Yanmar 4D84-2 Crankshaft 129508-21001 | Diesel Engine Rebuild Part

Product Details

Product Overview

This high-precision Yanmar 4D84-2 Crankshaft (Part Number: 129508-21001) is a critical component for diesel engine rebuilds and overhauls. Designed to meet OEM specifications, it ensures optimal rotational balance and durability for heavy-duty applications. We provide global shipping to major industrial hubs including the United States, Germany, Japan, South Korea, and the Middle East, with reliable logistics to minimize downtime for B2B clients.

Key Features & Benefits

• OEM-Grade Precision: Manufactured to Yanmar’s exact tolerances for a perfect fit and smooth operation.
• Enhanced Durability: Constructed from high-strength forged steel to withstand extreme combustion pressures and torsional stress.
• Improved Lubrication: Optimized oil passage design ensures consistent lubrication to main and connecting rod bearings, reducing wear.
• Rigorous Testing: 100% inspected for dimensional accuracy, surface hardness, and magnetic particle flaws.
• Long Service Life: Designed to match or exceed the original part’s lifespan, reducing total cost of ownership.

Technical Specifications

OEM Cross-Reference

• Yanmar OEM Number: 129508-21001
• Alternative OEM Number: 129508-21000

Compatibility

• Engine Models: Yanmar 4D84-2, 4D84-2E, 4D84-2F
• Applications: Industrial diesel generators, agricultural tractors, construction equipment (mini excavators, compact loaders), and marine auxiliary engines.
• Year Range: Generally compatible with engines manufactured from the mid-1990s to present. Verify your engine serial number for exact fitment.

Global Supply & Distribution

We specialize in the international supply of Yanmar diesel engine parts. Our distribution network ensures fast, reliable delivery to key markets worldwide:

• North America: Warehousing and express shipping to the USA, Canada, and Mexico.
• Europe: Direct distribution to Germany, the UK, Netherlands, and France.
• Asia-Pacific: Rapid delivery to Japan, South Korea, China, and Australia.
• Middle East & Africa: Service to UAE, Saudi Arabia, South Africa, and Egypt.
• South America: Coverage for Brazil, Argentina, and Chile.

We handle all export documentation and customs clearance procedures to ensure a seamless transaction for our B2B partners.

Quality Assurance

• Manufacturing Standard: ISO 9001:2015 certified production facility.
• Material Certification: Mill test reports available upon request.
• Inspection: Each crankshaft undergoes dimensional, hardness, and non-destructive testing (magnetic particle inspection).
• Warranty: 12-month warranty against manufacturing defects from the date of shipment.

FAQ

Q1: Will this crankshaft fit my Yanmar 4D84-2 engine without modification?
A: Yes, this is a direct replacement part. It is manufactured to the exact OEM specifications (129508-21001) and requires no modification. However, we recommend checking the main bearing bore condition and replacing bearings during installation.

Q2: What is the recommended installation procedure for this crankshaft?
A: Professional installation is strongly advised. Key steps include: cleaning the block and main bearing saddles, applying assembly lube to bearings and journals, torquing main bearing caps to the specified sequence and torque (consult your engine service manual), and checking end-play after installation.

Q3: How can I verify this is the correct part for my engine?
A: Locate your engine’s serial number and the part number on your old crankshaft. Compare it to our listed OEM numbers: 129508-21001 or 129508-21000. If you have any doubts, please contact our technical support team with your engine model and serial number for verification before purchase.