Sounds like a problem in older wet sleeve engines called hydraulisis. The sleeves actually strech and contract when the cylinder is in the Power Stroke. When expanded on the rod thrust side the sleeve pushes coolent away, when it contracts it causes a void and air bubbles form on the sleeve. When the power stroke occurs again the air bubbles explode working simular to a water jet cutter. Anyone who has ever rebuilt wet sleeve engines has seen this pitting on one side of sleeves. Todays modern engines now support the sleeve midway down rather than the bottom to reduce this problem. O ring deteriation is a result of movement of the sleeve base grinding sediment between the block gland, O ring, and the sleeve. This lower sleeve movment could also cause the top sleeve gland to crack on some engines. Coolent filters and chemical treatments were developed to reduce this phenom.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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