Product Overview

This high-precision Plunger and Barrel Assembly is a critical component for diesel fuel injection systems, specifically designed for Lucas CAV-type injection pumps. As a direct replacement for OEM numbers 51250653 and A503673, this unit ensures optimal fuel metering and pressure generation. Sourced from a professional manufacturer in Shandong, China, this component is held to strict quality standards and is available for global export, serving markets in North America, Europe, the Middle East, and Asia-Pacific. Ideal for B2B buyers seeking reliable replacement parts for commercial diesel engines, this assembly supports fast delivery to major industrial hubs and ports worldwide.

Key Features & Benefits

• Precision Engineering: Manufactured from high-speed steel for superior wear resistance and long service life under high-pressure injection conditions.
• Direct Fitment: 100% new replacement part designed to match original Lucas specifications for seamless installation.
• Enhanced Fuel Efficiency: Tight tolerances ensure accurate fuel delivery, reducing fuel consumption and improving engine performance.
• Reliable Starting: Maintains consistent injection timing and pressure for reliable cold starts and smooth idling.
• Professional Support: Backed by a 4-month warranty and dedicated service to assist with fitment and technical inquiries.

Technical Specifications

OEM Cross-Reference

This plunger and barrel assembly is a direct replacement for the following OEM part numbers:

• 51250653
• A503673
• Alternative Reference: 512506-53

Compatibility

• Engine Application: Suitable for diesel engines utilizing Lucas CAV-type fuel injection pumps.
• Vehicle Type: Commonly used in diesel trucks, agricultural tractors, and industrial machinery.
• Note: Verify your pump model and part number before ordering to ensure correct fitment.

Global Supply & Distribution

• Worldwide Shipping: We ship to all major global markets, including North America, Europe, the Middle East, Southeast Asia, and Africa.
• Fast Logistics: Efficient shipping to major ports and industrial centers via air and sea freight.
• Export Compliance: Experienced in international trade, ensuring proper documentation and customs clearance.
• B2B Focus: Professional packaging and bulk order capability (MOQ 24 pcs) for wholesale and aftermarket suppliers.

Quality Assurance

• Manufacturing Standards: Produced in a quality-controlled facility using high-speed steel for durability.
• Testing: Each unit is inspected for dimensional accuracy and surface finish before shipment.
• Warranty: Backed by a 4-month warranty against manufacturing defects.

FAQ

Q: Is this plunger and barrel assembly compatible with all Lucas injection pumps?

A: This assembly is specifically designed for Lucas CAV-type pumps that require part numbers 51250653 or A503673. Always cross-reference your pump’s part number to confirm compatibility, as plunger sizes and barrel dimensions vary by pump model.

Q: What installation precautions should be taken?

A: Installation should be performed by a qualified diesel technician. Ensure the plunger and barrel are kept clean and lubricated with diesel fuel during assembly. Never force the plunger into the barrel; it should slide freely. Proper torque specifications for the pump housing must be followed to avoid damage.

Q: How does this part affect engine performance?

A: A worn or incorrect plunger and barrel can cause hard starting, low power, and excessive smoke. This new assembly restores proper fuel delivery and injection pressure, leading to smoother operation, better fuel economy, and reduced emissions. Regular replacement is recommended as part of pump maintenance.

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 .