Top Narrowing

• If the contact area is too high on the valve, or if it is too wide, use the 15° cutter to lower and narrow the contact area.

FINAL SEAT CUT

• If the contact area is too low or too narrow, use the 45° cutter to raise and widen the contact area.

NOTE:

After cutting the 15° angle, it is possible that the valve seat (45°) is too narrow. If so, re-cut the valve seat to the correct width.

• After the desired seat position and width is achieved, use the 45°cutter very lightly to clean up any burrs caused by the previous cutting operations,

Do not use lapping compound after the final cut is made. The finished valve seat should have a velvety smooth finish but not a highly polished or shiny finish. This will provide a soft surface for the final seating of the valve which will occur during the first few seconds of engine operation.

NOTE:

After servicing the valve seats, be sure to check the valve clearance after the cylinder head has been reinstalled, (tIT 2-4)

Contact area too low and too

Contact area too low and too

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