3803741 3087634 4059302 Piston Assembly STD Size for Cummins N14 Diesel Engine

Product Details

Product Overview

This premium quality piston assembly is a critical component for the Cummins N14 series diesel engines, including the N14 Celect and N14 Celect Plus models. Designed as a two-piece articulated piston, it comprises a forged steel crown (Part No. 3087634) and an aluminum alloy skirt (Part No. 4059302), supplied as a complete kit (Part No. 3803741) in standard size (STD) with a 139.7mm diameter.

Commonly used in heavy-duty trucks, engineering machinery, and generator sets, this piston assembly ensures reliable power output and long service life. The combination of materials—forged steel for the crown and aluminum alloy for the skirt—provides excellent heat resistance and reduced reciprocating mass, making it suitable for high-performance diesel applications.

Each kit is manufactured to meet or exceed OEM specifications, ensuring direct interchangeability with original Cummins components. Whether you are performing a complete overhaul or replacing individual pistons, this assembly offers the precision and durability required for demanding commercial environments.

Key Features & Benefits

• OEM-Equivalent Fitment: Direct replacement for Cummins N14, N14 Celect, and N14 Celect Plus engines with part numbers 3803741, 3087634, and 4059302.
• Two-Piece Articulated Design: Separates thermal and mechanical loads for improved fatigue resistance and reduced piston slap noise during cold starts.
• Forged Steel Crown: Withstands extreme combustion temperatures and pressures, reducing the risk of cracking or crown deformation under heavy load.
• Lightweight Aluminum Skirt: Minimizes reciprocating mass for better fuel economy and reduced bearing loads, extending engine life.
• Standard Size (STD) Precision: Machined to 139.7mm diameter with tight tolerances for minimal cylinder wall clearance, ensuring optimal compression and oil control.
• Complete Kit Convenience: Includes both crown and skirt as a matched set, eliminating compatibility concerns during engine assembly.
• Rigorous Quality Control: Each assembly undergoes dimensional inspection and material verification to ensure consistent performance across all units.

Technical Specifications

OEM Cross-Reference

This piston assembly is a direct replacement for the following OEM and industry-standard part numbers:

• Cummins OEM: 3803741 (Kit), 3087634 (Crown), 4059302 (Skirt)
• Interchangeable with: Competitor part numbers that match these OEM references (verify compatibility with your engine serial number)

Note: Always confirm your engine’s specific configuration (e.g., Celect vs. Celect Plus) to ensure correct piston-to-liner clearance and ring pack compatibility.

Compatibility

This piston assembly is designed for use in the following engines and applications:

• Engine Models: Cummins N14, N14 Celect, N14 Celect Plus
• Common Applications: Heavy-duty trucks (e.g., Freightliner, Kenworth, Peterbilt), engineering machinery (excavators, loaders), and industrial generator sets

Fitment is inferred based on original equipment specifications. Always verify compatibility with your specific engine serial number and cylinder liner dimensions before installation.

Global Supply & Distribution

We offer worldwide shipping with reliable logistics partners to ensure timely delivery to major industrial centers and ports. Our distribution network covers:

• North America: Fast delivery to hubs like Houston, Los Angeles, Chicago, and Toronto for heavy-duty truck and construction equipment markets.
• Europe: Efficient service to Rotterdam, Hamburg, and Antwerp for European OEM and aftermarket distributors.
• Asia-Pacific: Direct shipping from our Guangdong, China facility to Singapore, Tokyo, Sydney, and Shanghai.
• Middle East & Africa: Regular shipments to Dubai, Jeddah, and Johannesburg for mining and oilfield applications.

We maintain export experience with full customs documentation, including commercial invoices, packing lists, and certificates of origin. Customized packing options are available for bulk orders or specific market requirements.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001-certified facilities with strict adherence to OEM specifications for material composition and dimensional tolerances.
• Testing Procedures: Each batch undergoes machinery test reports and video outgoing inspection to verify fitment and performance.
• Warranty: Backed by a 6–12 month warranty or 100,000 kilometers of service, covering manufacturing defects under normal operating conditions.

FAQ

Q: How do I confirm this piston assembly fits my Cummins N14 engine?
A: Verify your engine’s serial number and model designation (N14, N14 Celect, or N14 Celect Plus). This kit is standard size (139.7mm); if your cylinder liners are worn beyond tolerances, you may need oversized pistons or liner replacement. Always measure liner bore before ordering.

Q: What is the recommended installation procedure for these articulated pistons?
A: Ensure the crown and skirt are assembled with the correct orientation and pin retention. Use new piston rings and lubricate all sliding surfaces during installation. Torque connecting rod bolts to Cummins specifications (typically 120–140 Nm for N14 engines). Break-in the engine at reduced load for the first 50 hours.

Q: Can I use this piston assembly with aftermarket cylinder liners?
A: Yes, as long as the liners are standard size (139.7mm bore) and meet OEM specifications for surface finish and hardness. For Celect Plus engines, ensure the piston cooling jet alignment matches the oil gallery in the crown. Mismatched components can cause premature wear or seizure.