit on zero (TDC) & preoil again (Big block) then you can back up to 15 BTDC to set the dist. on a SB go to 90 BTDC #1 compression (might be partial slits on dampener every quarter turn for this) & preoil then go to 20 ATDC #6 compression (use the tab as a ruler) & preoil again then back up the dampener to 15 BTDC & set dist magnet dead even with the tooth with the rotor under #6 plug wire.
live every 24 hour block of time like it's your last day on earth
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Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297454
05/01/17 10:41 PM
05/01/17 10:41 PM
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Joined: Oct 2005
Posts: 8,906 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,906
Ontario, Canada
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I have been Re-doing the lifters preload and after researching the zero lash, i have found a couple of lifters which show resistance when i going to add the 1/2 turn preload. On the others,the adjusting screw turns very loose when i,m adding the preload. 1) back off all adjusters 2) prelube engine by hand - rotate as mentioned 3) zero lash using up-down method 4) add 1/4 turn and tighten nut 5) once you have adjusted them all, look at the length of the adjusters - they should all be very close in length. If not - you have a problem !! If you can prelube the motor that's fine, you should still be able to feel "zero" with your up/down method - just use a gentle touch. It is very common to adjust lifters without removing the intake and valley tray. Also, and this may sound dumb BUT make sure the pushrod is in the lifter. What brand are the rockers?
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Re: 1/2 turn hidraulic lifter preload
[Re: sthemi]
#2297594
05/02/17 08:44 AM
05/02/17 08:44 AM
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Joined: Nov 2004
Posts: 340 Vitoria, Spain
Coke
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OP
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Posts: 340
Vitoria, Spain
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On adjustable hyd lifters, the way I was taught was to rotate the engine and do one cylinder at a time. I believe the proper sequence is to adjust the intake valve when the exhaust starts closing, and the exhaust when the intake begins to open. Each lifter may feel tighter or looser because of previous leak down from being compressed. What you are looking for is when the pushrod first meets resistance while tightening the adjuster, then it a half to 3/4 turn past that.. I keep turning the pushrod while making the adjustment to be certain when contact is first made. The Lunati cam sheet says adjust intake when exahust just starts to open and adjust exhaust when intake is fully open. For the zero lash i,m using the up and down method because i don,t have the touch of a trained engine builder and twisting the pushrod may result into a excesive lifter preload.
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Re: 1/2 turn hidraulic lifter preload
[Re: Coke]
#2297627
05/02/17 10:26 AM
05/02/17 10:26 AM
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Joined: Oct 2005
Posts: 8,906 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,906
Ontario, Canada
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Then should to prime the engine with all the rockers adjusters loosen all the way off? Sure. Rotate the crank as you prime (see RapidRobert post: On preoiling go to #8 on TDC & preoil then go forward 3/4 of a turn to #6 with the dampener slit on zero (TDC) & preoil again (Big block) . Also keep in mind that not all lifter oil holes will be exposed to the oil galley each rotation as there will be some at max lift. Therefore, you want to rotate the engine enough times to fill all lifters. I would rotate the crank 8 revolutions. This may be the reason you had some hard and some soft lifters - not all were filled. There are some comments here about lifter "bleed down". My opinion: once the system is primed the lifters should NOT bleed down BECAUSE there is no pressure on them until you adjust your preload. The only thing to cause a lifter to bleed down is the valve spring pressure. Is this a big block or small block ??
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