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Old 01-02-18, 11:06 PM   #1
mkent
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Default Piston rings rusted in grooves

I'm working on a JAP 3 at the moment, have been soaking the piston in solvents of various sorts to try and free the rings off, no luck so far, but a nice clean piston.

The rings have rusted enough to jam them in the grooves, apart from breaking them out, is there any other way to try and free them off?
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Old 01-02-18, 11:10 PM   #2
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Time, and dont rush it, right or wrong the technique I use is to let them soak for days first, rub with a wire brush to try to remove as much rust as possible, then gently tap with the back of the wire brush around the outside, the shock must get things moving as I have done this a few times with success as once you get things moving its just a case of working things back and fore,

If you rush it you will break the rings.

Good luck,

Chris

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Old 01-02-18, 11:41 PM   #3
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A cheap 30 ultrasonic bath will free them up.
Just make sure the max fill level is such the rings will be submerged.

Neil.
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Old 02-02-18, 12:14 AM   #4
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Quote:
Originally Posted by Hornet 6 View Post
A cheap 30 ultrasonic bath will free them up.
Just make sure the max fill level is such the rings will be submerged.

Neil.
I think I need to get one of these ultrasonic baths, any recommendations?.

Stuart.
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Old 02-02-18, 12:50 AM   #5
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If it is an aluminium piston then the coefficient of expansion between the piston and rings will be different. Maybe some heat cycling would help.
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Old 02-02-18, 12:58 AM   #6
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I think I need to get one of these ultrasonic baths, any recommendations?.

Stuart.
Mine is a Maplin's one, bought for cleaning rifle brass about 8 years ago so has stood the test of time.
For general cleaning SeaClean2 is recommended, but you can use many different solutions, just be aware extended operation will slowly warm the bath up, not good indoors if your using something flamable. I often use white spirit for cleaning grease from fishing reel components, fine when you only need to put the best through one 480 second cycle.

Neil.
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Old 02-02-18, 01:11 AM   #7
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Quote:
Originally Posted by Hornet 6 View Post
Mine is a Maplin's one, bought for cleaning rifle brass about 8 years ago so has stood the test of time.
For general cleaning SeaClean2 is recommended, but you can use many different solutions, just be aware extended operation will slowly warm the bath up, not good indoors if your using something flamable. I often use white spirit for cleaning grease from fishing reel components, fine when you only need to put the best through one 480 second cycle.

Neil.
I used to clean my pistol brass in the one at work, they came up a treat

The JPL seaclean2 seems popular.

Most seem to be advertised by capacity in Litres and I think something with a 6" ish cube tank will do so will have to check a few specs.

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Old 02-02-18, 10:55 AM   #8
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Most seem to be advertised by capacity in Litres and I think something with a 6" ish cube tank will do so will have to check a few specs.

Stuart.
That would be a fair bit bigger than mine, which is maybe 6 " x 4 " x 2" deep.
When freeing off the rings for my Maytag I had to resort to putting the piston in a pyrex beaker and standing that in the tank with plain water, actually works well.


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Old 02-02-18, 02:23 PM   #9
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I had a cast iron piston siezed in a cast iron cylinder. Coka Cola and black treacle freed it up a treat,

but then it did take 2 years!

My thoughts are with you

Cheers, Tony.
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Old 02-02-18, 07:07 PM   #10
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Boil it in diesel, just make sure the extractor fan is on in the kitchen, and don't try and boil eggs at the same time as the diesel taints the taste
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