Slant Six Forum :: Rusted tight engine

Coca-Cola. Yes, I'm serious; it is a solution of phosphoric acid that effectively eats rust.

Sand the rust out of the bores as possible and re-spray. Flip the engine up-side-down, remove the oil pan and spray the Blaster around the bottom of the piston skirts.

Next, start with the lowest pistons, the ones with the crowns closest to the top deck and remove the rod caps. Find a solid piece of wood that you can get down into and onto the under-side of the piston's head. Get a Big Hammer and beat the piston/rod assembly out of the bore... get mean with it. spray-in more solvent as you work.
Repeat until all the slugs are out.
DD

Quote:

Coca-Cola. Yes, I'm serious; it is a solution of phosphoric acid that effectively eats rust.

Precisely why I don't have any in the fridge. Would beer work?

You could always try Uric Acid..........

I am trying to free up an engine to tear down for future parts but it is stuck bad.
I have PB Blastered it for a week now and it just wont budge. I am tipping the engine stand over trying.

Anyone have any tricks and tips for me???

Author:	CARS [ Fri Mar 13, 2009 11:07 am ]
Post subject:	Rusted tight engine
I am trying to free up an engine to tear down for future parts but it is stuck bad. I have PB Blastered it for a week now and it just wont budge. I am tipping the engine stand over trying. Anyone have any tricks and tips for me???

Author:	SlantSixDan [ Fri Mar 13, 2009 11:37 am ]
Post subject:
Coca-Cola. Yes, I'm serious; it is a solution of phosphoric acid that effectively eats rust.

Author:	Doc [ Fri Mar 13, 2009 11:41 am ]
Post subject:
Sand the rust out of the bores as possible and re-spray. Flip the engine up-side-down, remove the oil pan and spray the Blaster around the bottom of the piston skirts. Next, start with the lowest pistons, the ones with the crowns closest to the top deck and remove the rod caps. Find a solid piece of wood that you can get down into and onto the under-side of the piston's head. Get a Big Hammer and beat the piston/rod assembly out of the bore... get mean with it. spray-in more solvent as you work. Repeat until all the slugs are out. DD

Author:	CARS [ Fri Mar 13, 2009 12:06 pm ]
Post subject:
Quote: Coca-Cola. Yes, I'm serious; it is a solution of phosphoric acid that effectively eats rust. Precisely why I don't have any in the fridge. Would beer work?

Author:	CARS [ Fri Mar 13, 2009 12:07 pm ]
Post subject:
Quote: Sand the rust out of the bores as possible and re-spray. Flip the engine up-side-down, remove the oil pan and spray the Blaster around the bottom of the piston skirts. Next, start with the lowest pistons, the ones with the crowns closest to the top deck and remove the rod caps. Find a solid piece of wood that you can get down into and onto the under-side of the piston's head. Get a Big Hammer and beat the piston/rod assembly out of the bore... get mean with it. spray-in more solvent as you work. Repeat until all the slugs are out. DD Alright Doc. I'll give it a try. Thanks

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Author:	keithjr [ Fri Mar 13, 2009 1:14 pm ]
Post subject:
If you have access to air tools you can use the chisel hammer with the attachment that is like a tapered rod with rounded tip. Just turn the engine upside down, push the rounded tip to the underside of a piston and pull the trigger. The vibration will shake something loose.

Author:	Reed [ Fri Mar 13, 2009 1:43 pm ]
Post subject:
I second the Coca-Cola trick. This is what I was taught in my high school auto shop class and I have seen Coke de-rust screws and nails. Go buy a 2-liter bottle and a funnel and fill up the piston bores with it. Let it soak for a few days and then put a breaker bar on the bolt in the crank snout and heave away.

Author:	slantsixbob [ Fri Mar 13, 2009 2:12 pm ]
Post subject:
Quote: Quote: Coca-Cola. Yes, I'm serious; it is a solution of phosphoric acid that effectively eats rust. Precisely why I don't have any in the fridge. Would beer work? i dont think beer would work but ill take any beer your willing to toss at me for the most part.

Author:	mopar [ Fri Mar 13, 2009 7:22 pm ]
Post subject:
I was told by an old tractor restorer about mixing Kerosene, WD-40, and Brake Fluid in equal quantities for this purpose. I have not yet tried it.

Author:	emsvitil [ Fri Mar 13, 2009 9:14 pm ]
Post subject:
You could always try Uric Acid..........

Author:	DusterIdiot [ Fri Mar 13, 2009 9:41 pm ]
Post subject:	Lol...
I just 'depistoned' the John Deere Block last week, and the pistons were stuck good in it. I used some 'gasket remover' and soaked the bores, then turned it upside down, pulled the mains and crank, then used a rod and BFH, and smacked them out the block...the bores couldn't get any worse with the rust, and the chrome top rings weren't too intact anyway.. they all came out, one was really stubborn though, and I thought I was going to split the piston.... Good Luck -D.Idiot

Author:	Joshie225 [ Fri Mar 13, 2009 9:47 pm ]
Post subject:
Quote: You could always try Uric Acid.......... Home Depot has a metal prep rust remover that's great for soaking rusty parts. I used it to get the rust out of the bores of a 383. I'm sure it helped disassembly, even though force was still required. It's not acidic either so it won't eat your clothes, hands or face.

Author:	rock [ Sat Mar 14, 2009 6:52 am ]
Post subject:	Cars, Parts? why mess with the pistons?
Cars, I am a locally famed parts squirrel so am curious why waste the effort on the pistons? Just pull everything else including the crank and cam and heave the block and pistons. There are more out there... The right iron oil pump is worth more effort than all the pistons put together. rock '64d100

Author:	RustyRamcharger [ Sat Mar 14, 2009 3:27 pm ]
Post subject:	Re: Rusted tight engine
Quote: I am trying to free up an engine to tear down for future parts but it is stuck bad. I have PB Blastered it for a week now and it just wont budge. I am tipping the engine stand over trying. Anyone have any tricks and tips for me??? Google "electrolytic derusting". Find or fabricate a plastic or plastic lined container large enough for the engine. A very large trash can or box lined with heavy plastic sheet would work. Fill the container with water to submerge the engine and mix in 1 tablespoonful of sodium carbonate (a/k/a "washing soda", found in the laundry soap aisle of the supermarket, or "pH increaser", found at pool/spa supply dealers). Put a scrap stel bar in the tank with the engine, but don't let them touch. Connect the negative clip from a battery charger to the engine. Connect the positive clip tot he steel bar outside of the liquid. Plug in the charger. In a few days reorient the bar and engine as required. The process works "line of sight", so reorient the parts until all surfaces have been derusted. If you used any penetrating oil in the engine, you'll need to use a solvent like carb cleaner to remove most of the oil before derusting. A member of the Mopar Mailing List www.moparmailinglist.com used this process to derust a big block engine a while back. iirc he left it in the bath for about 10 days. Ken

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Author:	Reed [ Sat Mar 14, 2009 3:43 pm ]
Post subject:	Re: Rusted tight engine
Quote: I am trying to free up an engine to tear down for future parts but it is stuck bad. I have PB Blastered it for a week now and it just wont budge. I am tipping the engine stand over trying. Anyone have any tricks and tips for me??? Is the engine stand a four wheel model? Three wheel versions are very unstable and won't let you exert maximum torque on the motor before tipping.