Know When It's Time to Replace Your Bosch Plunger & Barrel

Your plunger and barrel assembly controls injection timing and fuel volume—two factors critical to efficient diesel performance. Watch for these common signs that a replacement may be due:

• Uneven Engine Firing

Misfiring cylinders can indicate that the plunger is not creating consistent pressure across injection cycles.

• Hard Starting and Rough Idle

Worn components may cause poor fuel atomization, resulting in delayed ignition or unstable idle RPM.

• Visible Fuel Leaks

Seepage around the plunger housing or barrel often points to internal scoring or seal wear.

• Drop in Power Under Load

Insufficient fuel volume during peak demand can lead to sluggish acceleration or reduced torque.

• Smoke on Acceleration

Excess fuel from incomplete combustion may suggest an out-of-spec barrel or sticking plunger.

If your engine is showing one or more of these symptoms, it may be time to replace the assembly with a professionally inspected Bosch unit.

Choose the Right Option: New, Rebuilt, or Used Assemblies

Every diesel repair is different, which is why we offer Bosch plungers and barrels in three distinct conditions. Each one is inspected for quality and sold according to your performance needs and budget:

New Bosch Plungers & Barrels

• Manufactured to Bosch’s original factory specs
  
  
• Ideal for mission-critical engines and long-term performance
  
  
• Packaged in original boxes and free from prior use
  

Professionally Rebuilt Units

• Reassembled by remanufacturers using OEM-grade components
  
  
• Internals like plungers, barrels, and springs are replaced or reconditioned
  
  
• Ideal for restoring performance at a reduced cost
  

Used Bosch Assemblies

• Removed from running engines and inspected at our facility
  
  
• Checked for wear, scoring, and plunger free movement
  
  
• Suitable for budget repairs or temporary use where cost control matters most

Not sure which one fits your project best? Our experts can help you compare options by price, lead time, and application.

Explore Our Bosch Plunger & Barrel Inventory for 2025

Goldfarb offers dozens of Bosch part numbers sourced from worldwide suppliers. These are popular choices among rebuilders and service technicians for their compatibility and reliability:

• 1-418-305-004 — Used in Kubota equipment
  
  
• 1-418-325-024N — Common fit for Case agricultural engines
  
  
• 1-418-325-036N — Frequently installed in Mercedes diesel platforms
  
  
• 2-418-455-500N — Designed to fit Renault applications
  
  
• 1-418-325-022 — Compatible with Fiat/KHD configurations
  
  
• 2-418-455-265N — Used across light- to medium-duty diesel engines
  

Additional part numbers are available for various diesel applications. You can search by OEM reference or engine model directly on our site.

Engine Brands Compatible with Bosch Plunger & Barrel Assemblies

Bosch plunger and barrel sets support a wide range of globally recognized diesel platforms. Our inventory includes fitments for:

Mercedes

Used in commercial vans, on-highway trucks, and stationary industrial engines requiring high injection pressure.

Kubota

Ideal for compact tractors, generators, and light construction machinery known for their tight tolerances.

Case IH

Found in tractors, balers, and field equipment where consistent fuel delivery is critical to field productivity.

Mitsubishi

Installed in light-duty diesel vehicles and machinery across industrial and marine use cases.

Volvo

Powering trucks, equipment, and marine platforms that need smooth injection under continuous load.

Fiat KHD & Renault

European diesel systems benefit from the precision and reliability Bosch components are known for.

Our parts are also suitable for engines from Hino, Isuzu, Nissan, Toyota, IHI, Deutz, Hatz, and more. If you don’t see your brand listed, reach out with your OEM number and we’ll help confirm compatibility.

Key Applications for Bosch Diesel Plungers & Barrels

Bosch injection components are widely used across industries. Common applications include:

• Agricultural Machinery

Tractors, harvesters, and sprayers that demand long-term durability in dusty or high-load environments.

• Heavy-Duty Trucks

Road haulers and freight carriers that require consistent power and dependable fuel delivery.

• Marine & Auxiliary Power Units

Engines supporting vessels, generators, and pumps that operate under variable load conditions.

• Construction Equipment

Excavators, loaders, and graders where performance in dirty, high-vibration settings is essential.

• Industrial Standby Systems

Diesel-powered backup generators and compressors where downtime is not an option.

No matter the use case, Goldfarb’s Bosch components are chosen by professionals who value performance and reliability.

How to Find the Right Assembly for Your Engine

We make it easy to track down the exact plunger and barrel your engine needs:

• Use our search filters to browse by part number, engine make, or condition.
  
  
• Reach out to our team for expert assistance with OEM cross-references.
  
  
• Don’t see your engine listed? Let us verify your specs and locate a fit from our extended inventory.
  

Fast Ordering and Shipping That Keeps You Moving

At Goldfarb, we know time is critical. That’s why we’ve streamlined the purchase process:

1. Search or contact us with your engine model or part number.
   
   
2. Confirm specifications with our detailed product listings.
   
   
3. Add to cart and choose shipping—standard or expedited available.
   
   
4. Complete secure checkout and receive confirmation and tracking instantly.
   

Orders placed before 3:30 PM EST on business days ship the same day from our Maryland warehouse. Free shipping applies to qualifying orders.

Why Diesel Professionals Prefer Goldfarb & Associates

Two Decades of Diesel Expertise

We understand fuel systems from the inside out and help you get the right part the first time.

Carefully Inspected Inventory

Every item is evaluated using a detailed physical and visual checklist to verify quality and fit.

One of the Largest Bosch Selections Available

Our stock includes both common and hard-to-find Bosch part numbers ready for immediate shipping.

Trusted Supplier to the Trade

Rebuilders, repair shops, and engine technicians across the U.S. rely on our experience and support.

International Shipping and Support

We ship worldwide and assist customers with international specs and logistics.

Frequently Asked Questions

Are Bosch plungers and barrels sold as a set?

Yes, all units include the plunger and barrel as a matched pair for proper fitment and function.

Do used parts come ready to install?

Used parts are not guaranteed to be ready for installation. Each unit is inspected for rebuildable condition and may require servicing before use.

What if I receive the wrong part or it's damaged?

Contact us immediately. If the part was misrepresented or arrives in a different condition than promised, we’ll provide a refund or replacement.

Can you confirm fitment before I order?

Absolutely. Provide your OEM number or engine details, and we’ll confirm fitment before shipping.

Do you test rebuilt or used plungers and barrels?

We do not test parts in-house, but all rebuilt units come from trusted remanufacturers and are visually and physically inspected at our warehouse.

Ready to Restore Your Engine's Precision?

Shop Goldfarb & Associates for new, rebuilt, and used Bosch plungers and barrels backed by decades of experience and fast shipping. Explore our inventory today or call for personal assistance from our diesel specialists.

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