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Old 10-16-2008, 08:16 PM   #1 (permalink)
dtreid
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Stuck Piston Rings?

Just wondering if my low compression in 1 cyl problem could be stuck piston rings?
The engine apparently sat out of the truck in the guys garage for close to a year, probably laying on one side. Could this have led to a stuck ring?
If so, is there a remedy?

I've heard that you could pour some diesel directly into the cylinder and leave it sit for awhile. I want to try something without disassembling the engine. Any other ideas?
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Old 10-17-2008, 02:35 PM   #2 (permalink)
weik
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I've heard ATF works as well.
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Old 10-17-2008, 03:03 PM   #3 (permalink)
4doorTAHOE6.5TD
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IIRC GM manuals have a remedy to try for stuck piston rings. Personally if the engine I would use PB Blaster to disolve suspected crud from water or whatever itwas exposed. Testing for Cylinder leak Down rate is more informational than compression lb. test alone. One could check for ongoing improvement or detioration. Only involves removing the one glow plug & bringing the piston to TDC or & Bottom center.
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Old 10-17-2008, 08:39 PM   #4 (permalink)
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I was reading about putting 'marvel mystery oil' in the cyl.

Another site mentioned mixing equal parts of ATF, kerosene, and wd-40 together.

Has anyone heard of these methods? Would I just pull an injector, shoot some stuff in and let it sit for a week or so?
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Old 10-17-2008, 08:44 PM   #5 (permalink)
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There may be something better out there but PB Blaster works. Freed up a locked up outboard that had been sitting for YEARS. Filled the cylinder and you could rotate the engine the next morning. I'd wager that I didn't really have to wait like 20 hours, but who knows?
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Old 10-17-2008, 09:35 PM   #6 (permalink)
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Here is a final recipe from a man that spent his entire life working on diesels...

Mix 1/2 cup of kerosene, one capful of ATF fluid, and two capfuls of naptha (Zippo lighter fluid). Take out all injectors, and shoot it in the bad cylinder with a turkey baster you never want to use at thanksgiving ever again, with piston at bottom dead center. Twice a day for three days, turn engine back and forth a little with a breaker bar (Not too far or it will come out of injector hole. Then turn engine over by hand completely with a rag over injector hole. Then spin engine with the starter. Then shoot one cup full of Mobil 1 Jet Oil II into cylinder and repeat process. After done, reassemble engine. If it don't work, it either isn't a stuck ring, or it isn't gonna unstick. Don't get the jet oil on your skin, it has tricresylphosphate in it, and doesn't do good things to nerves.
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Old 10-17-2008, 09:49 PM   #7 (permalink)
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Marvel Mystery Oil has done some great things, its only $3 for a quart so you dont have much to lose.
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Old 10-17-2008, 09:56 PM   #8 (permalink)
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Should put a little oil on top the piston and do another compression check just to see if it is rings or not ,at least that way you would have a good idea that it is rings rather then valves or a hole in the piston .
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Old 10-17-2008, 10:03 PM   #9 (permalink)
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I'm gonna bet a beer it isn't rings.
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Old 10-17-2008, 10:04 PM   #10 (permalink)
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Quote:
Originally Posted by dtreid View Post
The engine apparently sat out of the truck in the guys garage for close to a year, probably laying on one side.
Translated...

Either valve stuck, or it burned a hole in a piston. It ran like crap, so they pulled it, probably tore it apart, saw the damage, and put it back together and sold it to you.
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