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Technical flathead fuel pump rod

Discussion in 'Traditional Hot Rods' started by sawbuck, Feb 29, 2020.

  1. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

  2. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    just fired my rebuilt 8ba ...i had to gravity feed the gas...i have no movement on the push rod to pump ..new isky 77as if there is no lobe on the cam.... any ideas ?
     
    dana barlow likes this.
  3. Is it the correct length rod,,I have heard,,there are different lengths .
    Oh yeah,,,,beautiful Flathead,,,looks great !

    Tommy
     
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  4. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    yes i have two motors with the correct rods ...i can hold the rod while i turn the motor ..there is no lift
     
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  5. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    thanks tommy it sounds great too. cept for this problem...really dont want to go electric
     
  6. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    i have two 10 1/16 rods ...
     
  7. I understand completely.
    There might be a possibility of a bad cam with no fuel pump eccentric,,,,I have never heard of that though .
    So,,,you are saying you can physically hold the pump rod and there is not any lift at all ?
    It must be a bad camshaft I guess,,,,,I have read where some have had quality issues with Isky lately.
    I think the issue then was the press on gears for the oil pump drive .

    Tommy
     
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  8. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    yes i can hold the rush rod i get nothing...i guess its better than a valve lobe ! ....i can run a electric pump ...better than changing the cam . still SUCKS !!
     
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  9. 1930ModelA
    Joined: Sep 4, 2008
    Posts: 105

    1930ModelA
    Member

    Good possibility that whoever installed rear cam bearing went too far aft. Pushrod will not contact cam.
     
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  10. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    thanks for the info ..i will look into that...will i see the bearing looking through the hole
     
  11. 1930ModelA
    Joined: Sep 4, 2008
    Posts: 105

    1930ModelA
    Member

    Yes, If that’s the case.
     
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  12. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    thanks' it sounds like your on to somthing...if i pull the trans and flywheel will the back cover get me there to press the bearing in ?
     
  13. Boden
    Joined: Oct 10, 2018
    Posts: 668

    Boden

    Yes. Look down the pushrod guide and see if you see the edge of the bearing. It shouldn’t stick out any more than the guide hole


    Sent from my iPhone using H.A.M.B.
     
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  14. j ripper
    Joined: Aug 2, 2006
    Posts: 713

    j ripper
    Member
    from napa ca.

    I’ve experienced this!
     
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  15. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    thanks ripper..you guys have me going in the right direction .. it is starting to make sence now ...will keep you posted
     
  16. 1930ModelA
    Joined: Sep 4, 2008
    Posts: 105

    1930ModelA
    Member

    Your stretching my ability on this one. I am unsure that you would have clearance to access the bearing with the oil pump gear there.
     
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  17. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    just went out to the garage ... looked down the hole .the bearing is pressed in to deep. about a 10th of an inch overhang ..thats how far it has to go forward ... if i pull the trans and flywheel can i remove the gear can i press the cam bearing forward?
     
  18. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    thanks, you nailed it !
     
  19. Man,,I never thought of that.
    But,,,I don’t see how you will be able to get to the bearing.
    After you remove all the back side,,,and remove the drive gear for the oil pump,,,,the rear cam journal will still be in the way .
    If you had an old bearing,,,you might could use it to drive around the cam .
    But,,,would you risk damaging the new bearing by doing this.
    Could you have a piece of pipe turned down to fit around the journal ?

    Is there any way you could fudge the rod past the bearing opening ?
    You say a tenth of an inch,,,the bearing holes are very large,,,,would it give you enough room to force the rod past the opening ?

    Man I really feel for you,,,,,there doesn’t seem to be a good way around it short of pulling the cam and lifters,,,valves.

    Tommy
     
  20. Hey,,,what about taking the rod and spinning it down a few thousandths ?
    Only at the very bottom where it goes through the bearing ?
    It would still give enough diameter to work ,,and still be durable and not wear bad .
    What do you think,,,about an inch or so at the bottom,,,1.25 maybe ?

    Tommy
     
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  21. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    i though about massaging. ha ha ! a tapered punch down there. or i have an extra rod to sacrafice .. the overhang is minimal and the bearing is soft ....or the dreaded electric pump!!
     
  22. Why don’t you try to tap your spare rod by it and see how close it is,,,it might slip right by,,,you never know until you try .

    Tommy
     
  23. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    tickle it by ?
     
  24. lol,,,yeah,,,tickle it,,,,I have never heard it put that way ,,,Lol.
    But,,it might be your best bet,,,I think it is worth a try at the least .

    Tommy
     
  25. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    i think i like your idea of turning it down on a lathe ...wont damage the bearing
     
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  26. j ripper
    Joined: Aug 2, 2006
    Posts: 713

    j ripper
    Member
    from napa ca.

    This is exactly what i did.
     
    Last edited: Feb 29, 2020
    Desoto291Hemi and sawbuck like this.
  27. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    update ...i ground an extra push rod and worked it in circles and up and down..it removed enough bearing material to fit the stock rod in... it was not much just enough to stop the rod from hitting the lobe..up and running with the stock push rod ...just had to Tickle and massage the bearing a bit ! thanks HAMB and Ford Barn for all your advice...i really thought i had a new cam with no fuel pump lobe !!!
     
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  28. Flathead Dave
    Joined: Mar 21, 2014
    Posts: 2,781

    Flathead Dave
    ALLIANCE MEMBER
    from So. Cal.

    But why give in? You paid for the cam, have them replace it.
     
  29. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,863

    sawbuck
    Member
    from 06492 ct

    read above ^^^^^^its running! it was the cam bearing blocking the hole just enough to stop the rod from hitting the lobe ...hope the helps the next guy
     
    Desoto291Hemi likes this.
  30. Great man,,,,do you have a little video of it singing a sweet tune ?
    When you get a chance post a video,,,I would love to hear it .

    Tommy
     

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