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Engine knock

Discussion in 'The Hokey Ass Message Board' started by Oldsmobucket, Mar 8, 2016.

  1. Oldsmobucket
    Joined: Dec 11, 2005
    Posts: 331

    Oldsmobucket
    Member

    Been trying to diagnose this knock in my 1955 324 Oldsmobile. I think it's in the valve train. But not sure. Took the valley pan off and took a little video. Any help is greatly appreciated.
     
  2. Atwater Mike
    Joined: May 31, 2002
    Posts: 11,625

    Atwater Mike
    Member

    Pull the valve covers, engine idling take a '006" feeler gauge and slip it under the rocker at the valve stems, one at a time. When you quiet the TAP, (knock is anomatopoeiac) you will have located the lifter/pushrod/rocker/valve guide that is causing the TAP.
     
  3. Oldsmobucket
    Joined: Dec 11, 2005
    Posts: 331

    Oldsmobucket
    Member

    Cool. I'm gonna go try that in a minute. So u think it's a valve train issue ?
     
  4. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 6,803

    arkiehotrods
    Member

    Sounds like it to me
     

  5. PunkAssGearhead88
    Joined: Jul 9, 2006
    Posts: 1,788

    PunkAssGearhead88
    Member
    from So Cal

    Wear some gloves and try carefully pulling one spark plug wire off at a time, if the sound goes away or changes then that will at least tell you what cylinder it's coming from. It sounds more like valvetrain to me as well than it does bottom end.
     
  6. Oldsmobucket
    Joined: Dec 11, 2005
    Posts: 331

    Oldsmobucket
    Member

    I tried using the feeler gauge at .006 there was no change. Tried every valve. Gonna try pulling plug wires to try and narrow it down
     
  7. Atwater Mike
    Joined: May 31, 2002
    Posts: 11,625

    Atwater Mike
    Member

  8. Oldsmobucket
    Joined: Dec 11, 2005
    Posts: 331

    Oldsmobucket
    Member

    Might try and put a dial indicator on each rocker arm and see if there's any big difference between the valves. The crazy thing is most of the time it makes the noise in the video and sometimes it make a lower frequency knock. This thing drives me crazy hahaha
     
  9. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,856

    302GMC
    Member
    from Idaho

    Going by the sludge, it sounds about average for a '49-'56 Olds ... the whole valve train rattles, but doesn't ever seem to give trouble unless you decide to clean things up ...
     
  10. Oldsmobucket
    Joined: Dec 11, 2005
    Posts: 331

    Oldsmobucket
    Member

    Probably just put it back together and drive it until something lets go. And save up for a rebuild
     

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