SINOTRUK HOWO WEICHAI WD615 ENGINE Exhaust Valve VG1560050041 Intake Valve VG1560050042

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SINOTRUK HOWO WEICHAI WD615 ENGINE Exhaust Valve VG1560050041 Intake Valve VG1560050042

VG1560050041: Exhaust Valve
Installation Location: At the exhaust port within the cylinder head.
Function: Opens during the engine's exhaust stroke, allowing high-temperature combustion gases to rapidly exit the cylinder; closes tightly during the compression and power strokes, maintaining a perfect seal against the valve seat to prevent cylinder leakage.

VG1560050042: Intake Valve
Installation Location: At the intake port within the cylinder head.
Function: Opens during the engine's intake stroke, allowing fresh air (or the air-fuel mixture) to flow smoothly into the cylinder; closes during other strokes, maintaining high pressure within the cylinder to ensure combustion efficiency.

Maintenance and Assembly Precautions
1. Valve Lapping is Mandatory: Valve lapping compound must be used to manually or mechanically grind the valve against its corresponding seat in the cylinder head. This process must continue until a uniform, continuous, dull-silver contact band appears on the valve's working face, ensuring a perfect seal. Failure to achieve a proper seal will result in insufficient cylinder pressure, starting difficulties, black exhaust smoke, and a loss of engine power.
2. Precise Valve Clearance Adjustment: Following assembly, the cold valve clearance at the rocker arm must be precisely adjusted using a feeler gauge in accordance with WD615 engine technical specifications. Excessive clearance causes knocking noises and restricts intake and exhaust flow; insufficient clearance prevents the valves from closing tightly as they expand due to heat, potentially leading to catastrophic mechanical failure, such as the valve striking the piston.
3. Simultaneous Replacement of Associated Seals: When replacing valves, the valve guides, valve springs (VG1500050001/0002), and valve stem oil seals must also be replaced. If an oil seal ages and leaks, engine oil can flow down the valve stem into the combustion chamber, causing severe oil consumption.

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