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Old 06-21-2010, 05:01 PM
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Piston Stuck

I started tearing down my 283 and found that I have one piston stuck in the bore due to rust. I have it soaking in wd40 and mystery oil. Would PB Blaster or some other penatrant work better? Anybody have one that they found works really well? Is there another method I can use to loosen the piston? I don't have a torch but I do have a propane burner if heat helps.

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Old 06-21-2010, 05:22 PM
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stuck piston

Hi Mertz, do you want to reuse the piston..?
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Old 06-21-2010, 06:05 PM
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Mystery Oil is what we always use. I would be carefull with the PB and aluminum, it seems to be able to eat through anything if given enough time
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Old 06-21-2010, 06:48 PM
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Yes I want to reuse the pistons. The bores aren't bad and I hope a honing and rim ream would be all I need. This is going to be a very low cost stock rebuild using as much as I can from the original.
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Old 06-21-2010, 08:08 PM
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If it's stuck in the bore, there is a better then even chance that when those rings finally give up their rust and allow the piston to come out that there will be a ridge in the bore that honing wont remove This will create problems with the new rings and may require a rebore.

As far as a rust breaker - Marvel oil, PB Blaster, Kroil, transmission fluid(hot if possible) or even Coke will work. WD40 may be the most useless as it, in today's formula compared to the past, has very little lubricating properties and really is a Water Dispersant and is the 40th attempt

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Old 06-21-2010, 09:52 PM
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I'll agree, if it is rusted to the bore enough to freeze the piston, rehoning is likely to be out the window. You will probably have to bore it.
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Old 06-22-2010, 12:03 AM
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Are all the other pistons out?

If you are able to push the piston down its bore far enough to allow you to reach all the rusted area of the bore, you can use wetted emory paper to get the rust out, stopping short of getting down to "shiny" metal. This requires a soft touch and not much pressure applied by the paper, along w/a lot of kerosene mixed w/a little motor oil for lubrication. Keep trying to remove the piston as you work also.

Keep checking the bore diameter as you work. You will see soon enough whether there's any hope for just honing the cylinder.
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Old 06-22-2010, 09:00 AM
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The piston won't move. I think I am going to give coke a try. That usually eats anything. The rod is also stiff on the piston but I can move it.

Thanks for the input on the bore. If I have to bore I will.
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Old 06-22-2010, 10:33 AM
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Call me crazy but I think a slightly modified version of this might work for you.. Just bolt it to the block using the head stud holes and crank the center bolt down it will essentially pull up on the block (which won't move) and push down on the piston enough to break the rust free

Remove Flywheel Stuck on Crankshaft

Last edited by SS66chevelle; 06-22-2010 at 10:45 AM.
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Old 06-22-2010, 02:18 PM
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Quote:
Originally Posted by Mertz
The piston won't move. I think I am going to give coke a try. That usually eats anything. The rod is also stiff on the piston but I can move it.

Thanks for the input on the bore. If I have to bore I will.
Coke will make a mess and that's about all- the oil that has already been applied will keep the Coke from reaching metal for the most part.

In this case- the piston is well and truly stuck- and PB Blaster has failed to allow it to move, you need to break it loose. This can be done w/a big hammer and a 1" round wooden dowel. Use it to beat the piston up from the bottom, down from the top until there's some amount of movement.

Then use the PB Blaster on it and you will be able to work it loose.
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Old 06-24-2010, 08:49 AM
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The piston is still soaking in oil and doesn't seem to be doing any good. I think I am going to build a plate with either a grease fitting or air fitting so I can put some pressure on top of the piston and force some oil past the rings. I think I will try air first using a tire valve so I don't over pressurize it and break things. With this system I can invert the engine and attack it from the back side as well.
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Old 06-24-2010, 09:54 AM
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Quote:
Originally Posted by Mertz
The piston is still soaking in oil and doesn't seem to be doing any good. I think I am going to build a plate with either a grease fitting or air fitting so I can put some pressure on top of the piston and force some oil past the rings. I think I will try air first using a tire valve so I don't over pressurize it and break things. With this system I can invert the engine and attack it from the back side as well.
If the old head gaskets aren't completely ruined, you might be able to reinstall the head and use the spark p-lug hole to pressurize the top of the piston.

I think tapping it w/a dowel will get it moving some, I just don't see the old piston as being reusable in this bore anyway.
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