Free stuck piston in cylinder???

[Retro]

I have a set of 2.0 911S/906 P & C. They have been stored for 25 years. One is stuck. I have soaked for days in parts cleaner, submeregd in ultra sonic cleaner, and heated with small torch. Nothing has budged it. Any advise?

Thanks,

Stephen

[Talewinds]

I'll take'em!
Oh... deceiving thread title.

Try soaking in liquid Ammonia. Not the Windex kind, but the commercial concentrate type, available in a big jug from Home Depot.

[Retro]

I will try

[User Name]

I'd try the heat a bit more
another option would be to use one of these
piston dead blow hammer

heating the barrel and tapping with the hammer, might well shift it

[Retro]

An hour in the ove at 350, smack with leather hammer, no movement!!??

[sc_rufctr]

Instead of hitting it you could try a press...

Keep in mind that the stuck part is at the edge of the piston so you need the pressure applied at the edges. (hate to be so obvious)
I've never liked hitting a piston with a dead blow hammer or similar... Just never felt right doing it that way.

Make a plate almost the same size as the piston to protect the top from the ram of the press.
Use something that doesn't compress between the plate and the piston at the edges. What you're trying to do is apply the pressure from the press to the edges of the piston not the centre. You could try a tightly twisted oil soaked rag or if you have a lathe you could make an alloy ring that sits around the edged of the piston top between the piston and the plate.

Spray about half a can of WD40 around the edges on the piston.... Heaps and Heaps... Then let soak for a while.
Then gently apply pressure to hold everything in place then viewing from the side apply more force until it moves.

With enough force it will move but you run the risk of damaging the piston and cylinder. (hate to be so obvious ~ again!)

But then again, until you get that piston out it's junk anyway...

[User Name]

I'm thinking perhaps the piston is now stightly twisted to the bore, like if you've hit it on one side rather than the centre, maye it's now lodged slightly at an angle to the bore, hitting it now is only going to make it worse
if you have access to a verier caliper or similar, measure the depth down to the edge of the piston all the way around, if you have a high edge, it'll be that giving you the trouble, and you'll need to tap the piston level before you'll be able to get it out
a press might be a good idea, as when you've got the barrel sat square on the press, and push down on the piston, it'll true the piston up freeing it
odviously put something on top of the piston to protect the crown
take it to your local engineering shop, ask to use the press

[sc_rufctr]

Hey we had the same idea...

If we were teenagers we would say "SNAP"... lol

[User Name]

Originally Posted by sc_rufctr

Hey we had the same idea...

If we were teenagers we would say "SNAP"... lol

we did :lol:
how is adelaide, I have fond memories of henly beach

[sc_rufctr]

Adelaide is great. I live at West Lakes so Henley Square is a frequently visited "watering hole" for me.

Were do you live?

[User Name]

Originally Posted by sc_rufctr

Adelaide is great. I live at West Lakes so Henley Square is a frequently visited "watering hole" for me.

Were do you live?

sadly I'm in the UK
was 10 years ago, I drove a VW kombi 40,00kms around OZ
loved every second of it
I think apollo bay was one of my favourite places on the whole trip
christmas '99 we BBQ'd half a kangaroo on the beach at kingston (is it, the lobster place, where there's that HUGE fibreglass lobster)
those were the days
another thing I miss from OZ are blundestones, they are SO expensive here

[sc_rufctr]

Originally Posted by User Name

sadly I'm in the UK
was 10 years ago, I drove a VW kombi 40,00kms around OZ
loved every second of it
I think apollo bay was one of my favourite places on the whole trip
christmas '99 we BBQ'd half a kangaroo on the beach at kingston (is it, the lobster place, where there's that HUGE fibreglass lobster)
those were the days
another thing I miss from OZ are blundestones, they are SO expensive here

All good... Adelaide hasn't changed much. There's still that "hotrod" culture here.
I love that I can drive my 911 all week and not see another air cooled 911... But there are plenty of the later water cooled cars here.
Everyone I know is worried about the recession and stuff so they're entertaining at home.
I wear "Blundstones" almost daily for my work. I'm team leader in IT support but some of our clients have safety clothes requirements on their sites. Great shoes!

I've eaten at the Lobster Place at Kingston. Great atmosphere if you can get past the fibre glass "sculpture" outside.
Check this out... http://www.360travelguide.com/360VirtualTour.asp?iCode=ade11

Back on topic... How robust are these earlier pistons especially the ring grooves?
The press should work as I've used it on old VW engines that I've rebuilt... But never had to on a Porsche.

[User Name]

another thought, does the piston still have the wrist pin in it (connecting rod) by us
maybe you could try pusing it out the top
if it doesn't then I wouldn't push it that way

the piston should be able to cope with a bit abuse bashing it
after all it holds back a very quick burn, almost an explosion millions of time in it's everyday job

[john walker's workshop]

molasses. let it sit a couple of days.

[sc_rufctr]

Originally Posted by john walker's workshop

molasses. let it sit a couple of days.

Seriously?

[User Name]

Originally Posted by john walker's workshop

molasses. let it sit a couple of days.

how's that gonna work

[Porsche_monkey]

Check the interweb for the molasses idea, commonly used by antique car rebuilders. I used to use it as a rust remover. It works, but it takes a few days of immersion. And it smells good.

You could also try a mixture of brake fluid and tranny fluid. That is supposed to work well. I would go straight to the press if it were mine.

[88911coupe]

it's good on waffles too...

[HawgRyder]

As weird as this sounds.....Coka-cola...the real stuff....not the de-caff/diet/whatever.
Sit the cylinder upright.....pour in the Coke....let sit over night...then try again.
I have used this on very old flat head style motors with great success.
Luck
Bob

[sc_rufctr]

Use a press.... Stop mucking around and get it done...lol