4D84-2 4TN84 Cylinder Block Assembly for Yanmar Diesel Engine

Product Details

Product Overview

This 4D84-2 / 4TN84 Cylinder Block Assembly is a precision-engineered replacement component designed for Yanmar industrial diesel engines. As the structural foundation of the engine, this cylinder block ensures robust support for all internal moving parts, including the crankshaft, pistons, and cylinder liners. Manufactured to OEM specifications, it is a critical part for engine overhauls and rebuilds in heavy-duty applications.

Commonly used in construction machinery, agricultural equipment, generator sets, marine propulsion, and material handling systems, this assembly is sourced from a reliable Chinese manufacturer () with a strong track record in supplying aftermarket and replacement parts. The block is cast from high-strength alloy iron to withstand the thermal and mechanical stresses of continuous diesel operation.

Note: This part is designed for direct replacement of the original Yanmar component. Professional installation by a qualified diesel mechanic is recommended to ensure proper fitment and engine performance.

Key Features & Benefits

• OEM Specification: Manufactured to match the exact dimensions and tolerances of the original Yanmar 4D84-2 / 4TN84 cylinder block, ensuring seamless integration.
• High-Strength Casting: Constructed from premium-grade grey cast iron, providing exceptional rigidity, vibration dampening, and long-term durability under heavy loads.
• Precision Machining: Cylinder bores, main bearing journals, and deck surfaces are machined to tight tolerances for optimal piston ring seal and crankshaft alignment.
• Rigorous Testing: Each block undergoes pressure testing and dimensional inspection to guarantee structural integrity and freedom from casting defects.
• Versatile Application: Suitable for a wide range of Yanmar-powered equipment in construction, agriculture, marine, and industrial sectors.
• Complete Assembly: Includes core components ready for installation of cylinder liners, pistons, and other internal engine parts (core block only; internal components sold separately).

Technical Specifications

OEM Cross-Reference

This cylinder block assembly is a direct replacement for the following OEM Yanmar part numbers and engine specifications:

• Yanmar 4D84-2 (Cylinder Block Assembly)
• Yanmar 4TN84 (Cylinder Block Assembly)
• Yanmar 4TN84L (Cylinder Block Assembly)

Note: Always verify the engine model and serial number on your specific equipment to confirm compatibility.

Compatibility

This cylinder block is commonly used for the following Yanmar engine series and applications:

• Engine Models: Yanmar 4D84-2, 4TN84, 4TN84L
• Typical Applications:
  • Construction: Mini excavators, compact loaders
  • Agriculture: Tractors, harvesters, tillers
  • Industrial: Generators, pumps, compressors
  • Marine: Small workboats, auxiliary engines
  • Material Handling: Forklifts, telehandlers

Important: This part is designed for Yanmar engines. It is the buyer’s responsibility to cross-reference part numbers and engine specifications before purchase.

Global Supply & Distribution

We provide worldwide shipping with fast and reliable logistics to major industrial hubs. Our distribution network covers:

• North America: Regular shipments to the USA, Canada, and Mexico via air and sea freight.
• Europe: Rapid delivery to Germany, UK, Netherlands, France, and other EU markets.
• Asia-Pacific: Efficient supply to Japan, South Korea, Australia, and Southeast Asia.
• Middle East & Africa: Serving UAE, Saudi Arabia, South Africa, and key industrial zones.
• South America: Export experience to Brazil, Argentina, and Chile.

We offer flexible shipping options including FOB (Guangzhou/Shenzhen), CIF, and DDP for qualified orders. All shipments are professionally packed to prevent damage during transit.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001-certified facilities with strict quality control procedures.
• Testing: Each cylinder block is 100% inspected for casting integrity, dimensional accuracy, and surface finish. Video outgoing inspection is available upon request.
• Warranty: 6-month warranty against manufacturing defects under normal operating conditions.
• Documentation: Machinery test reports and inspection certificates are provided with each shipment.

FAQ

Q1: How do I confirm this cylinder block fits my Yanmar engine?
A: Please check your engine’s model number (e.g., 4TN84, 4D84-2) and serial number. This block is designed for the Yanmar 4D84-2 and 4TN84 series. Compare the casting numbers and bore dimensions with your original part. If you are unsure, provide us with your engine code, and our technical team can assist with cross-referencing.

Q2: Does this block come with cylinder liners and pistons installed?
A: No, this is a bare cylinder block assembly. It does not include cylinder liners, pistons, rings, bearings, or other internal components. It is machined and ready for the installation of your existing or new internal engine parts.

Q3: What is the recommended installation procedure?
A: Professional installation is strongly recommended. Key steps include: (1) Thoroughly clean the block and oil passages; (2) Check main bearing bore alignment; (3) Install cylinder liners (if applicable) with proper protrusion; (4) Follow Yanmar factory torque specifications for all bolts. Always refer to the official Yanmar service manual for your engine model.