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HYD lifter pre load?????
#1434100
05/10/13 06:40 PM
05/10/13 06:40 PM
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Joined: Aug 2011
Posts: 117
canada
jp15
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canada
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totally new to Me. Question ? can I adjust my adjustable rockers down to bottom out and back off say 60 thou. to achieve proper pre load?.( lobe on base ) ( HYD cam) tried the finger turning way,but rod up against rocker with adj. backed all way out and has slight resistance there ???. probably a thread here on this but I can't find it. any help appreciated. Thanks, Jim 
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Re: HYD lifter pre load?????
[Re: jp15]
#1434101
05/10/13 06:51 PM
05/10/13 06:51 PM
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Joined: May 2005
Posts: 6,446
NJ-USA
HPMike
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NJ-USA
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Quote:
totally new to Me. Question ? can I adjust my adjustable rockers down to bottom out and back off say 60 thou. to achieve proper pre load?.( lobe on base ) ( HYD cam) tried the finger turning way,but rod up against rocker with adj. backed all way out and has slight resistance there ???. probably a thread here on this but I can't find it.
any help appreciated.
Thanks, Jim
Not quite getting what you mean..??
I go 3/4 a turn after the adjuster seats in pushrod. You can go more(id say no more than 1.5 turns) or less(no less than 1/2 a turn. But I have been doing it this way(3/4) for years with no problem. it does take some touch..I do not use a tool to find the "seated" point, but use my fingers as it is really tricky to find the exact point that the "lash" is out.
Important to make sure that the rocker adjuster is in its proper "sweet spot" in the rocker after you are done. Depends on the mfg as they arent all the same. If you eff this up you will get rocker/adjuster failure or lack of oiling to the p/r.
Its not rocket science..
MB
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Re: HYD lifter pre load?????
[Re: jp15]
#1434105
05/10/13 07:14 PM
05/10/13 07:14 PM
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Joined: May 2005
Posts: 6,446
NJ-USA
HPMike
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Quote:
there ya go . lol, I have some brass shim stock I'll try that. Thanks
nooooooo..... 
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Re: HYD lifter pre load?????
[Re: HPMike]
#1434106
05/10/13 07:48 PM
05/10/13 07:48 PM
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Joined: Aug 2011
Posts: 117
canada
jp15
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Joined: Aug 2011
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canada
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Quote:
Quote:
there ya go . lol, I have some brass shim stock I'll try that. Thanks
nooooooo.....
lol, crap whachyou mean man.
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Re: HYD lifter pre load?????
[Re: jp15]
#1434107
05/10/13 08:00 PM
05/10/13 08:00 PM
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Joined: May 2005
Posts: 6,446
NJ-USA
HPMike
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Quote:
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there ya go . lol, I have some brass shim stock I'll try that. Thanks
nooooooo.....
lol, crap whachyou mean man.
Its just a personal thing with me..Why use shims when all you need is correct p/r's? Just doesnt make any sense. You could also cause geometry problems if everything is good now. Measure for length and get the right pushrods if the ones you have wont work. If you dont need anything exotic, and it sounds like you dont, then they arent all that expensive.
MB
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Re: HYD lifter pre load?????
[Re: jp15]
#1434109
05/11/13 12:33 AM
05/11/13 12:33 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
I hear ya , just don't understand why this won't work? the rods are shorter than the factory rods, if I used the factory stamped rockers I wouldn't have noticed this. It's only a .528 lift COMP cam.??? using the adj. rockers so the rod doesn't pierce the stamped rocker. 
What is so difficult about doing it the RIGHT way...
on the base of the cam... turn the adjuster in till
the push rod has drag or stops turning... then give
it 1/2 to 3/4 turn... done.. move to the next one..
if your off a 1/4 turn its not gonna kill you
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Re: HYD lifter pre load?????
[Re: MR_P_BODY]
#1434110
05/11/13 12:54 AM
05/11/13 12:54 AM
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Joined: Aug 2003
Posts: 43,207
Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,207
Bend,OR USA
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Quote:
Quote:
I hear ya , just don't understand why this won't work? the rods are shorter than the factory rods, if I used the factory stamped rockers I wouldn't have noticed this. It's only a .528 lift COMP cam.??? using the adj. rockers so the rod doesn't pierce the stamped rocker.
What is so difficult about doing it the RIGHT way...
on the base of the cam... turn the adjuster in till
the push rod has drag or stops turning... then give
it 1/2 to 3/4 turn... done.. move to the next one..
if your off a 1/4 turn its not gonna kill you
 If your using the solid lifter pushrods from the 273 on a stock type set of hydraulic lifters your fooling with fate, loof to have 1 to no more than 3 full threads of the adjuster exposed under the bottom of the rocker amr with .015 to .045 lifter preload, I like and use 1/4 to 1/3 of a turn after zeroing the liftere clearances out, zero preload plus 1/4 to 1/3 turn in for hydraulic lifter preload   
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: HYD lifter pre load?????
[Re: MR_P_BODY]
#1434111
05/11/13 06:56 AM
05/11/13 06:56 AM
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Joined: Aug 2011
Posts: 117
canada
jp15
OP
member
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OP
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Joined: Aug 2011
Posts: 117
canada
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Quote:
Quote:
I hear ya , just don't understand why this won't work? the rods are shorter than the factory rods, if I used the factory stamped rockers I wouldn't have noticed this. It's only a .528 lift COMP cam.??? using the adj. rockers so the rod doesn't pierce the stamped rocker.
What is so difficult about doing it the RIGHT way...
on the base of the cam... turn the adjuster in till
the push rod has drag or stops turning... then give
it 1/2 to 3/4 turn... done.. move to the next one..
if your off a 1/4 turn its not gonna kill you
Not a thing difficult about adj. valves, have done it a few times the last 26 years of racing solids. like I said in my post it has no clearance with the adj backed right out of the rocker???? haven't done this with adj rockers on hyd cam. what do you call resistance to turning. (slightly, hard to turn, or till it stops turning then a extra turn 1/4 er whatever..
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Re: HYD lifter pre load?????
[Re: MR_P_BODY]
#1434113
05/11/13 08:58 AM
05/11/13 08:58 AM
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Joined: Aug 2011
Posts: 117
canada
jp15
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Posts: 117
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Quote:
Not a thing difficult about adj. valves, have done it a few times the last 26 years of racing solids. like I said in my post it has no clearance with the adj backed right out of the rocker???? haven't done this with adj rockers on hyd cam. what do you call resistance to turning. (slightly, hard to turn, or till it stops turning then a extra turn 1/4 er whatever..
Till you get all the free play out of it
I have no free play, clearance etc
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Re: HYD lifter pre load?????
[Re: jp15]
#1434116
05/11/13 09:34 AM
05/11/13 09:34 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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Quote:
as I posted, have the adj. out of rocker and rod is against rocker. NO clearance???. rod is a mopar mech cup and socket type rod and is a bit shorter than a stock hyd. rod. cam base should be smaller than a stock cam so I don't know why I have no free play
Sounds like your push rods are too long
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Re: HYD lifter pre load?????
[Re: jp15]
#1434117
05/11/13 10:01 AM
05/11/13 10:01 AM
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Joined: Jan 2003
Posts: 75,037
U.S.S.A.
JohnRR
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Quote:
as I posted, have the adj. out of rocker and rod is against rocker. NO clearance???. rod is a mopar mech cup and socket type rod and is a bit shorter than a stock hyd. rod. cam base should be smaller than a stock cam so I don't know why I have no free play
Your pushrods are TOO LONG , you need to get or make a checker pushrod and figure out the length you need and have a set made.
The purpose of rockers shims is to correct incorrect rocker to valve geometry , they are NOT for correcting for pushrods that are too long , I don't care who say they are, they are WRONG.
If your pushrods are against the rockers without the adjusters then you need new pushrods , plain and simple.
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Re: HYD lifter pre load?????
[Re: JohnRR]
#1434118
05/11/13 10:34 AM
05/11/13 10:34 AM
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Joined: Aug 2003
Posts: 43,207
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,207
Bend,OR USA
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Quote:
Quote:
as I posted, have the adj. out of rocker and rod is against rocker. NO clearance???. rod is a mopar mech cup and socket type rod and is a bit shorter than a stock hyd. rod. cam base should be smaller than a stock cam so I don't know why I have no free play
Your pushrods are TOO LONG , you need to get or make a checker pushrod and figure out the length you need and have a set made.
The purpose of rockers shims is to correct incorrect rocker to valve geometry , they are NOT for correcting for pushrods that are too long , I don't care who say they are, they are WRONG.
If your pushrods are against the rockers without the adjusters then you need new pushrods , plain and simple.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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