The best way to soak and clean piston rings in your engine [SOLVED]

Would it be safe to add Sea Foam directly into each cylinder through the spark plug holes to soak piston rings?

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Jim D.
Jim D.
2 years ago

Thanks for the question Robert. Yes, it is safe to add Sea Foam through a spark plug hole. Mechanics have used this method for decades to free stuck rings and clogged expander rings. How to do it:  Remove the spark plugs and pour Sea Foam into each cylinder cavity through the plug hole. [Note that it’s easier to use Sea Foam Spray.]  Let the engine sit and soak up to 3 days (if you have the time). Be sure to crank the engine once a day to loosen the rings. You can also add a little more Sea Foam to each cylinder each day as it sits. Adding Sea Foam to the crankcase oil helps, too!

Brian Carter
Brian Carter
2 years ago

Last year I used Sea Foam in my ’81 Honda 500 Enduro after a cylinder lost compression. I let is soak for a few hours and my compression came back. Rode it all summer. It sat over the winter and lost compression again. Now I’m taking my time with it and letting it soak longer. After 24 hours it’s already working better! I’m going to give it a good multi-day soak, cranking the engine daily like Jim said. I expect that will at least get me through the summer. It’s good stuff. It works.

Jim D.
Jim D.
2 years ago
Reply to  Brian Carter

Great news, Brian. Sounds like you might have stuck rings. Can try Sea Foam Spray through the air intake, too!

Norm Hopfensperger
Norm Hopfensperger
1 year ago

I have an awesome engine, don’t want to lose it, rebuilt several years ago, alot of $ spent then, want to finish up now. I have already used pb40, any other suggestions, I have heard of atf working.

Brian Miller
Admin
1 year ago

If you’re asking about what to use for soaking stuck rings, tough to beat Sea Foam Spray!

August
August
10 months ago

Is there a ideal temperature range to perform this procedure. I do not have a heated garage and it is winter here. Temps are ranging from the 60’s to the 20’s.

Conner Kranz
Admin
Conner Kranz
10 months ago
Reply to  August

Hi August – that temperature range is fine.

August
August
9 months ago

Thanks.

Sebastian
Sebastian
8 months ago

Do you have to change the oil after soaking the cylinder?

Conner Kranz
Admin
Conner Kranz
8 months ago
Reply to  Sebastian

It wouldn’t be necessary to change the engine oil, since not much Sea Foam is going to leak past the piston rings. (Note:
if your engine has problems with compression caused by stuck piston rings, it might be a good idea to change the oil anyways.)

Amber Gargus
Amber Gargus
8 months ago

I did the Sea Foam method for stuck rings. Any tricks for getting the little bit of the Sea Foam out of my cylinders before I put my plugs back in?

Conner Kranz
Admin
Conner Kranz
8 months ago
Reply to  Amber Gargus

Hi Amber – to remove any remaining Sea Foam in the cylinders, turn the engine over without the spark plugs installed and let the Sea Foam “blow” out (may make a mess). If there is a lot of excessive product in the cylinders, probably best to get as much out as you can. Otherwise, no need to remove it, as the Sea Foam will simply burn up once the engine is started.

Jul Plo
Jul Plo
7 months ago

Carbon build up gets diluted, but how does it go out of the engine?

Conner Kranz
Admin
Conner Kranz
7 months ago
Reply to  Jul Plo

Hi Jul. Here’s what Richard, our tech director, said in response to your question: “Whatever contaminates get dissolved by the Sea Foam being in the cylinders will get burned up by the normal combustion process once the engine is started back up again(will smoke heavily for the first few minutes).”

Brian
Brian
6 months ago

Hey! I was wondering how many seconds I should spray sea foam into a cylinder before letting it soak for 24-72 hours.

Conner Kranz
Admin
Conner Kranz
6 months ago
Reply to  Brian

Good question, Brian. You can spray for about 3 seconds in each cylinder.

Bill
Bill
6 months ago

One person asked how to get excess Sea Foam out of the cylinder before starting. My suggestion is turn the engine over by hand, using a breaker bar and socket on the crankcase bolt. After this, put the spark plugs in finger tight only, to cause some compression. The compression will push the Sea Foam into the rings, which is where you want it to go in the first place. Do this after the first 5 minutes of letting the Sea Foam soak into the rings. Then let it soak for another 30 minutes for the average car which runs ok to sluggish.
I do this every time I change spark plugs. For stuck rings, do the same procedure, but let it soak much longer before trying to turn the engine. Turn the breaker bar back and fourth slightly until you get easier movement. Then only turn in the normal operating direction.
After all the successful work, use top cylinder oil in the fuel on a regular basis, or add Sea Foam to the oil, which has some lubricant in it.

Conner Kranz
Admin
Conner Kranz
6 months ago
Reply to  Bill

Thanks for the comment, Bill! One additional note: from a product formula perspective, you’ll want to let it soak for longer than 30 minutes (3 days even). That will give it time to get the most out of the Sea Foam.

Thanks again!

Dusty
Dusty
4 months ago

Using the liquid motor treatment instead of the spray, how much do you add to each cylinder?

Conner Kranz
Admin
Conner Kranz
4 months ago
Reply to  Dusty

I would recommend using about a 1/4 ounce of Sea Foam Motor Treatment or High Mileage per cylinder. If you have concerns that the piston rings are stuck to the cylinder walls, leave Sea Foam in each cylinder for 24-48 hours and attempt to turn over by hand before attempting to start the engine with the starter.

Rory
Rory
1 month ago

Any tips on trying this on a Subaru. Could it be added through the fuel injector port ?

Conner Kranz
Admin
Conner Kranz
1 month ago
Reply to  Rory

Possibly. Guessing the reason that you want to use the injector port is because the injector port is on the top of the motor(easy to access) and the spark plug is on the side(very difficult to access). However, the injector port is on the back side of the intake valve on port fuel injection engines. Therefore, only one intake valve is open at a time. On GDI Subaru engines, 2019 and newer, yes it would work to introduce Sea Foam to the pistons. I’d suggest using Sea Foam Spray and going through the spark plug holes with Sea Foam Spray.