Product Overview

This high-precision Diesel Injection Pump Plunger P121 (134151-4120) is a critical fuel system component engineered specifically for the Nissan RF8 engine and WB520 fuel pump applications. Manufactured to meet or exceed OEM specifications, this plunger element ensures optimal fuel metering and injection pressure for maximum engine performance and efficiency. We supply this premium component to global markets including North America, Europe, Southeast Asia, and the Middle East, ensuring fast and reliable delivery from our Shandong, China facility to any major port worldwide.

Key Features & Benefits

• Precision Engineering: Manufactured from high-speed steel with micron-level tolerances for consistent fuel delivery and reduced wear.
• Enhanced Durability: Designed to withstand extreme pressures and temperatures within the injection pump, extending service life.
• 100% Professional Tested: Every plunger undergoes rigorous performance testing to guarantee leak-free operation and accurate fuel metering.
• Direct OEM Replacement: Exact fit for the original part number 134151-4120, eliminating modification needs and installation guesswork.
• Improved Fuel Efficiency: Restores proper injection timing and pressure, leading to better combustion and reduced fuel consumption.

Technical Specifications

OEM Cross-Reference

This plunger element is a direct replacement for the following OEM numbers:

• 134151-4120 (Primary OE Number)
• Also compatible with injection pump applications for the Nissan RF8 and WB520 series.

Note: Always verify your existing part number before ordering to ensure correct fitment.

Compatibility

This fuel pump plunger is specifically designed for:

• Engine Model: Nissan RF8 Diesel Engine
• Fuel Pump Model: WB520 Injection Pump
• Vehicle Fitment: Standard for commercial diesel vehicles and industrial equipment utilizing the RF8 engine platform.

Application years vary by vehicle model; please confirm engine code RF8.

Global Supply & Distribution

We provide worldwide shipping solutions to meet B2B demands:

• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, France, Netherlands), Asia-Pacific (Japan, South Korea, Australia), Middle East (UAE, Saudi Arabia), Africa, and South America.
• Fast Delivery: Standard lead time of 3-7 days from order confirmation. Bulk orders shipped within 10-15 days.
• Port of Dispatch: Any major China port (Qingdao, Shanghai, Shenzhen) with flexible shipping options (Express, Air Freight, Sea Freight).
• Trade Compliance: We adhere to international export standards and offer professional documentation for customs clearance.

Quality Assurance

Our commitment to quality is unwavering:

• Certifications: ISO 9001:2000 and TS 16949 certified manufacturing processes.
• Testing: 100% professional testing for dimensional accuracy, surface finish, and pressure integrity before shipment.
• Warranty: 1-year warranty against manufacturing defects in materials and workmanship.
• Packaging: Industrial standard packaging with inner polyester bag and outer paper carton to prevent damage during transit.

FAQ

Q1: How do I confirm this plunger fits my specific injection pump?

A: Check the part number stamped on your existing plunger or consult your injection pump service manual. This plunger (134151-4120, P121) is specifically designed for the Nissan RF8 engine paired with the WB520 fuel pump. If your application differs, please contact us with your engine and pump model numbers for cross-verification.

Q2: What is the recommended installation procedure for this plunger element?

A: Installation should be performed by a qualified diesel technician. The plunger must be installed with extreme cleanliness to avoid contamination. Lubricate with clean diesel fuel or assembly oil before insertion. Ensure proper orientation and torque specifications are followed as per the pump manufacturer’s guidelines. Improper installation can lead to pump failure or engine damage.

Q3: How can I maximize the service life of this plunger?

A: Service life is directly linked to fuel quality and filtration. Always use clean, high-quality diesel fuel and replace fuel filters at recommended intervals. Ensure the injection pump housing is free of water and debris. Regularly inspect for signs of wear or scoring. With proper maintenance, this high-speed steel plunger can provide thousands of hours of reliable service.

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 .