4D30G31 Main Bearing & Connecting Rod Bearing Set for China Engine | Diesel Engine Parts

Product Details

Product Overview

This is a premium quality 4D30G31 Main Bearing and Connecting Rod Bearing Set, specifically designed for China-sourced diesel engines. Manufactured by HD PARTS, this bearing set is a critical component for engine rebuilds and overhauls, ensuring precise crankshaft and connecting rod support. While commonly used in a variety of heavy-duty applications, it is essential to verify compatibility with your specific engine model to ensure a proper fit. This set offers a direct OEM-size replacement to restore your engine’s performance and longevity.

These bearings are ideal for diesel engines powering construction equipment, industrial machinery, agricultural tractors, generator sets, marine vessels, and material handling vehicles. Whether you are a workshop performing a full engine rebuild or a distributor stocking essential spare parts, this bearing set provides the reliability needed for demanding operational environments.

Each bearing is manufactured to meet strict dimensional tolerances, ensuring consistent oil clearance and load distribution. The set includes both main bearings and connecting rod bearings, providing a complete solution for the lower engine assembly.

Key Features & Benefits

• OEM-Spec Dimensions: Manufactured to standard OEM sizes for a direct, precise fit with no modifications required, reducing installation time and complexity.
• Durable Material Composition: Constructed from high-strength steel with a specialized bearing alloy layer, offering excellent fatigue resistance and load-bearing capacity for long service life.
• Complete Set: Includes both main bearings and connecting rod bearings in one package, providing a comprehensive solution for a full lower-end engine rebuild.
• Engineered for China Engines: Specifically designed for the 4D30G31 engine model, ensuring compatibility with Chinese-manufactured diesel power plants.
• Reliable Performance: Ensures proper oil film maintenance and reduces friction between moving parts, protecting the crankshaft and connecting rods from wear.
• Rigorous Quality Control: Backed by a 6-month warranty and supported by outgoing video inspection and machinery test reports, guaranteeing product integrity.

Technical Specifications

OEM Cross-Reference

This bearing set is designed as a direct replacement for the 4D30G31 engine. Please verify the specific OEM part number on your original bearings. Common cross-reference numbers for this set may include various manufacturer-specific codes for engines like the 4D30G31. It is recommended to compare your original bearing markings with the product specifications to confirm fitment. Contact our technical support team if you require assistance with identification.

Compatibility

This main bearing and connecting rod bearing set is specifically designed for the 4D30G31 diesel engine. This engine platform is commonly used for:

• Construction machinery (e.g., small excavators, loaders)
• Agricultural equipment (e.g., tractors, harvesters)
• Industrial engines (e.g., compressors, pumps)
• Generator sets (gensets)
• Marine auxiliary engines
• Material handling equipment (e.g., forklifts)

Note: Fitment is inferred based on the engine model. Always verify the engine model and bearing size before purchase. This part is not guaranteed to fit other engine models without verification.

Global Supply & Distribution

We provide worldwide shipping for this 4D30G31 bearing set, ensuring fast and reliable delivery to major industrial centers across the globe. Our distribution network covers key markets including:

• North America: Fast delivery to the USA, Canada, and Mexico via major ports like Los Angeles, Houston, and Vancouver.
• Europe: Efficient logistics to the UK, Germany, France, Netherlands, and other EU countries through Rotterdam, Hamburg, and other key hubs.
• Asia-Pacific: Direct shipping to Australia, New Zealand, Southeast Asia, and the Middle East (UAE, Saudi Arabia).
• South America & Africa: Reliable shipping options to Brazil, Chile, Nigeria, and South Africa.

We have extensive experience in international trade and customs compliance, ensuring a smooth purchasing experience for B2B buyers worldwide. Bulk orders are welcomed, and we offer competitive freight rates for container shipments.

Quality Assurance

At HD PARTS, quality is paramount. Each 4D30G31 bearing set is manufactured to strict tolerances using high-grade materials. Our quality assurance process includes:

• Manufacturing Standards: Produced in facilities adhering to ISO quality management principles.
• Inspection: Each batch undergoes outgoing video inspection and a machinery test report is available upon request, providing full traceability and quality verification.
• Warranty: We stand behind our products with a standard 6-month warranty against manufacturing defects in materials and workmanship.
• Packaging: Parts are securely packed in plastic bags, boxes, and cartons to prevent damage during transit.

FAQ

Q1: How can I be sure this 4D30G31 bearing set will fit my engine?

A: To confirm fitment, please check your engine model plate to ensure it is a 4D30G31. Additionally, inspect your existing bearings for any stamped OEM part numbers or size markings (e.g., STD, 0.25, 0.50). This set is for standard (STD) OEM size. If your crankshaft has been ground, you will require an undersized bearing set. We recommend consulting your engine manual or contacting our support team with your engine details for final confirmation.

Q2: What is the recommended installation procedure for these bearings?

A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Thoroughly clean the bearing housings and journals. 2) Check the bearing clearance using Plastigage to ensure it is within specification. 3) Apply clean engine oil to the bearing surfaces before assembly. 4) Tighten main bearing and connecting rod bolts to the manufacturer’s specified torque settings using a calibrated torque wrench. Never reuse old bolts or bearings.

Q3: What is the difference between main bearings and connecting rod bearings?

A: Main bearings support the crankshaft within the engine block, providing a smooth rotating surface for the entire crankshaft assembly. Connecting rod bearings sit between the connecting rod and the crankshaft journal, allowing the connecting rod to pivot smoothly as it transfers power from the piston. This set includes both types, which are specifically sized and matched for the 4D30G31 engine to ensure correct oil clearance and load distribution for optimal engine performance.