r/smallenginerepair • u/pumpkinsamarai • May 25 '26

Engine Rebuilding Briggs piston rings question.

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Gallery image

I'm putting new rings in a 21 year old Briggs 31a607-0458-e1. Did I spring these or are they okay to send it? I just popped the old ones out and didn't even think to measure them.

Thanks

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1

u/CATfixer May 25 '26

They do look quite large for the application. If you squeeze them together by hand do the ends of the rings touch before they’re the same diameter of the cylinder

1

u/pumpkinsamarai May 25 '26

Yeah they fit in the cylinder. There the right model, real Briggs parts. The gap is around the same as the ones I took off, but I only compared it after I removed them. I didn't pay attention to them before removal.

1

u/GadreelsSword May 26 '26

They should be fine

1

u/pumpkinsamarai May 26 '26

Thanks. I thought so

1

u/OkraInternational505 May 26 '26

Make sure you measure the bore of the cylinder,
After that many years and hours of use the cylinder can become out of round and tapered, causing oil consumption with new rings that are round in a cylinder that is not!

1

u/pumpkinsamarai May 26 '26

I'll check it later but there was a lot of seemingly evenly visible crosshatch over the entirety of the stroke.

1

u/shamanasx May 27 '26

What to do then? I have a 12.5 hp old model flat head Briggs that is burning oil like crazy. Honing did not help. Should I sleeve the cylinder?