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piston-bore-measurement.jpg | Hits: 4923 | Posted on: 1/2/05
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Measure the cylinder bore and select the piston to ensure the proper clearance. When the bore diameter is in the lower one-third of the specified range, a red piston should be used. When the bore diameter is in the middle one-third, a blue piston should be used. When the bore diameter is in the upper one-third, a yellow piston should be used.
NOTE: Cylinder bore must be clean and dry, and engine block must remain at room temperature (21°C/70°F) for eight hours before taking cylinder measurements.
Measure the piston diameter to ensure the specified clearance is obtained. It may be necessary periodically to use another piston (within the same grade size) that is either slightly larger or smaller to achieve the specified clearance.
If none can be fitted, refinish the cylinder to provide the proper clearance for the piston.
When a piston has been fitted, mark it for assembly in the cylinder to which it was fitted.
If the taper, out-of-round and piston-to-cylinder bore clearance conditions of the cylinder bore are within specified limits, new piston rings will give satisfactory performance.
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