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What is the valve adjustment mnemonic for a 6-cylinder diesel engine?

1 Answers

KayleeLynn

07/29/25 3:07pm

For a six-cylinder diesel engine, the firing order is 1-5-3-6-2-4. When the No. 1 cylinder piston is at top dead center (TDC), you can adjust the intake and exhaust valves of No. 1 cylinder, the exhaust valves of No. 3 and No. 5 cylinders, and the intake valves of No. 2 and No. 4 cylinders. Then, rotate the crankshaft one full turn, and when the No. 6 cylinder piston is at TDC, you can adjust the intake and exhaust valves of No. 6 cylinder, the intake valves of No. 3 and No. 5 cylinders, and the exhaust valves of No. 2 and No. 4 cylinders. Here are some relevant details: 1. Simply put, when rotating the flywheel, observe the pushrods of the intake and exhaust valves of the No. 1 and No. 6 cylinders. You will notice that one cylinder's pushrod remains fully extended while the other does not. When it reaches TDC, it cannot be adjusted further. Generally, the valve clearance for the intake valve of a diesel engine is 0.25-0.30 mm, and for the exhaust valve, it is 0.35-0.40 mm. 2. The valve consists of a valve head and a stem. The valve head operates at very high temperatures (intake valve: 570~670K, exhaust valve: 1050~1200K) and is subjected to gas pressure, valve spring force, and the inertia force of the transmission components. Due to poor lubrication and cooling conditions, the valve must possess sufficient strength, stiffness, heat resistance, and wear resistance. Intake valves are typically made of alloy steel (chromium steel, nickel-chromium steel), while exhaust valves are made of heat-resistant alloys (silicon-chromium steel). Sometimes, to save on heat-resistant alloy materials, the exhaust valve head is made of heat-resistant alloy, and the stem is made of chromium steel, with the two parts welded together.

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