Econoline E150 1/2 Ton V8-5.4L CNG VIN M (1998)
Valve Seat: Testing and Inspection
Width
1. Measure the valve seat width. If necessary, grind the valve seat to specification.
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Measure the intake valve seat width.
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Measure the exhaust valve seat width.
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Recheck the valve spring installed length after the seats have been ground, and shim the valve springs as necessary to achieve the correct
installed spring length.
