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  •  » Something to know before valve leash

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    2/26/2022 3:43 AM  #1

    Alessandro
    I FYI 24-7

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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Something to know before valve leash

    Hello , 
    After rebuild my engine with a complete job , now after 5000 /7000 miles i have in mind to check my valve leash . 
    I never did this job and i would like to know what " do & don't " about it . Which is the correct step after step ?
    Any particular attention i should look at ?
    Which is the correct gap to leave ? Stock heads 289
    Thanks ! 

     

    2/26/2022 6:16 AM  #2

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,497

    Re: Something to know before valve leash

    I'm assuming you have a hydraulic cam.  There is no lash or clearance with a hydraulic cam.  Hydraulic lifters need preload, not lash.  With the engine warm you check each lifter preload by backing off the adjusting nut to where the pushrod has some slack (I check this by moving it up and down as I find this more accurate, others will say spin the pushrod in your fingers).  Tighten the adjusting nut to where there is no longer any slack, and then go 1/2 turn tighter.  You adjust the intake valve as the exhaust valve is opening and vice versa.  Then move on to the next cylinder. 
     

     

    2/26/2022 10:05 AM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,253

    Re: Something to know before valve leash

    If they were set when the engine was assembled, no need to mess with it ever again, most likely.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/26/2022 11:53 AM  #4

    Alessandro
    I FYI 24-7

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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: Something to know before valve leash

    TKOPerformance wrote:

    I'm assuming you have a hydraulic cam.  There is no lash or clearance with a hydraulic cam.  Hydraulic lifters need preload, not lash.  With the engine warm you check each lifter preload by backing off the adjusting nut to where the pushrod has some slack (I check this by moving it up and down as I find this more accurate, others will say spin the pushrod in your fingers).  Tighten the adjusting nut to where there is no longer any slack, and then go 1/2 turn tighter.  You adjust the intake valve as the exhaust valve is opening and vice versa.  Then move on to the next cylinder. 
     

    i always thought that stock heads has solid lifters .  or i miss something ?
     

    Last edited by Alessandro (2/26/2022 12:01 PM)

       •Thread Starter
     

    2/26/2022 11:55 AM  #5

    Alessandro
    I FYI 24-7

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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: Something to know before valve leash

    MS wrote:

    If they were set when the engine was assembled, no need to mess with it ever again, most likely.

    yes , was set when rebild . 
    So if not needed , less job and more ride . thanks ! 
     

       •Thread Starter
     

    2/26/2022 4:02 PM  #6

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,497

    Re: Something to know before valve leash

    Only the 271HP 289 (Hi Po) has solid lifters.  All other 289s used hydraulic.

     

     

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