How to free a stuck piston ring

oldsofb

Royal Smart Person
Supporting Member
Dec 7, 2007
1,253
113
Maryland
Hopefully thy didn’t align the rings improperly.
The compression rings will rotate on the piston as its running. Even if you line the gaps up together (still not what you should do) they'll move around at different rates each. I heard of that being tested and been found that they would do 1 rotation per minute at 1000 rpm. Hopefully they're just stuck in the ring land and a soak will free them up.

Hutch
 
  • Like
Reactions: 2 users
Oct 14, 2008
8,326
113
Melville,Saskatchewan
Kleenflo Combustion Chamber Cleaner. I have gained as much as 30 psi. All the other stuff did nothing. You pull the plug and fill the cylinder and let sit overnight at least, longer if possible. Crank a couple of times and put the plug back in and run. Hopefully you can find it there.
 
  • Winner
Reactions: 1 user

CopperNick

Royal Smart Person
Supporting Member
Feb 20, 2018
2,407
113
Canada
Hmh. Kleenflo, y'say, Combustion Chamber Cleaner, y'say. I might have to ask my local supplier about the stuff, maybe feed a pint or two to my lawn mower. Snigger, snigger, the bugs are on strike in my back yard for better working conditions.


Nick
 
  • Like
Reactions: 1 users

abbey castro

G-Body Guru
Oct 31, 2015
806
93
Harker Hts TX
I used straight ATF in thru the plug hole to the top then replaced plug and let it sit for a week. Did all 6 cyl. It worked on a 170 Ford six that had been siting for years and we couldn't turn it at all.
 
  • Like
Reactions: 1 user

Bonnewagon

Geezer
Sep 18, 2009
9,037
113
Queens, NY
I vote the ATF/acetone mix as It worked for me. Honestly if you give it enough time any old oil will work. But ATF is the champeen at loosening rusty stuff.
 
  • Like
Reactions: 1 users

WanaBa442

G-Body Guru
Aug 5, 2017
513
93
New England
I vote the ATF/acetone mix as It worked for me. Honestly if you give it enough time any old oil will work. But ATF is the champeen at loosening rusty stuff.
ATF/Acetone @ 50/50 mix is the go to for loosening up stuck snowmobile engines for years.
Or Corvair engines too for that matter.
 

64nailhead

Goat Herder
Supporting Member
Dec 1, 2014
5,124
113
Upstate NY
Alright, plow buggy has a dead hole. #1 only shows 50psi. 95-105 for the rest. Supposedly had rings done prior to me buying it, had not been started. I have no idea how long it sat with brand new rings not running. I'm guessing stuck ring, gonna try any tricks I can before pulling it apart. It can't be THAT stuck. Of course it could be a cylinder wall issue, but let's hope it's not.

My plan was to fill the cylinder (at bdc) with a 50/50 mix of ATF and acetone tomorrow, and leave it for 2 weeks (because I fly to work for 2 weeks Wednesday morning.) Then assess it when I get back.

What do you think? Any other ideas? I'm all ears.
Be advised that stuck rings on a cylinder aren't why this isn't running. A V8 will start on 3 cylinders.

Why doesn't it run/start?
 

Dayzedandkonfuzed

G-Body Guru
Thread starter
Feb 9, 2010
969
93
Anglemont, BC
Be advised that stuck rings on a cylinder aren't why this isn't running. A V8 will start on 3 cylinders.

Why doesn't it run/start?

You're absolutely right, except this is a 4 cylinder, but it should still run on 3. I just halted all work once I discovered this. I have been chasing a plethora of issues as to why it wont start. I love taking on other peoples half-finished projects.
 
  • Like
Reactions: 1 user

GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.

Please support GBodyForum Sponsors

Classic Truck Consoles Dixie Restoration Depot UMI Performance

Contact Admin@GBodyForum.com for info on becoming a sponsor