Clattering noise when accelerating

Discussion in 'Technical' started by Rickeeling, Oct 7, 2018.

  1. Rickeeling

    Rickeeling Member

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    And all I did was change oil. This question is for the more experienced engine builders or perhaps one who has come across the same situation. The clattering is not present at idle, or when o reve the engine. It is not present when I break torque the engine in my drive way. The clattering noise is only present when I accelerate on the road driving. I have thrush mufflers so its hard to pinpoint the location. But to me it sounds like valve clattering. I have checked timing, it runs smooth and its not missing.

    All input or advise is welcome. I am at a loss.
     
  2. Rickeeling

    Rickeeling Member

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    This is my motor. 5.0 block form 91 T-Bird. Holly Heads, 1.7 rockers.
     

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  3. 71gold

    71gold Frank Cooper Supporting Member

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    did you also change the filter, if so it may be bad?
     
  4. Mavman72

    Mavman72 Gone backwards but lookin' forward

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    Bad U joint...
     
  5. Hotrock

    Hotrock Rick, an MCCI Member Supporting Member

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    You did not indicate what oil pressure your engine is producing. Do you have an oil pressure gauge?
     
  6. Rickeeling

    Rickeeling Member

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    I changed oil filter, I have checked the u- joints and I'm running about 40 to 50 psi on oil gauge.
    thanks for the reply guys. your knowledge and input on this forum is greatly appreciated.
    Yesterday I checked valve lash, that took about halve the day. Then my yard need my attention for the other halve.
    This morning I woke up with an idea that I have not check yet.
    The starter? could it be posable that it's the return spring on the gear?
    My hypothesis is that the gear is sliding back into the flywheel when accelerating. :hmmm:
     
  7. Rickeeling

    Rickeeling Member

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    1 2 3
    IMG_0454.jpg IMG_0455.jpg IMG_0456.jpg

    OK I checked out the starter this morning and these are the results.
    photo 1 is kind of hard to see but it looks like the gear is barley touching the flywheel.
    photo 2 is with the starter removed from car and gear pushed back.
    photo 3 is with the gear push forward.
    There seems like a lot of play to me, so I'm off to parts store for new starter.
    I thought of shimming the starter but didn't want to take a chance of cracking the bellhousing.
     
  8. Krazy Comet

    Krazy Comet Tom

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    Looks fine to me.

    I use the $35.00 ebay, PMGR starters(yes they are offshore, but are new).
    One on comet since '14 & another on my old '96 F-150.
     
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  9. Rickeeling

    Rickeeling Member

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    I took my starter to the store and picked up a new one. apparently there is a spring missing in my old one that keeps the gear back out of the way when deenergized.
    Installed the new one, took it for a drive an all is fine now.

    Thanks for every ones input, advise and perplexed head scratching.
    I hope that this post will help others in the future of what to check for, and don't give up.

    I will take an aspirn for all the head banging on the walls lately and take the wife out to dinner.
     
  10. yellow75

    yellow75 MCCI Oregon State Rep Supporting Member

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    Thanks for the update, we all got to learn something from this. Glad it was an easy fix. I like Krazy Comet use a pmgr starter lots easier to install especially if you have headers
     
  11. Krazy Comet

    Krazy Comet Tom

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    X2 on getting problem solved.

    There is a return spring that kicks the drive out of flexplate once engine has started, I've never seen one missing. I suppose it could have broken. The starter mounted solenoid kicks out drive on PMGR units.

    Numbered 76-2700 near top of pict.

    [​IMG]
     
  12. Rickeeling

    Rickeeling Member

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    Yes sir, missing, broken to a point of inoperable condition. I have never taken a starter apart, to easy to just go get a new one, remanufactured one or rummage a junkyard as I have done back in the day.
    when I picked up the new one, when I pulled on the gear it sprang back, as the older one did not.
    I presume that part # 76-2700 is the culprit?
    I'm going to purchase a PMGR as you suggested for future install.
    Thanks Tom
     
  13. Krazy Comet

    Krazy Comet Tom

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    Yes part 76-2700 but outside of a rebuilder, I have no idea where you'd get one. I believe spring was in repair kits you could buy 40 years ago. I've always liked to pull starters, alt etc apart, usually fairly easy to repair.

    BION I recently repaired the fender mounted solenoid on my F-150. Became intermittent supplying current to crank, so I pulled it apart(drilled rivets) and cleaned contacts. Been OK for a couple months. Requires unsoldering one wire inside, but that's easy enough(bought my first soldering gun with Green Stamps).
     
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  14. Hotrock

    Hotrock Rick, an MCCI Member Supporting Member

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    Probably a number of people on this website don't know about Green Stamps. My first purchase with GSs was a baseball glove. I still have it and it is setting on my desk.
     
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  15. Krazy Comet

    Krazy Comet Tom

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    Hey Rick, how you doin'?

    Is your glove here? Scan from the 1968 S&H catalog.
    greenstampbbglovesnip.JPG
     

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