Re: Ideas on how to free a stuck 282 diesel.

Posted by Loren P on August 17, 2006 at 14:32:43 from (64.65.174.118):

In Reply to: Ideas on how to free a stuck 282 diesel. posted by dej(JED) on August 17, 2006 at 10:25:18:

Take the head off, and remove all the pistons that aren't stuck by unbolting the rods and tapping them up with a wooden dowel and hammer.

Go to NAPA and buy some Iron Etch (made by Martin Seynor paint,) it's basically phosphoric acid used in bodywork for prepping metal before priming. Hone out the cylinder above the stuck piston and clean it out good. When your ready to break it loose, pour about a 1/2" of the Iron Etch on top of the piston and let it sit overnight. Next morning, clean the solution out of the cylinder with some paper towels to keep from making a mess, then drive the piston down with a block of wood and a big hammer. If the piston's rod is still connected to the crank, probably have someone help turn the crank while you pound it down. This has worked for me every time, it's fast and easy. I've never needed more than a few good raps with a blacksmith hammer on a block of oak to get the piston moving, after using the Iron Etch.

If the piston is near BDC, you may need to unbolt the rod and swing it away if possible. Otherwise, you may have to turn the block upside down, pull the crankshaft out, then turn it over and pound the piston down, which is what I had to do on my W9 engine. I've used the acid with aluminum pistons and haven't had any problems. It will etch the cylinder wall slightly, but it will hone out. If you're putting in new sleeves & pistons anyway, it won't matter.

You definitely want to get the piston out, even if it were to suddenly free up, as the rings will be rusted in place in the piston grooves(even in an aluminum piston.)

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