Product Features

• Structure: Forged from high-strength alloy steel with precision-machined contact surfaces and roller bearings at the valve end. The assembly includes a pivot shaft and mounting hardware for secure installation.

• Performance: Withstands high dynamic loads and temperatures up to 300°C, ensuring precise and reliable actuation of the engine’s intake and exhaust valves. The roller bearing design reduces friction and wear, extending service life.

• Design: Precision-engineered to match the original valve train geometry, ensuring accurate valve lift and timing for optimal engine performance.

Core Function

• Transmits the camshaft’s rotational motion into linear motion to open and close the engine’s intake and exhaust valves.

• Maintains precise valve timing and lift, ensuring efficient air-fuel mixture intake and exhaust gas evacuation.

• The roller bearing design minimizes friction and wear, reducing engine noise and improving fuel efficiency.

Rock Arm 201-04200-6057 for SINOTRUK – Precision-Engineered Valve Train Component

When your SINOTRUK engine demands unwavering valve timing accuracy under extreme loads, the Rock Arm 201-04200-6057 delivers exactly that. Engineered to OEM specifications, this rocker arm transfers camshaft motion to the intake and exhaust valves with consistent precision — keeping combustion efficiency high and fuel waste low across hundreds of thousands of kilometers. METTLEAD Truck Parts supplies this critical valve train component directly from our quality-controlled production line in China, giving fleet operators and distributors worldwide access to factory-direct pricing without compromising on metallurgical integrity or dimensional accuracy.

Key Functions and Buyer Benefits

Engineered for Demanding Duty Cycles

The Rock Arm 201-04200-6057 sits at the heart of the SINOTRUK engine’s valve actuation system. It pivots on the rocker shaft, receiving lift from the camshaft pushrod and translating that motion into precise valve opening and closing events. Every combustion cycle depends on this component performing within tight tolerances.

• High-Fatigue Resistance: Manufactured from forged alloy steel with controlled heat treatment, this rocker arm withstands millions of cyclic stress events without micro-cracking or deformation.
• Precision Contact Surfaces: The cam-contact pad and valve tip interface are ground to a surface finish that minimizes friction losses and reduces abnormal wear patterns on mating components.
• Exact OEM Dimensional Match: Bore diameter, arm length, and pivot geometry replicate the original SINOTRUK specification, ensuring drop-in fitment with zero modification required.
• Optimized Weight Distribution: Balanced mass reduces inertial loads at high RPM, protecting the valve springs and camshaft lobes from premature fatigue.
• Cost Efficiency at Scale: Factory-direct supply from METTLEAD eliminates intermediary markups — a critical advantage for procurement managers sourcing replacement parts in volume.

What This Means for Your Operation

A worn or substandard rocker arm introduces valve timing drift, leading to incomplete combustion, elevated exhaust temperatures, and accelerated wear on valve seats and guides. By specifying the 201-04200-6057 from METTLEAD, you protect the broader engine system while maintaining fuel economy targets and emission compliance across your fleet.

Technical Specifications

Application and Vehicle Fitment

The Rock Arm 201-04200-6057 is designed to serve the valve train assembly in SINOTRUK heavy-duty diesel engines. You will find this part working reliably in the following real-world scenarios:

• SINOTRUK HOWO A7 / T7H Long-Haul Tractors: Covering intercity freight corridors where engines sustain high-load operation for 10+ hours daily.
• SINOTRUK SITRAK C7H Premium Logistics Trucks: Supporting the MC11/MC13 engine platform in demanding express logistics and cold-chain transport applications.
• SINOTRUK HOWO Heavy-Duty Dump Trucks: Operating in mining and construction environments where engine vibration and thermal cycling are extreme.
• SINOTRUK Concrete Mixer and Special-Purpose Chassis: Enduring continuous PTO-driven loads that place additional stress on valve train components.

If your fleet runs any SINOTRUK platform equipped with the MC or D-series engine family referencing part number 201-04200-6057, this rocker arm is your direct replacement solution. For cross-reference verification against your specific engine serial number, our technical team is ready to assist.

OEM and ODM Capability

White-Label and Custom Packaging

METTLEAD understands that distributors and regional wholesalers often need parts delivered under their own brand identity. We offer full white-label service for the Rock Arm 201-04200-6057 and our entire SINOTRUK truck parts catalog:

• Custom Branding: Your logo, part number scheme, and brand colors printed on packaging and labels.
• Tailored Packaging Formats: Individual retail boxes, bulk industrial cartons, or mixed-SKU pallets configured to your warehouse requirements.
• Private Documentation: Installation guides and spec sheets formatted under your brand for end-customer distribution.

Strict Quality Control Pipeline

Every Rock Arm 201-04200-6057 leaving our facility passes through a multi-stage inspection protocol:

1. Raw material composition verification via spectrometry.
2. Post-forging dimensional inspection using CMM (Coordinate Measuring Machine).
3. Heat treatment hardness validation — batch sampling at HRC scale.
4. Final visual and functional inspection before packaging.

This process ensures that whether you order 50 pieces or 5,000, every unit meets the same exacting standard your customers expect.

Frequently Asked Questions

What causes a Rock Arm 201-04200-6057 to fail prematurely?

The most common failure modes for this rocker arm include insufficient lubrication reaching the pivot bore (often due to clogged oil galleries), excessive valve lash that creates impact loading on the contact pad, and contaminated engine oil introducing abrasive particles to the bearing surfaces. Regular oil analysis and valve lash adjustment at manufacturer-recommended intervals significantly extend service life.

How do I verify that 201-04200-6057 is the correct part number for my engine?

Cross-reference the number stamped on your existing rocker arm or consult your SINOTRUK engine parts manual under the valve train assembly section. If you provide your engine model and serial number, our technical team can confirm fitment before you place an order.

Is this Rock Arm sold individually or as a set?

The Rock Arm 201-04200-6057 is priced and sold per piece. However, since engines typically use multiple rocker arms (one per valve), we recommend replacing all rocker arms on a given cylinder head simultaneously to maintain uniform wear characteristics. Volume pricing is available for full-engine sets.

What is the expected service life of this rocker arm under normal operating conditions?

Under proper lubrication and correct valve lash settings, the 201-04200-6057 rocker arm is designed to match the engine’s major overhaul interval — typically 400,000 to 600,000 km for SINOTRUK heavy-duty diesel applications. Severe-duty operations (mining, continuous heavy load) may require inspection at shorter intervals.

Can METTLEAD supply other valve train components alongside this rocker arm?

Yes. We stock the complete valve train system for SINOTRUK engines — including rocker shafts, pushrods, valve bridges, valve springs, and camshaft assemblies. Bundling related components in a single shipment reduces your logistics cost and ensures all mating parts share the same quality standard. Browse our full SINOTRUK parts range for details.

Secure Your Supply — Request a Quote Today

Procurement timelines matter. Whether you need 20 pieces for urgent maintenance stock or 2,000 units for regional distribution, METTLEAD delivers the Rock Arm 201-04200-6057 with competitive factory-direct pricing, flexible payment terms, and reliable shipping to your port or warehouse.

Your next step is simple:

• Tell us your required quantity and delivery destination.
• Receive a detailed quotation within 24 hours.
• Confirm your order and we handle the rest — from quality inspection to export documentation.

Contact us now
to lock in pricing and lead time for the Rock Arm 201-04200-6057. Our sales engineers are standing by to support your procurement process from inquiry through delivery.