New Exhaust Valve Has Improved Three-Piece Construction
Usage:
1673 (74B, 78B, 83B) Truck Engines;
D346, D348, D349, D353, D379, D398, D399 Engines In All Applications
Description of Change: A new exhaust valve is used in the above engines. The new valve has a three-piece construction in comparison with the two-piece construction of the former valve. The stem of the new valve is not changed, but the valve head is now made of a special steel with a stellite face for the valve seat. Formerly, the complete head of the valve was a stellite casting. The new design has wear and seat face characteristics similar to the former design, but is not as easily damaged during storage and installation.
Adaptable As: Direct replacement as shown in the chart.
Caterpillar Information System:
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