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Disassembly And Inspection

Typically, a cylinder will have been removed for repair due to either external or internal leakage. Close inspection of the parts of the cylinder after disassembly, particularly the seals, can reveal problems that may not otherwise be obvious.

Piston seal - If the piston seal is badly distorted, eroded or missing completely, this indicates that the barrel is oversize or has bulged in service. In this case, the barrel or the complete cylinder should be replaced. Replacing the piston seal without replacing the barrel is a short-term fix only.

Rod seal - If the rod seal is badly distorted, this usually indicates that either the guide bush is excessively worn or the rod is bent. In both cases this results in the weight of the rod riding on the seal, which causes it to fail. Replacing the rod seal without identifying and rectifying the cause of the problem is a short-term fix only.

Rod - Check the rod for cracks at all points where its cross-section changes. Dye penetrate is ideal for this purpose. It is easy to use and readily available from industrial hardware merchants.

Inspect the chrome surface of the rod. If the chrome looks dull on one side and polished on the opposite side, this indicates that the rod is bent. Rod straightness should always be checked when a cylinder is being repaired. This is done by placing the rod on rollers and measuring the run-out with a dial gauge.

Cylinder/Barrel  - Inspect for heavy scoring, bulging. Deglaze all cylinders prior to reassemble to help ensure proper sealing.

Make sure the adaptors are not leaking that screw into the cylinder making it look like the cylinder is leaking.