Six-Cylinder Diesel Engine Valve Adjustment Method?
2 Answers
Loosen the lock nut on the intake and exhaust valve adjustment bolt, and insert an appropriate feeler gauge between the rocker arm and the crosshead. Loosen the lock nut on the injector rocker arm, turn in the adjustment bolt until the plunger contacts the injector cup. Back out the adjustment bolt one turn, then use a screwdriver to turn in the adjustment bolt. According to the firing order (1-5-3-6-2-4), continue prying the engine to the next mark point B.
As an experienced mechanic who frequently tinkers with engines, let me share some insights. Adjusting the valves on a six-cylinder diesel engine requires a step-by-step approach—don’t rush it. First, ensure the engine is cooled and stationary for at least half an hour to avoid burns or part deformation. Next, locate the top dead center (TDC) position of the first cylinder, which is the highest point of the compression stroke, achieved by rotating the flywheel. At this stage, only adjust the valve clearance for specific cylinder groups: intake and exhaust valves of cylinders 1, 5, and 3. The standard clearance typically ranges between 0.2 to 0.4 mm, but exact values depend on your diesel engine model—check the manual. Use a feeler gauge to slowly insert into the gap, adjusting the screw until you feel slight resistance, then tighten the lock nut. Rotate the flywheel 180 degrees and adjust the remaining cylinders: 6, 2, and 4. Precision is crucial—too tight risks burning the valve seats, while too loose causes excessive noise and fuel waste. For tools, a wrench and feeler gauge suffice. Beginners unsure of the process can refer to tutorial videos to avoid rework.
