• Measure the flatness of the intake and exhaust
valves. Both valves must be flat within 0.03 mm
[0.001-inch].
NOTE: Cummins Engine Company, Inc. recommends that
new valves be installed.
• Apply a bluing compound to the exhaust valve seat-
ing surface.
• Install the exhaust valve on the valve seating sur-
face and check the seating area. Replace the seat
if the contact area is not 100 percent.
• Measure the exhaust valve seat height.
• If the seat height is less than 12.32 mm [0.485-inch],
replace the seat.
• Apply a ‘‘bluing’’ compound to the intake valve seat-
ing surfaces.
• Install the intake valve on the valve seating surface
and check the seating area. Replace the seat if the
contact area is not 100 percent.
Air Compressor, Cylinder Head (4-06) Section 4 - Compressed Air System
N14Page 4-18
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