Hombre XS Space Cab L4-2.2L CPC (1997)
Valve Seat: Testing and Inspection
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The valves must seat perfectly for the engine to deliver optimum power and performance.
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Cooling the valve heads is another important factor. Good contact between each valve and its seat in the cylinder head is necessary to insure that
the heat in the valve head is properly carried away.
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Regardless of what type of equipment is used, it is essential that the valve guide bores are free from carbon or dirt to ensure the proper centering of
the pilot in the guide.
The valve seats should be concentric to within 0.05 mm (0.031 inch) total indicator reading.
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Reface pitted valves on a valve refacing machine in order to insure the correct relationship between the head and the stem.
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Replace the valve stems that show excessive wear or are warped.
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Replace the valve if the edge of the head is less than 0.79 mm (0.031 inch) thick after grinding.
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Several different types of equipment are available for reconditioning valves and valve seats. Use the manufacturers recommendations of equipment
to attain the proper results.
