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  1. #1
    Join Date
    Feb 2012
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    Default Removing wrist pins

    I recently acquired 16 pistons with connecting rods. Is there an easy way to remove the wrist pin or do i need to take it to a machine shop. From what i understand, the pins are pressed into the connecting rod and float in the piston.

    Any help would be much appreciated.

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  3. #2
    Join Date
    Nov 2011
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    They maybe be held in either side with a cir clip .
    They may be a press fit.
    What type of metal are the pistons ?
    Cast iron cast aluminium ?
    The pins maybe steel.
    You maybe able to heat the pistons in boiling water say 5/10mins and then push out the pins.
    Are we putting the Pistons back into an engine or something else ?
    Some pics may help.

  4. #3
    Join Date
    Oct 2007
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    Alexandra Vic
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    Default

    Quote Originally Posted by steamjunkprops View Post

    From what i understand, the pins are pressed into the connecting rod and float in the piston.

    Any help would be much appreciated.
    From my experience, the pins normally are an interference fit in the piston and the the conrod is bushed and free to rotate on the pin as the thrust angle of the rod changes as the crank shaft rotates. To do it as you suggest would require bushings in both sides of the piston skirt.

    Depending on how tight an interference fit the pin is in the skirt, the skirt may be through drilled with the pin retained with circlips either end mounted in the skirt, one side of the skirt may be blind drilled and the other through drilled, with a circlip in the skirt on the through drilled side, or the skirt may be through drilled for a tighter fit and the pin being pressed in or out for assembly/disassembly.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  5. #4
    Join Date
    May 2011
    Location
    Murray Bridge SA
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    3,339

    Default

    Normally there is a circlip holding the pins in place, take them out and they should tap out with a drift. If needing to reuse the pistons use a piece of timber underneath so as not to damage the piston. By the way gudgeon pins, as they are called, make ideal square blocks for the milling machine.
    Kryn

  6. #5
    Join Date
    May 2012
    Location
    Canberra
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    1,820

    Default

    If the above fails, use your wife's good plug-in pan/wok and heat the whole assembly in oil.

    Once nice and hot (leave the big end out to grab it) you should be able to drift it out.

  7. #6
    Join Date
    Feb 2012
    Location
    Sydney
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    187

    Default

    Update: i managed to get the wrist pins out, sadly no easy way to do it, i bought a 6 tonne press.
    ImageUploadedByTapatalk1437122990.182360.jpgImageUploadedByTapatalk1437123011.194487.jpg

    And i turned them into lamps
    ImageUploadedByTapatalk1437123045.755417.jpg

  8. #7
    Join Date
    Nov 2011
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    Melbourne
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    Default

    Now that's cooool


    Sent from my iPhone using Tapatalk

  9. #8
    Join Date
    May 2011
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    Murray Bridge SA
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    What V16 did they come out of? Something like that would be a great gift for a mukanik. Great idea, thanks for showing.
    Kryn

  10. #9
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    Jul 2007
    Location
    Melton
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    Default

    Hi look like holden V8 rods A9L rods?
    Tony

  11. #10
    Join Date
    Feb 2012
    Location
    Sydney
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    187

    Default

    Quote Originally Posted by KBs PensNmore View Post
    What V16 did they come out of? Something like that would be a great gift for a mukanik. Great idea, thanks for showing.
    Kryn
    They are two different sets, i was told they are from a holden V8 but thats about the limits of my knowledge on them.

    I have one of they for sale on etsy and gumtree if interested.

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