Free stuck piston from cyl.???

[demo]

I have a set of 2.0 911S/906 P&C. they have been stored for 25 years. One is stuck. I have soaked in parts cleaner for days, submerged in ultra sonic cleaner, and used small torch to heat. Nothing as worked The piston is sticking up from cyl., to the top ring. Any advise?

Stephen

[304065]

Heat the entire thing in a 400 degree oven for an hour, then remove it USING HEAT RESISTANT WELDING GLOVES and hit the piston with a plastic mallet.

[demo]

that I like, doing it now

[davep]

Are these 80 or 81mm? Two rings or more?

[demo]

They are 80 MM, 3 ring, and will be for sale in the future.

[jonnyw]

I fully agree with John Cramer, that is exactly what will do it every time. Instead of a parts cleaner I soak them in Diesel fuel and this napa rust remover liquid. If that doesn't break it free then the oven is the next best thing. I wouldn't use your home oven when the wife is around though!!

You might need to do that a couple times though, I have had a T piston stuck so bad that it too 3 times to finally get it to break loose.

A year ago I called this local used appliance store and told them I wanted an electric oven without top burners and as big as possible. They had an old GE that they modified for me so the Top Broil element and the bottom element would turn on at the same time. Then they put hotter thermostat on there for me. I still use it today for breaking rusted items , powdercoating and Hot temp curing. Its the best 100$ i've spent..

JW

[John Straub]

Are the '67 911S and 906 PC the same?

Are the any markings on them...the reason I'm asking, is, I have NOS set of
'67S PC.

Thanks,
John

[demo]

The answer is no, but the picture of mine should look considerably different than yours. Especially the top, crown, big valve recesses. Some are of the opinion that the 69S & 906 are the same. But my research and pictures I have seen, show a noticable difference in the top.

[demo]

hour in the oven, beat with a leather hammer, not a budge!!??

[jonnyw]

I've been there and it sometimes takes time.

Try this, go get a plastic bucket and a gallon of diesel fuel, and if you can find a couple cans of PB Blaster.

Spray both cans into the top of the cylinder and then slowly add in the diesel fuel. Let it sit again as long as you possibly can agitating it whenever you get a moment. No bid deal. If you can soak it like that for a couple days even better. Cover it diesel is stinky.

Then once you've waited as long as you can, try the oven technique again. Keep your super solution. just in case it takes a couple tries.

I've been there and patience is the only way or else you wind up completely destroying those parts and if you've made it this far I know thats what your trying to avoid.


Another way, I have done it .

Drill a hole the same diameter of the cylinder , put the cylinder in the hold the make a contraption of sorts that has a my case I used a heavy duty pip with a large rubber end, home depot stuff. I put the pip with the rubber end over the cylinder in a box I build and used weights and put about 150 lbs of weight into the piston head kept it on there as I soaked and let gravity do its thing . It was setup like that for a couple days and I went out to the garage and the piston had broken free and was wresting at the bottom of the cylinder and my weight contraption was still in the same position just followed the piston down. It takes a couple hours to build but it works and you can use bricks or any heavy item you can find just make sure to rig it up so they all are contained vertically.

I hope I explained it ok. Little tired