Can this still be Used?

[Trip660]

Hello all. I’m wondering if anyone has tried and successfully used a piston pin that’s obviously overheated when the piston fried? Does the metal change so that it’s to soft and or weak rendering it unusable? Something like this:

 

[GenXer]

Cooking them to that temperature makes the steel harder and easier to break.

 

[link]

It don't seem damaged to me. An aluminum piston melting at 600c is very different to the properties of hard steel.

 

[Mad Professor]

If it's smooth and mics true should be OK, what is cost of OEM?

 

[ammoaddict]

I would shine it up a little with some Ulta fine scotchbrite, if it fits good in the bearing and piston, I would use it.

 

[BrettS]

Use it, I try use the OEM pins if I can.

 

[Wood Doctor]

I have enough used piston pins to play checkers with them. But, the kings would probably fall over too easily during the game.

 

[cookies]

I would use a new pin and bearing, new pistons come with one for a reason. For 20 bucks you can get a new oem pin and bearing, aftermarket pistons may require a proprietary pin.
Will it work if its not worn or out of round? Yes but its not worth having it cause a problem at 9000 rpm cutting wood in a emergency or with my name attached to it after selling it.

 

[BrettS]

I would use a new pin and bearing, new pistons come with one for a reason. For 20 bucks you can get a new oem pin and bearing, aftermarket pistons may require a proprietary pin.
Will it work if its not worn or out of round? Yes but its not worth having it cause a problem at 9000 rpm cutting wood in a emergency or with my name attached to it after selling it.

I have fitted used pins and bearings in a lot of saws (some in commercial service) and have had no problems yet.

 

[cookies]

I have fitted used pins and bearings in a lot of saws (some in commercial service) and have had no problems yet.

I have reused wrist pins too but they were in excellent shape. I do not reuse blued pins or pins that have wear, bearing marks from sitting, corrosion or pitting.

 

[BrettS]

I have reused wrist pins too but they were in excellent shape. I do not reuse blued pins or pins that have wear, bearing marks from sitting, corrosion or pitting.

Obviously.

 

[ChillyB]

The pins are likely heat treated. Typical heat treat increases hardness for wear resistance. For a high volume part like this my guess would be using an induction coil to make it orange followed by a quench (the quench makes it hard). The pins might then be placed in a tempering oven which brings the hardness back down a little bit. Overheating the pin like this would have further tempered the part, MAYBE softening it (not hardening) a little more. Risk is slightly faster wear. No way it’ll break. I’d use it. But I would for sure not reuse the wrist pin bearing.