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Valve Train Lack Of Oil to Number One

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  • #1

    Engine: Valve Train Lack Of Oil to Number One

    Well , I went to my service manual and came up with nothing .

    1960 Lark 259 2 bbl , runs great , buy valve clearance on number one got a little noisy after 6000 miles . Pulled cover and number one valves looked DRY . Ran engine with covers off and all other rocker arms are getting plenty of oil volume . Oil pressure at idle hot is 20 .

    I am not familiar with the cause of this and am hoping for help from you all .

    Very curious to watch this take place on only one set of valves !

    Thanks

    Joe
    Tags: None
  • #2
    In this case, I would remove the valve train, take the two plugs out of the shaft and get rid of all the crud inside. Don't forget to clean the oil passages in the rocker arms too. Of course, if one side is drty, the other one will be as well.
    Nice day to all.
    sigpic
    • Likes 4

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    • #3
      Does your car have an oil filter? If so, maybe it’s lacking the correct restrictive fitting. This may cause lower oil pressure, not sure if it’s enough to cause your issue though.

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      • #4
        Sounds like blocked oil hole(s) in the rocker shaft for one or two rocker arms. As mentioned above the rocker arm shaft should be pulled, checked and cleaned.
        Dan Peterson
        Montpelier, VT
        1960 Lark V-8 Convertible
        1960 Lark V-8 Convertible (parts car)
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        • #5
          The oil escape holes in the rocker shaft are very small and plug up easily. Pull it and clean it.

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          • #6
            Originally posted by dpson View Post
            Sounds like blocked oil hole(s) in the rocker shaft for one or two rocker arms. As mentioned above the rocker arm shaft should be pulled, checked and cleaned.
            X2 - it's a PITA to disassemble, pull out the soft plugs and rod out the inside of the shafts, but most are full of crud and it's impossible to clean them externally. One can poke open the holes, but that's just pushing it back inside with all the other crud, which will soon plug the holes again.

            jack vines
            PackardV8

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            • #7
              Comment deleted.
              Last edited by dpson; 08-27-2022, 02:06 AM.
              Dan Peterson
              Montpelier, VT
              1960 Lark V-8 Convertible
              1960 Lark V-8 Convertible (parts car)

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              • #8
                Originally posted by dpson View Post
                One more thought, oil is fed to the rocker arm shaft via one of the rocker arm shaft support bolts which is necked down (reduced diameter) to allow the oil to flow by. Make sure this special bolt is in the correct position, otherwise oil flow to the rocker arm shaft will be restricted.
                All 8 bolts are recessed the same.

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                • dpson
                  #8.1
                  dpson commented
                  08-27-2022, 02:10 AM
                  Editing a comment
                  My memory was incorrect, perhaps it is the support stands that are different. Original comment deleted.
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