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Thread: Removing wrist pins
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13th November 2014, 07:41 PM #1Senior Member
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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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13th November 2014 07:41 PM # ADSGoogle Adsense Advertisement
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13th November 2014, 09:30 PM #2
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.
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13th November 2014, 10:37 PM #3
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.
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14th November 2014, 12:38 AM #4GOLD MEMBER
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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
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14th November 2014, 02:27 AM #5Retired
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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.
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17th July 2015, 07:51 PM #6Senior Member
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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
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17th July 2015, 08:21 PM #7
Now that's cooool
Sent from my iPhone using Tapatalk
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18th July 2015, 12:01 AM #8GOLD MEMBER
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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
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18th July 2015, 01:16 AM #9Member
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Hi look like holden V8 rods A9L rods?
Tony
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18th July 2015, 11:42 AM #10Senior Member
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