How to free stuck piston rings? Make piston stew!!
I am rebuilding an LS/vtec for my DelSol build and ran into some SERIOUSLY stuck piston rings. Everything I tried wouldn't free (soaked them in PB, tapped at them, cleaned around the rings, blah blah blah) them so it called for extreme measures...and a hell of a good trick.
Pistons with stuck rings
Enough water to submerge pistons
Cook over medium to high heat and bring to a boil. Boil over high heat for approximately 20 minutes, then start removing every five minutes and attempting to remove the piston rings.
Re: How to free stuck piston rings? Make piston stew!! (JDogg)
Originally Posted by JDogg
um..i hope ur not reusing those pistons?? if the rings were stuck that bad then the lands are probably collapsed
No really...they're not, it's just combustion byproduct that gets behind rings and sticks them...it's quite common in higher mile motors. The deposits behind the ring actually build and push the ring out harder and harder, and it breaks down the oil barrier. The higher heat just further "cooks" the carbon and sticks the ring worse. The tell tale of this occurrence is that the rings look HIGHLY polished. Sometimes the metal will even break down kind of "weld" them in a very loose sense.
Boiling them just allows the water to work it's way behind the ring and loosen everything, as well as expand the piston assisting with breaking the carbon up. The grooves are clean now, and the new rings are installed and quite free. Rod's have new ARP's installed and have been reconditioned as well.
I've experienced this on many rebuilds I've done in the past. It happens....and the pistons are fine, as are the cylinders which are now sitting happily with less than .001 of variation...no taper really and no out of roundness. Cylinder bores were all good lingering around 3.190". Motor going back together tomorrow.
Originally Posted by HiProfile
Seriously toss that pot out, or clean it with some harsh abrasive chemicals. Although its stainless, reminant hydorcarbons are not something you want in your brats or spagetti.
Good alternate use of cookware though
Yeah, it's a cheap *** pot that is a real thin material. It wasn't a pot we used. Good for searchers and readers to know though that I didn't mention....don't reuse the pot
Re: How to free stuck piston rings? Make piston stew!! (Runnerdown)
Yep....had stuck rings, then I ran into stuck *** rod bearing caps. I pressed the new ARP's, then took the rods to be recon'd...well I guess it distored the cap some before they were resized. The caps were a ***** as well.
No easy trick in removing those. I don't often do the stock rod/arp combo, so I haven't come across this much. Prior times I've had them, they came off like stock. This time I took a mallet, loosened the rod bolts to where only a couple of threads were engaged, then held the rod with a couple fingers through the big end. I then tapped back and forth quickly on each rod bolt, and they came apart.
I inside mic'd them already, but I like to do a plastigauge anyway as backup. So that's next here today. Have to see what happens on that one.
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