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Technical Y block oil priming.

Discussion in 'The Hokey Ass Message Board' started by Boden, Dec 30, 2020.

  1. Boden
    Joined: Oct 10, 2018
    Posts: 747

    Boden

    Built a 292 the other day and got around to priming it. It will get oil to the passengers side bank no problem. But nothing to the drivers. I figured the cam bearing was in wrong, so I pulled the cam and sure enough it was, replaced it with a new one and made sure it was aligned correctly. It is, same exact thing happened again. I can’t figure it out. Please give me some ideas. I can even stick a rod through the hole in the deck through the cam bearing.and even if u pump it up with the head off I still don’t get oil to it.


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  2. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,572

    Boneyard51
    Member

    Does your cam or cam bearing have a groove in that bearing?








    Bones
     
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  3. 51504bat
    Joined: May 22, 2010
    Posts: 3,392

    51504bat
    ALLIANCE MEMBER

    Maybe @mctim64 will have a suggestion. He is all things to Y Blocks.
     
  4. Blue One
    Joined: Feb 6, 2010
    Posts: 11,256

    Blue One
    ALLIANCE MEMBER
    from Alberta

    That’s the best advice.
     

  5. Blue One
    Joined: Feb 6, 2010
    Posts: 11,256

    Blue One
    ALLIANCE MEMBER
    from Alberta

    There is one thing that you can take a look at, is it possible that you have your rocker shaft rotated slightly on that bank so that the oil flow hole is blocked preventing oil getting into the shaft and then the rockers ?
    Don’t know if that’s possible or not.
     
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  6. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,037

    anthony myrick
    Member

    Following. Considering startling a y block build.
    Been reading oiling/cam bearing threads
     
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  7. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 8,232

    junkyardjeff
    Member

    Try turning the engine over while priming.
     
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  8. miker98038
    Joined: Jan 24, 2011
    Posts: 742

    miker98038
    ALLIANCE MEMBER

    If you don't get an answer here, post it over at yblocksforever. Ted Eaton had a post this morning, and there's not much he doesn't know about a Yblock.
    There's some evidence that some cam/bearing combinations don't oil right, and some that many cams don't have the groove cut deep enough. The comment about the rocker arm shafts is correct, but if the heads off it's not that.
     
  9. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,992

    jimmy six
    ALLIANCE MEMBER

    Since your not getting anything at the hole at the head The cam bearing groove needs to be deeper or the block behind the cam bearing needs to have a groove.
    Did the cam bearing have a groove? It is important that the cam bearing surface still get enough oil too.

    The left rocker arm shaft can only correct or upside down.

    If there is no groove at all you need to be rotating the engine when priming. So it will squirt up the block and to the head.

    Also at the bottom of the head the hole should be chamfered to help flow when you get the oil working.
     
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  10. anthony myrick
    Joined: Sep 4, 2009
    Posts: 10,037

    anthony myrick
    Member

    Not to hijack.
    But, before I buy cam bearings, I need to know what brand cam?
     
  11. FrozenMerc
    Joined: Sep 4, 2009
    Posts: 2,817

    FrozenMerc
    Member

    No.

     
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  12. FrozenMerc
    Joined: Sep 4, 2009
    Posts: 2,817

    FrozenMerc
    Member

    Oil Flow takes the path of least resistance. I agree with trying to spin it over and then try re-priming. Or even just block the passenger side off and see if any comes up to the drivers side.
     
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  13. Dominick Hide
    Joined: Dec 13, 2007
    Posts: 226

    Dominick Hide
    Member

    I suspect you are working with a cross drilled center journal camshaft, as opposed to the later grooved one. If so then turn the engine a few degrees and then try priming again. It may take two or three turns but pretty sure you will see oil out of the driver side before you have gone 90 degrees. (and passenger side will stop).
     
  14. Boden
    Joined: Oct 10, 2018
    Posts: 747

    Boden

    Cam has a grove. Bearings do not


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  15. Boden
    Joined: Oct 10, 2018
    Posts: 747

    Boden

    I don’t even have the shafts or heads on. Oils not even making it to the head


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  16. Boden
    Joined: Oct 10, 2018
    Posts: 747

    Boden

    Block and bearing is neither groved. The cam does have a grove. But it’s probably no more than .060-.080 thou deep


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  17. As Jimmy Six and Frozenmerc said, rotate the engine while priming. This will require two people, one spinning the crank, or a remote starter switch to operate the starter.
     
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  18. lippy
    Joined: Sep 27, 2006
    Posts: 6,102

    lippy
    Member
    from Ks

    Start it. Lippy
     
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  19. glrbird
    Joined: Dec 20, 2010
    Posts: 574

    glrbird
    Member

    Check the hole in the block that comes from the center bearing. They get clogged, if wasn’t cleaned in the machine shop. A long drill bit and grease Will do the job.
     
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  20. miker98038
    Joined: Jan 24, 2011
    Posts: 742

    miker98038
    ALLIANCE MEMBER

    From John Mummert's site.

    Cross drilled cams, grooved bearings, all complicate this. Ted Eaton likes to grove the block.

    Go down to the cam listings.

    "NOTE: All new cam cores for Y-Blocks are manufactured with insufficient oil groove in center journal resulting in reduced oil flow to rocker arms."



    http://www.ford-y-block.com/valvetrain.htm
     
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