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Old 02-21-2014, 12:18 PM
Quagmire Quagmire is offline
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Join Date: Aug 2010
Location: PA
Posts: 30
Default Ring end gap

I got a 12.5hp flat head Briggs with a cast iron sleeve. I didn't want to put much money in the mower as it's getting old so I just thought I'd rering it, cut the seats and grind the valves. I've been boring cylinders for many years in my shop but never much Briggs stuff. So I put it in the tank and went about tweeking it as little as possible. I didn't know where to measure the piston on the skirt so I just went off the bottom. I stopped at around .0065. should work but loose. I figured I'd just get a set of std rings and "hope" the ring gaps wouldn't be too far out. I get the new rings and the oil ring has been updated, it's now a spring and a cast ring around it, so the factory manual the dealer had was no help at that point with end gap. What I can't figure, being that it's now got .0065 skirt clearance now, I figure new it probably had somewhere around .003 on it so how could I now with the new rings have gaps #1 at.015, #2 .018 ? I can live with those but the new updated oil ring has only .010 on it ? How can this be ? I if anything it should be out of specs. I called the co. and all they can give me is a reject size ? Ring end gaps are not wear points ? The only thing that can make it get bigger is a bigger bore or grinding it bigger. So I have no minimum to work with here. IMO .010 on a cast air cooled one piece ring in a roughly 3.5" bore is asking for trouble. I'm thinking it should be at least .015. So can anyone tell me just why there are no min specs ? and any opinions on just how much is asking for trouble ? If not I'm going to grind it out to .015 and call it good.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

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