Cummins QSB4.5 4D107 Cylinder Block | Komatsu Engine Parts | Heavy-Duty Diesel

Product Details

Product Overview

This premium aftermarket cylinder block is specifically engineered for the Cummins QSB4.5 and 4D107 diesel engines, which are widely used in Komatsu construction and mining equipment. Manufactured to meet or exceed OEM specifications, this cylinder block provides the robust foundation required for heavy-duty applications. We offer global shipping from strategic warehouses in North America, Europe, and Asia-Pacific, ensuring fast delivery to industrial centers worldwide.

Key Features & Benefits

• Superior Casting Integrity: Manufactured from high-grade cast iron with a controlled metallurgical structure for maximum strength and thermal stability.
• Precision Machined Surfaces: Cylinder bores, deck face, and main bearing journals are machined to tight tolerances for optimal piston ring seal and crankshaft alignment.
• Enhanced Durability: Designed with reinforced bulkheads and water jacket cores to withstand extreme combustion pressures and thermal cycling in heavy-duty operation.
• Direct OEM Replacement: 100% interchangeable with the original Cummins cylinder block, simplifying installation and reducing downtime.
• Cost-Effective Solution: Provides significant savings compared to OEM parts without compromising on quality or performance.

Technical Specifications

OEM Cross-Reference

This cylinder block is a direct replacement for the following OEM part numbers:

• Cummins OEM: 3958686, 3972164, 3972165
• Komatsu OEM: 6D107-21110, 6D107-21111

Compatibility

This cylinder block is compatible with the following engine and equipment applications:

• Engine Models: Cummins QSB4.5, 4D107 (Tier 3 / Stage IIIA compliant variants)
• Komatsu Excavators: PC200-8, PC210-8, PC220-8, PC240-8, PC300-8
• Komatsu Bulldozers: D65EX-17, D85EX-17
• Other Equipment: Wheel loaders, dump trucks, and industrial machinery powered by QSB4.5 engines.

Global Supply & Distribution

As a leading supplier of heavy-duty engine components, we maintain a robust global distribution network:

• Worldwide Shipping: We ship to over 80 countries via air, sea, and express courier services.
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands, France), Asia-Pacific (China, Japan, Australia, Singapore), Middle East (UAE, Saudi Arabia), and Africa (South Africa, Nigeria).
• Fast Delivery: Standard delivery to major ports (e.g., Rotterdam, Shanghai, Houston) within 7-15 days. Express options available for urgent orders.
• Trade Compliance: We handle all export documentation, including customs clearance certificates of origin, ensuring smooth international transactions.

Quality Assurance

• Manufacturing Standards: Produced in an ISO 9001:2015 certified facility, ensuring consistent quality control.
• Testing Procedures: Each block undergoes 100% dimensional inspection, pressure testing for water and oil galleries, and ultrasonic testing for material integrity.
• Warranty: Backed by a comprehensive 12-month or 1500-hour warranty against manufacturing defects, whichever comes first.

FAQ

Q1: Is this cylinder block a direct bolt-on replacement for the OEM Cummins QSB4.5 block?

Yes, this aftermarket cylinder block is manufactured to the exact OEM specifications of the Cummins QSB4.5 and 4D107 engines. It is a direct, bolt-on replacement requiring no modifications. All critical dimensions, including bore size, deck height, main bearing bore, and bolt patterns, are precisely matched to the original part.

Q2: What should I inspect during installation to ensure proper fitment?

Before installation, we recommend the following checks: (1) Verify the cylinder bore size and surface finish for proper ring seal. (2) Inspect the main bearing bore alignment and ensure no debris or casting flash is present in oil passages. (3) Confirm the liner protrusion height (if applicable) is within the service manual specifications. Always use new OEM gaskets and seals during reassembly.

Q3: Does this block require honing before installation with new pistons and rings?

No, this cylinder block is supplied with a pre-honed, plateau-finished bore surface. It is ready for installation with standard-sized pistons and rings. Do not perform additional honing, as it may compromise the surface finish and ring seal. If you are using oversized pistons, please contact our technical support to discuss custom sizing options.