3.4 connecting rod help
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Newbie
Joined: Aug 2010
Posts: 21
From: port trevorton pa
3.4 connecting rod help
iv got a 3.4 out of a 94 that im rebuilding the block is at the shop awaiting the new pistons a set of keith black 30 over and they said i can use my stock connecting rods the problem being i dont know how to remove the stock piston from the connecting rod. there looks to be a 2 piece wrist pin with some form of a stopper between the two that stops me from pressing the pin out any one know how to remove the wrist pins
Overdrive Member
Joined: Apr 2010
Posts: 3,354
From: Spanaway, WA
Take the old and new to a machine shop, and have them do it for you. They will know any tricks needed to remove the pins. Also you will need new pins. You can use old rods but not old pins they are a one time use only device.
Massey
Massey
Overdrive Member
Joined: Apr 2010
Posts: 3,354
From: Spanaway, WA
Heating up the end helps get them out without damaging the rod but it wont drop out. Some places will soak the pins in liquid nitrogen to shrink them to assist in the installation. usually a good engine machine shop will have what is needed to get them out and back in with out hurting anything. Plus if they hurt the rod they buy you a new one.
Massey
Massey
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The Long of it:
The 3.4 uses a floating piston style wrist pin. According to the GM manual it can be reused as long as piston cleances and rod fits are within spec and there is no gouges or galling. You do need a special tool J-24086-8 along with J-24086-905 adapter to dissassemble and assemble the piston/rod together.
The short of it:
Like Massey said take to a machine shop. The whole point of the above tool is to protect the piston from the high pressure needed to press the pin in/out of the rod. The machine shop does this all day long. They most likely do not have the above tool but they will make a setup that will work. If you scew up while pressing the pin back in it could cost you a piston if you do not get the pin in the right place it could cost you a motor.
Good Luck
The 3.4 uses a floating piston style wrist pin. According to the GM manual it can be reused as long as piston cleances and rod fits are within spec and there is no gouges or galling. You do need a special tool J-24086-8 along with J-24086-905 adapter to dissassemble and assemble the piston/rod together.
The short of it:
Like Massey said take to a machine shop. The whole point of the above tool is to protect the piston from the high pressure needed to press the pin in/out of the rod. The machine shop does this all day long. They most likely do not have the above tool but they will make a setup that will work. If you scew up while pressing the pin back in it could cost you a piston if you do not get the pin in the right place it could cost you a motor.
Good Luck
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