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SINOTRUK MAN MC11 MC13 ENGINE Exhaust Valve Rocker Arm ASSEMBLY 202V04201-6002
Product Functions
1. Precise Exhaust Control: Acting as a central lever mechanism, it receives input from the camshaft to precisely control the opening and closing of the engine's exhaust valves. This ensures the complete expulsion of combustion exhaust gases and directly influences both engine power output and fuel consumption.
2. EVB (Engine Valve Brake) Auxiliary Braking: Equipped with an integrated hydraulic adjustment mechanism, this system allows for the slight opening of exhaust valves-controlled via oil pressure-during long descents or deceleration in heavy-duty trucks. By leveraging the negative pressure generated within the engine, it effectively slows the vehicle down. This more than doubles the engine braking power, significantly reducing brake pad wear and preventing brake failure caused by overheating.
3. High-Speed Anti-Wear and Self-Lubrication: The contact end features a roller-based design, converting sliding friction into rolling friction to minimize energy loss. Additionally, an internal precision oil passage provides pressurized lubrication, ensuring the component remains free from thermal damage (ablation) even when subjected to thousands of high-speed impacts per minute.
Criteria for Determining the Need for Component Replacement
1. Surface spalling or scoring of the roller: If the surface of the roller-which makes contact with the camshaft at the rear of the rocker arm-exhibits visible pitting, spalling, irregular indentations, or severe scratching, it must be replaced.
2. Excessive axial or radial play in the roller: If, when wiggling the roller by hand, the needle bearing feels noticeably loose or prone to sticking, it indicates that the internal needle bearing has suffered wear due to fatigue.
3. Pressure loss or seizing of the EVB hydraulic mechanism: If the braking power of the EVB (Exhaust Valve Brake) system drops significantly during long descents, or if a diagnostic scanner detects intermittent misfires in a cylinder caused by a valve failing to close properly, it is typically due to the internal EVB hydraulic piston becoming worn or seized, or a check valve failing to hold pressure. In such cases, the entire assembly must be replaced.
Valve Rocker Arm & Shaft Assembly (Core Components of the Work Area)
| No. | Part Number / Spec | Part Name | Standard Qty / Vehicle | Key Technical Parameters & Maintenance Notes |
|---|---|---|---|---|
| 1.1 | 202V04201-6002 | Exhaust Valve Rocker Arm Assembly (with Roller/EVB) | 6 pcs | Core Replacement Item. Built-in EVB hydraulic mechanism and needle roller bearing; responsible for exhaust and auxiliary braking. |
| 1.2 | 202V04201-6001 (Synchronized) | Intake Valve Rocker Arm Assembly (with Roller) | 6 pcs | Highly recommended to check/replace simultaneously. Shares the same camshaft and rocker shaft with the exhaust rocker arm; usually wears at a similar rate. |
| 1.3 | 202V04204-0010 (Varies by config) | Valve Rocker Shaft | 2–3 pcs | The central shaft supporting rocker arm rotation. If any scoring or wear ridges are found on the shaft during replacement, it must be replaced to prevent rocker misalignment and oil pressure leaks. |
| 1.4 | MAN Engine Matched | Rocker Shaft Retaining Bolts & Snap Rings | 1 set | High-strength bolts used to secure the rocker shaft, and snap rings used to limit axial movement, preventing misalignment under high-speed operation. |
Valve Actuation & Adjustment Components (Anti-Leakage & Anti-Seizure Safety Components)
| No. | Part Number / Spec | Part Name | Standard Qty / Vehicle | Key Technical Parameters & Maintenance Notes |
|---|---|---|---|---|
| 2.1 | 202V04201-0025 (Reference) | Valve Clearance Adjusting Bolt (with Ball Stud) | 12 pcs | Threaded into the front end of the rocker arm to adjust valve clearance. The ball stud end is a high-frequency impact surface prone to indentation/wear; recommended to replace with new rocker arms. |
| 2.2 | Standard Locknut | Adjusting Bolt Hex Locknut | 12 pcs | Used to lock the valve clearance adjustment. If stripped or reused too many times, it can cause the valve clearance to loosen during vehicle operation. |
| 2.3 | 202V04104-0012 (EVB Matched) | Valve Bridge Assembly | 6 pcs | The component directly pressed by the exhaust rocker arm (one bridge actuates dual valves). Focus on checking the guide surfaces or guide bores for excessive wear, which causes uneven force on valves. |
DETAILS
| DESCRIPTION | Exhaust Valve Rocker Arm ASSEMBLY | PART NUMBER | 202V04201-6002 |
| WEIGHT | 1kg | VOLUME |
185 × 65 × 48 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 |
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