How to Adjust Valve Clearance in Diesel Engines?

[SanHenry]

For a four-cylinder engine with a firing order of 1-3-4-2, all valve clearances can be adjusted by rotating the crankshaft twice. The specific steps are as follows: 1. Open the cylinder head cover and rotate the crankshaft while observing the valve movement of cylinder 4. When the intake and exhaust valves exhibit overlapping movement, it indicates the exhaust top dead center (TDC) of cylinder 4, at which point cylinder 1 is at compression TDC. 2. At this position, you can adjust the intake and exhaust valves of cylinder 1, the intake valve of cylinder 2, and the exhaust valve of cylinder 3, as these valves are completely closed. 3. Then rotate the crankshaft 360 degrees to locate the compression TDC of cylinder 4 using the same method, and adjust the remaining valves. This is the simplest and most practical approach, as most multi-cylinder engines can complete all valve adjustments in two rotations.