1G Removing OEM Wrist Pins?

[DSM Chase]

Need to Replace Two bad Rods on good 6 Bolt OEM Pistons, I know the pins are pressed in...I talked with a local machine shop and they said likely it would break the piston trying to remove them? Just trying to put a set of GOOD stock rods on them, anyone had experience doing this?

 

[Dsmkauai]

I pressed mine In and out with no issues bro! Used a press and the right tools and all good in and out! They came out pretty easy and unless you have it setup wrong, you won't break the piston. If that guy can't switch rods for you I would suggest going somewhere else!

 

[1990dsmkid]

Ive been told they break aswell and Bogus was one of many who said it. I trust his word but Im sure if you do it right theres a chance of doing it. Im going to try it and plan on soaking them for awhile and getting them well lubed up and make sure I have them setup the best way possible and hope for the best. If you do it yourself and are successful, repost back if you did anything that you think helped.

 

[DSM Chase]

Lol I Figured, May Just do it myself we have a press here at the shop need to learn this anyways!

 

[donniekak]

They don't always break, but most shops won't take the risk, as it can easily happen pressing the pin out of the old rod/piston.

There is a special fixture that can be used on some piston/rod setups that only presses against the rod.

 

[bryanwheat]

To do it properly you will need to heat the rod. Heat the small end up with a map gas torch and the pin will press out real easily. If you try to press the pin out or in without heating the rod, you will likely damage the piston every time. To insert the new pin in the rod it is a good idea to have a rod heater and a jig that will only allow you to install the pin to the correct depth, because once the rod cools the pin will be too tight to move.

 

[1990dsmkid]

Cant the small end be damaged or weakened by heating up and not doing it properly? Its kind of hard to get it evenly hot acrosses the surface with a map tourch. I thought of this but was told it could damage rod if not evenly heated. Im going to assume the best answer is to find a machine shop that can press out and press in new pins?

 

[bryanwheat]

Cant the small end be damaged or weakened by heating up and not doing it properly? Its kind of hard to get it evenly hot acrosses the surface with a map tourch. I thought of this but was told it could damage rod if not evenly heated. Im going to assume the best answer is to find a machine shop that can press out and press in new pins?

This is the method that all machine shops use. It is the only correct way to do it, so i would say no, it doesn't weaken the rod at all.

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[1990dsmkid]

Ok thanks man. I guess Ill give it a shot at removing the pins but have a shop install new piston/pins so the depths are right and i dont ruin anything.

 

[tkrPerformance]

I made a holder for the piston to press the pins out. i have never broken one with it

 

[bryanwheat]

I made a holder for the piston to press the pins out. i have never broken one with it

You could of easily scuffed the inside of the piston where the wrist pin slides thru. When you press the pin out and in you are putting all the pressure on the piston, and it is very easy to damage the inside bore with the wrist pin on install. I have done them that way also successfully, but i have also damaged a few over the years.

 

[donniekak]

There is a fixture that only holds the rod to press them out, and puts no stress on the piston.

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[1990dsmkid]

can this holder setup still be bought? This would be a nice toll to have.

 

[motomattx]

If you have around $1000 it can be bought. The one we had which looks just like that one was some outrageous amount of money to buy new, at one time I had looked into buying one myself.

 

[1990dsmkid]

Wow thats hard to believe something like that cost that much. Its unreal how much stuff cost.