Cylinder Bore
WARNING: This page is about a different variant/trim than selected.
- Use a cylinder bore gauge (2) to correctly measure the inside diameter of the cylinder bore (3). A cylinder bore gauge capable of reading in 0.003 mm (0.0001 in.) increments is required. If a bore gauge is not available, do not use an inside micrometer.
- Measure the inside diameter of the cylinder bore at three levels below the top of the bore (4). Start at the top of the bore, perpendicular (across or at 90°) to the axis of the crankshaft at point A (1).
- Repeat the measurement near the middle of the bore then repeat the measurement near the bottom of the bore.
- Determine the taper by subtracting the smaller diameter from the larger diameter.
- Rotate the measuring device 90° to point B (1) and repeat the three measurements. Verify that the maximum taper is within specifications.
- Determine out-of-roundness by comparing the difference between each measurement.
- If the cylinder bore taper does not exceed 0.0127 mm (0.0005 inch) and out-of-roundness does not exceed 0.008 mm (0.0003 inch) then the cylinder bore can be honed. If the cylinder bore taper or out-of-round condition exceeds the maximum limits, replace the engine block.
NOTE:
A slight amount of taper always exists in the cylinder bore after the engine has been in use for a period of time.