Piston Skirt Failure - Only Cub Cadets

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Piston Skirt Failure

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03-16-2020, 12:38 PM

Bob95065

Senior Member

Join Date: Jan 2014

Location: Felton, CA

Posts: 372

Piston Skirt Failure

I picked up a 1650 parts tractor from a Facebook ad that looks like it spent some not so quality time in a mud bog. The engine was seized when I got it.

I took the engine out of the tractor and put it on the bench. I drained the small amount of what looked like crude oil from the crankcase. I removed the head and pan. In the bottom of the pan I found a chunk of aluminum about the size of a quarter that ended up being from the piston skirt. I saw no other obvious signs of damage.

I used a block of 2x4 and a big hammer to persuade the piston down the bore. It got it to BDC and used the block and hammer on a con rod bolt to get it to TDC. Whatever was seized released and the engine spins freely now. The bore looks smooth with faint cross-hatching and no scores or scratches.

What could have caused the piston skirt to fail? Am I safe to start the engine as-is? I want to see if it burns oil or smokes before I buy a standard diameter piston for it. I wanted the engine for another tractor that has developed a smoking habit. I can use this one while I rebuild the other.

Thanks,

Bob

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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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