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excessive piston to bore clearance means that the gap (tollerance) between your piston and the sidewall of your cylinder/block is too large. usually will cause blow-by. the burning of oil, and dark exhaust smoke. also may cause the engine to have a weak compression stroke

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16y ago

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How you can masure the piston ring side clearance?

To measure the piston ring side clearance, first, install the piston ring onto the piston and place them in the cylinder bore. Use a feeler gauge to measure the gap between the ends of the ring when it is positioned in the bore. The thickness of the feeler gauge that fits snugly in the gap indicates the side clearance. Ensure that the measurements are taken at multiple points for accuracy, as the clearance can vary due to wear or manufacturing tolerances.


How is the piston to bore clearance measured in an engine that is being rebuilt?

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What is normally used to maintain the correct piston-to-cylinder clearance?

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What is acceptable clearance of piston wall and cylinder bore?

Acceptable clearance between the piston wall and cylinder bore typically ranges from 0.001 to 0.005 inches (0.025 to 0.127 mm) for most engines, though this can vary based on engine design and materials. Factors such as operating temperature, engine type, and performance requirements can influence the ideal clearance. It's essential to refer to the manufacturer's specifications for the specific engine to ensure optimal performance and longevity. Proper clearance helps minimize friction while allowing for thermal expansion.


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