How many kilometers for adjusting valves on Cummins 3.8?

1 Answers
AdrianDella
07/30/25 7:33am
Cummins 3.8 requires valve adjustment every 50,000 kilometers. "Double-row non-entry method": Starting from the fan side (which is generally considered the front end of the engine), the typical firing order is 1-3-4-2. You can actually observe the valve opening sequence by rotating the crankshaft to determine the firing order... Then use the legendary "double-row non-entry method". This method is simple, requires the least number of crankshaft rotations, and is therefore the most efficient. For double-row non-entry: adjust both valves when marked "double", adjust only the exhaust valve when marked "row", adjust neither when marked "non", and adjust only the intake valve when marked "entry". Use a feeler gauge with actual adjustment clearances of: intake valve 0.10~0.15mm, exhaust valve 0.15~0.20mm. Rotating the piston: Turn the first cylinder to top dead center (the first cylinder is counted from the fan side), then adjust half of the valves' clearance using the double-row non-entry method. One full rotation: After rotating the crankshaft one full revolution, adjust the last cylinder to compression stroke top dead center, then use the double-row method to adjust the remaining half of the valves' clearance.
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