Jun/Jul 2008

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Smokstak

Controlling Oil Rings

By Harry Matthews

Arecent topic on the EnginAds SmokStak bulletin board at http://www.smokstak.com/ involved seating new piston rings in old engines. The thread's head? Expert Advice Needed.

I just rebuilt the engine in my 1914 12-25 Avery. The sleeves are new and I re-grooved the pistons for new, over-width step-cut rings. I also installed new wrist pin bushings, new valve stems and guides, everything. But I have a problem: The rings will not seat, and it's pumping oil like a pig even though it runs like a Swiss watch.

I started with 20/50 weight oil, switched to 10 weight non-detergent, and now straight 50 weight. I don't have the pulley mounted, but when I press a plank against the flywheel it clears right up. I've resigned myself to the fact that it's just going to take a long, heavy load to do the trick. Does anyone know of an...

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