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Orginal HOWO diesel engine exhaust valve VG1560050041,used for sinotruk D10 diesel engine.
6 pcs exhaust valve and 6 pcs intake valve used in one engine.The intake valve part number is VG1560050042.
FUNCTION
1. Exhaust Gas Removal: Opening during the exhaust stroke of the engine's four-stroke cycle, the high-temperature, high-pressure exhaust gas from the cylinder is expelled, making room for the next intake stroke and ensuring continuous, efficient engine operation.
2. Maintaining Cylinder Pressure and Combustion Efficiency: Precisely controlling the timing and opening of the exhaust valve helps achieve optimal residual exhaust gas volume in the cylinder, optimizing the combustion process, improving power output, reducing fuel consumption, and decreasing emissions.
3. Sealing High Cylinder Pressure: When closed during the compression and power strokes, the valve fits tightly against the valve seat, withstanding the high cylinder pressure, preventing gas leakage, and ensuring stable compression ratio and combustion pressure.
4. High Temperature, High Pressure, and Corrosion Resistance: The exhaust valve directly contacts high-temperature exhaust gas and corrosive gases. Nitriding treatment or high-temperature alloy materials maintain the valve surface hardness, sealing performance, and resistance to ablation, preventing valve surface burning, denting, or deformation.
5. Works in conjunction with the valve mechanism: It works with valve springs, valve guides, valve seats, rocker arms, camshafts, etc., and is driven by the camshaft to open/close at a time to achieve engine valve timing control.
Working Principle
Closed State (Compression): The valve spring force + cylinder pressure keeps the exhaust valve tightly against the valve seat, forming a hermetically tight seal. This prevents the air-fuel mixture/combustion gas from leaking into the exhaust manifold and ensures normal cylinder pressure accumulation.
Open State (Exhaust Stroke): The camshaft pushes the rocker arm → the valve stem depresses → overcoming the spring force → the exhaust valve opens. Exhaust gases are then expelled from the cylinder by the upward-moving piston.
Installation location: The exhaust valves are installed on the exhaust port side of the cylinder head (2 per cylinder, 12 in total). Above the combustion chamber of the cylinder head, the exhaust valve disc faces the combustion chamber, the valve stem is inserted into the valve guide, and the end of the valve stem engages with the valve spring seat and valve lock clip.
Advantages:
1. Excellent high-temperature durability and ablation resistance: The valve disc/cone surface undergoes nitriding treatment, resulting in high surface hardness and resistance to high temperatures, oxidation, and corrosion. Under heavy-load, long-distance, high-temperature environments or with poor-quality fuel, the valve surface is not prone to ablation, denting, or cracking.
2. High thermal expansion matching and stability: The valve stem/valve disc material has an optimized coefficient of thermal expansion, ensuring uniform expansion at high temperatures and preventing valve stem jamming or excessive clearance. Valve operation is smooth and without sticking under high-temperature conditions; precise timing is maintained even after multiple hot and cold cycles, ensuring stable engine operation.
DETAILS
| DESCRIPTION | Exhaust Valve | PART NUMBER | VG1560050041 |
| WEIGHT |
0.3KG |
VOLUME |
Head Diameter 50 mm Stem Diameter 12 mm Overall Length 156 mm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Maintenance Schedule (Recommended Reference) for VG1560050041 (Exhaust Valve)
| Maintenance Item | Recommended Interval | Operation Content & Standards |
|---|---|---|
| Daily Visual + Engine Performance Observation | Before each departure / Daily | Observe if the engine produces black smoke, loss of power, abnormal noise ("ticking" valve sound), or starting difficulty; listen for smooth idle; note if exhaust temperature is abnormally high (indirect indication of valve sealing issues) |
| Valve Clearance Check & Adjustment | Every 20,000–30,000 km or quarterly | With engine cold, measure valve clearance using feeler gauge (exhaust valve standard 0.35–0.40 mm); adjust rocker arm nut to ensure correct clearance, preventing excessive gap (leakage) or insufficient gap (valve burning) |
| Compression Pressure Test | Every 50,000–100,000 km or when power loss is noticeable | Use a cylinder pressure gauge to test compression pressure in each cylinder (standard 28–32 bar); if any cylinder is 20% or more below average, suspect valve leakage or burning, and proceed to cylinder head inspection |
| Comprehensive Inspection during Engine Overhaul | Every 300,000–500,000 km or during engine major overhaul | Remove cylinder head and visually inspect exhaust valve faces for burning, pitting, cracking, or heavy carbon deposits; check valve seat sealing band width (should be uniform, no burn marks); measure valve stem-to-guide clearance (standard 0.05–0.10 mm) |
| Preventive Replacement (Group Replacement) | 300,000–500,000 km or during engine major overhaul | Replace all 12 exhaust valves (or full set of intake + exhaust valves, valve seats, guides, springs, keepers) proactively during engine overhaul, cylinder head removal, or when compression pressure drops significantly, to avoid uneven wear from partial replacement |
| Emergency Inspection (When Abnormal) | Immediately upon symptoms | If black smoke, severe power loss, valve noise, or starting issues appear, perform compression test + valve clearance check immediately; if valve-related, stop operation to prevent further damage to cylinder head or pistons |
DETAILES PHOTO:
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