Product Overview

This high-precision Fuel Injection Pump X4 Head Rotor is a direct replacement component designed specifically for Yanmar industrial diesel engines. Manufactured to meet or exceed OEM specifications, this rotor is essential for maintaining optimal fuel delivery, combustion efficiency, and engine performance. We supply this critical part globally, serving major markets including North America, Europe, Southeast Asia, the Middle East, and South America with reliable logistics and competitive pricing for B2B clients, workshops, and parts distributors.

Key Features & Benefits

• Precision Engineering: Machined from high-speed steel to ensure tight tolerances and long service life under high-pressure fuel injection conditions.
• 100% Professional Tested: Each unit undergoes rigorous performance and pressure testing to guarantee reliable fuel metering and distribution.
• Direct OEM Replacement: Matches the form, fit, and function of the original Yanmar part numbers 119940-51741 and 129602-51741.
• Enhanced Durability: Hardened surface treatment provides superior wear resistance against fuel contaminants and high-cycle operation.
• Improved Engine Performance: Ensures consistent fuel pressure and timing, leading to smoother idle, better power output, and reduced emissions.

Technical Specifications

OEM Cross-Reference

• Yanmar OEM: 119940-51741, 129602-51741

Note: This part is the X4 (4-plunger) head rotor assembly for the injection pump. Verify your existing pump model before ordering.

Compatibility

• Engine Models:
  • Yanmar 3TNV88
  • Yanmar 3TNV88-SA
  • Yanmar 3TNV88-DSA
  • Yanmar 4TNE88
  • Yanmar 4TNV88
  • Yanmar 4TNV84
• Vehicle/Equipment Application: Designed for use in Yanmar-powered industrial equipment, compact construction machinery, agricultural tractors, generators, and marine auxiliary engines utilizing the TNV/TNE series fuel injection system.

Global Supply & Distribution

We offer efficient worldwide shipping to support your supply chain needs. Our logistics network ensures fast delivery to major industrial hubs and ports including Los Angeles, Rotterdam, Dubai, Singapore, Shanghai, and Santos. We serve a diverse range of B2B clients including parts wholesalers, engine rebuilders, and equipment dealers across North America, Europe, Asia-Pacific, the Middle East, Africa, and Latin America. Our export experience ensures smooth customs clearance and compliance with international trade regulations.

Quality Assurance

This Fuel Injection Pump Head Rotor is manufactured in a certified facility with strict quality control processes. Each component is 100% professionally tested for dimensional accuracy, pressure integrity, and flow performance before shipment. We back our product with a 6-month warranty against manufacturing defects, providing you with peace of mind for your inventory or repair needs. Our quality standards ensure reliable operation in demanding diesel engine environments.

FAQ

Q: What is the difference between the 119940-51741 and 129602-51741 part numbers?
A: The 129602-51741 is a later supersession or alternative OEM number for the same X4 head rotor assembly. Both numbers are interchangeable and refer to the same component specifications for the Yanmar 4-cylinder injection pump. You can use either number for cross-referencing.

Q: Is this head rotor a direct fit for my Yanmar 4TNV88 engine?
A: Yes, this X4 head rotor is designed for the injection pump used on the 4TNV88 engine, as well as the 3TNV88 and 4TNE88 models. However, we recommend verifying your injection pump model (e.g., Bosch, Yanmar, or Zexel type) to ensure the rotor matches the pump’s internal configuration before installation.

Q: What maintenance is required when replacing the head rotor?
A: When replacing the head rotor, it is critical to ensure absolute cleanliness of the fuel system. We recommend replacing the fuel filter, cleaning the injection pump housing, and using clean diesel fuel. Professional installation is advised as the rotor timing and clearance settings are sensitive. After installation, the injection pump must be re-timed to the engine according to the Yanmar service manual to ensure correct engine performance.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .