Product Details

Product Overview

This high-quality Cummins 4BT Valve Seat (Part Numbers 3904105 & 3906854) is a critical component for maintaining optimal compression and sealing in your diesel engine. Designed for the robust 4BT engine platform, this valve seat ensures a perfect seal between the valve and cylinder head, preventing gas leakage and maximizing engine efficiency. We supply this part globally, serving major markets including North America, Europe, Asia-Pacific, the Middle East, and South America, with fast and reliable shipping to major industrial hubs.

Key Features & Benefits

• Premium Material: Manufactured from high-grade alloy steel for exceptional wear resistance and longevity, even under extreme heat and pressure.
• Precision Engineering: CNC machined to exact OEM specifications (3904105 & 3906854) for a perfect, no-hassle fit on 4BT cylinder heads.
• Enhanced Durability: Designed to withstand the harsh conditions of heavy-duty diesel operation, reducing the risk of valve recession and seat pitting.
• Improved Engine Performance: Ensures a tight seal, optimizing compression, reducing blow-by, and improving fuel efficiency and power output.
• Rigorous Testing: Each valve seat undergoes strict quality control checks for hardness, concentricity, and surface finish to guarantee reliability.

Technical Specifications

OEM Cross-Reference

This valve seat is a direct replacement for the following OEM numbers:

• Cummins Part Number: 3904105 (Intake Valve Seat)
• Cummins Part Number: 3906854 (Exhaust Valve Seat)
• Alternative/Cross-Reference: May also be referenced in older Cummins parts catalogs under similar B-series numbers.

Compatibility

• Primary Engine: Cummins 4BT 3.9L (B-Series) – Commonly used in industrial, agricultural, and marine applications.
• Vehicle Applications: Fits various applications including:
  • Dodge Ram 2500/3500 (1989-1998 models with 4BT conversion or original fitment)
  • Freightliner & International medium-duty trucks
  • Construction equipment (Case, John Deere, JCB)
  • Generator sets and industrial pumps
• Note: Always verify your cylinder head year and serial number to ensure correct fitment.

Global Supply & Distribution

We are a dedicated supplier of Cummins diesel engine parts with a robust global logistics network. We serve clients in over 40 countries, including the United States, Canada, Germany, Australia, UAE, Saudi Arabia, Singapore, and Brazil. Our distribution centers ensure fast and cost-effective delivery to major ports like Rotterdam, Shanghai, Dubai, and Houston. We specialize in B2B bulk orders and maintain a strong track record of on-time delivery and customs compliance.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001:2015 certified facilities.
• Certifications: Material test reports (MTR) available upon request.
• Warranty: 12-month warranty against manufacturing defects under normal operating conditions.
• Testing: 100% inspected for dimensional accuracy and hardness. Samples undergo destructive testing for quality validation.

FAQ

Q: How do I know if I need an intake or exhaust valve seat (3904105 vs 3906854)?
A: The 3904105 is typically the intake valve seat (smaller inner diameter), while the 3906854 is the exhaust valve seat (larger inner diameter). Exhaust seats are designed to withstand higher thermal loads. Always replace all valve seats in a cylinder head as a set for balanced performance.

Q: Can this valve seat be installed without a machine shop?
A: No. Valve seat replacement requires specialized tools and equipment. The cylinder head must be removed, the old seat cut out, and the new seat pressed or shrunk-fit into place. A professional machine shop is required to ensure correct valve-to-seat concentricity and proper seat width.

Q: What is the recommended maintenance for these valve seats?
A: Valve seats typically last the life of the engine if properly maintained. However, if you experience compression loss, backfiring through the intake, or visible pitting on the seat surface during a rebuild, replacement is necessary. Always use the correct valve guide clearance to prevent premature seat wear.

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 .