Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Tightening Rocker arm nuts with hydraulic lifters?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BayouBlazer88, Aug 13, 2003.

  1. BayouBlazer88

    BayouBlazer88 1/2 ton status

    Joined:
    Jul 31, 2002
    Posts:
    353
    Likes Received:
    0
    Location:
    Lafayette, LA
    I have a brand new set of lifters, pushrods, and roller rockers that I'm installing on my freshly rebuilt 88' 350tbi (which also has a new cam). I know that to tighten the rocker arms nuts, you spin the pushrod while you tighten the nut and as soon as you can't spin the pushrod, you tighten the nut 1/2-3/4 turn. Now is there any further adjustment needed since I have hydraulic lifters or is that it? Also, is there any special procedure I need to use since I have aftermarket roller rockers and not stock stamped rockers? Thanks.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    191
    Location:
    Roy WA
    It's not until you can't spin the pushrod, it's only until you start to feel DRAG on the pushrod as you spin it. It is a VERY "precise" measurement, as it takes almost no nut movement to go from no drag, to a fairamount of drag.


    Make sure on the rockers that the roller tip is not "over center" with the valve closed. You want the roller tip to be slightly "inboard" of the center of the valve stem with the valve closed, as it will roll "forward" as the valve is depressed...if it rolls too close to the edge of the valve stem, you can end up with problems.

    That adjustment is governed with pushrod length. I believe most roller rockers are designed to use standard length pushrods, but make sure and double check the pushrods are the right length.
     
  3. BayouBlazer88

    BayouBlazer88 1/2 ton status

    Joined:
    Jul 31, 2002
    Posts:
    353
    Likes Received:
    0
    Location:
    Lafayette, LA
    [ QUOTE ]
    It's not until you can't spin the pushrod, it's only until you start to feel DRAG on the pushrod as you spin it. It is a VERY "precise" measurement, as it takes almost no nut movement to go from no drag, to a fairamount of drag.

    [/ QUOTE ]

    -Yeah thats what I meant. And I didn't know that about the roller tip being slightly inward. I'll see what I can do about that. And yes I'm using standard length pushrods. Thanks.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,063
    Likes Received:
    70
    Location:
    Pleasanton, CA.
    Don't forget that with new lifters unless you soak them in oil and make sure they get pumped up you can easily overtighten the rocker nuts causing catastrophic failure.
     
  5. fortcollinsram

    fortcollinsram 1/2 ton status

    Joined:
    Nov 8, 2001
    Posts:
    2,261
    Likes Received:
    0
    Location:
    Fort Collins, CO
    Pretty much what Dorian Said...

    I #1 and work through each valve making sure that the lifter is on the base circle of the cam of the valve I am adjusting...Once the lifter is on the base circle, make sure the rocker nut is loose...so you can freely move the pushrod up and down..Then slowly tighten the rocker nut while you spin the pushrod...As soon as you start to feel ANY drag on the pushrod, stop and verify the point that the drag starts...This is zero lash..then turn the rocker nut 1/2 to 3/4 of a turn....The ideas is to get the plunger in the lifter about 1/4 to 1/2 way compressed in its travel...you can verify that it isn't oo tiget by seeing pusing the push rod into the lifter a bit and it should compress the plunger the rest of the way...I think it is easer with a dry lifter rather than soaking them in oil...
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    Don't forget that with new lifters unless you soak them in oil and make sure they get pumped up you can easily overtighten the rocker nuts causing catastrophic failure.

    [/ QUOTE ]

    That's total bullshit. Read your cam maufacturers installation instructions.
     
  7. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

    Joined:
    Mar 5, 2001
    Posts:
    15,684
    Likes Received:
    1,392
    Location:
    642 Days to BB2018
    [ QUOTE ]
    Don't forget that with new lifters unless you soak them in oil and make sure they get pumped up you can easily overtighten the rocker nuts causing catastrophic failure.

    [/ QUOTE ]


    [ QUOTE ]
    That's total bullshit. Read your cam maufacturers installation instructions.

    [/ QUOTE ]





    [grabs popcorn...]

    This oughta be good..... someone telling Scott he doesn't know anything about engine building. /forums/images/graemlins/grin.gif
     
  8. 4DiggerDan

    4DiggerDan 1/2 ton status

    Joined:
    Feb 2, 2003
    Posts:
    103
    Likes Received:
    0
    Location:
    Montucky, USA
    Oh, us engine machinists love hearing people tell us we're stupid /forums/images/graemlins/laugh.gif

    Once zero lash is obtained I usually go 3/4 turn. If you want lots of action on the valve, then you should be running a solid cam /forums/images/graemlins/laugh.gif

    On a race engine where hydraulic cams are all you're allowed to run then I do it the old school way, with the engine running and up to temp, I start loosining each rocker arm until it clatters and then obtain zero lash (it quits clattering) and then go like 1/16th of a turn more. That might make 1 or two horse more than the zero lash +3/4 turn....
     
  9. RustBuket

    RustBuket 1/2 ton status

    Joined:
    Feb 21, 2003
    Posts:
    1,618
    Likes Received:
    0
    Location:
    Saskatchewan, Canada
    This I guy I know showed me how to do it with the engine running. Its quite cool actually! Makes a mess tho!
     
  10. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,063
    Likes Received:
    70
    Location:
    Pleasanton, CA.
    Well Greg, it doesn't surprise me to see 84 chevy K10 make a comment like that since I seen him start (jeep) in another post recently. /forums/images/graemlins/ignore.gif
     
  11. BayouBlazer88

    BayouBlazer88 1/2 ton status

    Joined:
    Jul 31, 2002
    Posts:
    353
    Likes Received:
    0
    Location:
    Lafayette, LA
    [ QUOTE ]
    Once zero lash is obtained I usually go 3/4 turn.

    [/ QUOTE ]

    -I did exactly that. I didn't let the new lifters soak in oil before I installed them though. They are Speed Pro lifters. I hope I'll be ok. One thing I noticed when I was tightening the rockers is that it was hard to turn the first 1/4 to 1/2 turn then it got really easy until the full 3/4 turn. I guess that means the lifter was being compressed. I'm hoping this will suffice. We'll see what happens tomorrow when I start her up.
     
  12. Beast388

    Beast388 1/2 ton status

    Joined:
    Nov 6, 2001
    Posts:
    3,039
    Likes Received:
    0
    Location:
    Clinton, IA USA
    [ QUOTE ]
    Well Greg, it doesn't surprise me to see 84 chevy K10 make a comment like that since I seen him start (jeep) in another post recently. /forums/images/graemlins/ignore.gif

    [/ QUOTE ]

    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
    Are you speaking of this post?

    Some people will never learn. /forums/images/graemlins/rolleyes.gif /forums/images/graemlins/eek.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     
  13. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,063
    Likes Received:
    70
    Location:
    Pleasanton, CA.
  14. MA87K5

    MA87K5 1/2 ton status

    Joined:
    Apr 6, 2000
    Posts:
    558
    Likes Received:
    0
    Location:
    Chicopee, Ma 01020
    I might not have as much experiance as most of everyone here but I never heard of soaking the lifters. The 3 engines that I have put cams and lifters I only used assembly lube. No problems what so ever. I think as long as your oil pump works then you won't have a problem. I have worked with peolpe who have built engines for a living and they don't soak the lifters. So it must be personnal opinion. There is nothing wrong with soaking the lifters first, but will the assembly lube stick to them?
     
  15. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,063
    Likes Received:
    70
    Location:
    Pleasanton, CA.
    I better make this a little more clear. The person asking about this doesn't seem to have very much experience in adjusting lifters (NOTHING WRONG WITH THAT). I however do not soak the lifters when I adjust them, but a person who does not have as much experience doing it may easily overtighten the rocker nuts to the point that the lifter plunger bottoms out and then when the extra 1/2 to 3/4 turn is given the valves will hit the pistons. If the intake manifold is still off when the new lifters are being adjusted that will make it much easier to adjust without problems as you are able to see when the plunger of the lifter starts to move along with the fact that you have slight drag on the push rod meaning zero lash.
     
  16. MA87K5

    MA87K5 1/2 ton status

    Joined:
    Apr 6, 2000
    Posts:
    558
    Likes Received:
    0
    Location:
    Chicopee, Ma 01020
    I understand that. The lifters aren't that easy to squash. As long as you pay attention to what you are doing then you won't have a problem. Mechanically inclined is the key. But better be safe then sorry.
     
  17. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    If the intake manifold is still off when the new lifters are being adjusted that will make it much easier to adjust without problems as you are able to see when the plunger of the lifter starts to move along with the fact that you have slight drag on the push rod meaning zero lash.

    [/ QUOTE ]

    I couldn't agree more there. I try to do it with the intake off too...much safer that way for me. I have done it with the intake on, I just prefer it with the intake off so I can see the lifters.

    As to whoever's knowledge of cam installation, if you think you know more than the instructions, go for it, do it your way. Just don't tell others to do it that way. I have always installed cams as per instructions and I have NEVER had an issue with a cam I've installed.

    I didn't click the link above, but if anyone is referring to the used engine I had a couple months ago, when I get time to tear it down, I will tell everyone what was wrong with it. I feel that there was an issue with that engine long before I touched it.

    The following week I installed a Summit cam in my buddy's K10 with no problems what so ever. Breakin went perfect, no issues with that and he's perfectly happy with the results, as am I.

    I am no expert but I have installed a number of camshafts.
     
  18. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    I think it is easer with a dry lifter rather than soaking them in oil...

    [/ QUOTE ]

    Grab your popcorn. Looks like one person already agrees with me.
     
  19. fortcollinsram

    fortcollinsram 1/2 ton status

    Joined:
    Nov 8, 2001
    Posts:
    2,261
    Likes Received:
    0
    Location:
    Fort Collins, CO
    I just think it is easier to find zero lash with dry lifters... I have taught myself to feel for the drag as you turn the push rod while running the rocker nuts.Thats just me though...It worked great on my 454...I ran the pass side valves and they were dead nutz...I think I do have a drivers side exh. valve to tight though that I will fix before too long...

    Chris
     
  20. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    I agree. I simply prefer to do it the way the instructions say.
     

Share This Page