4TNV98 Intake Valve Seat 129115-15221 & Exhaust Valve Seat 129115-15220 for Yanmar Engine Spare

Product Details

Product Overview

This listing offers a matched set of precision-engineered intake and exhaust valve seats specifically designed for the Yanmar 4TNV98 diesel engine. The set includes the intake valve seat (Part Number: 129115-15221) and the exhaust valve seat (Part Number: 129115-15220), ensuring a complete cylinder head service solution.

Manufactured to original equipment specifications, these valve seats are critical components for maintaining proper compression, sealing, and heat dissipation within the combustion chamber. They are an ideal replacement part for Yanmar industrial, agricultural, construction, and marine engines utilizing the 4TNV98 platform, helping to restore engine performance and reliability during a top-end overhaul or head rebuild.

Key Features & Benefits

• OEM Specification Fitment: Manufactured to match the exact dimensions and material hardness of the original Yanmar parts, ensuring a secure, leak-free seal without modification.
• Durable Material Composition: Constructed from high-grade alloy steel to withstand the extreme temperatures and pressures of diesel combustion, reducing the risk of valve recession and seat wear.
• Complete Set Solution: Includes both the intake (129115-15221) and exhaust (129115-15220) valve seats, simplifying parts sourcing and ensuring component compatibility.
• Enhanced Engine Performance: Properly seated valves improve cylinder compression, leading to better fuel efficiency, reduced emissions, and smoother engine operation.
• Direct Replacement for Overhauls: An essential component for any 4TNV98 engine rebuild or cylinder head service, helping to extend the engine’s operational lifespan.
• Stringent Quality Control: Each valve seat undergoes dimensional and surface finish inspection to guarantee a precise interference fit in the cylinder head.

Technical Specifications

OEM Cross-Reference

This valve seat set is a direct replacement for the following original Yanmar part numbers:

• Intake Valve Seat: 129115-15221
• Exhaust Valve Seat: 129115-15220

Note: Always verify the part number stamped on your original valve seat or consult your engine service manual to confirm compatibility before purchasing.

Compatibility

This valve seat set is specifically designed for the Yanmar 4TNV98 diesel engine. This engine platform is commonly used for powering a wide range of equipment, including:

• Construction Machinery: Mini excavators, compact track loaders, and backhoes.
• Agricultural Equipment: Tractors, harvesters, and irrigation pumps.
• Industrial Applications: Forklifts, generators (gensets), and air compressors.
• Marine Applications: Auxiliary power units and small vessel propulsion.
• Material Handling: Telehandlers and boom lifts.

Fitment is confirmed for the 4TNV98 engine model. Please verify your specific engine serial number for complete compatibility.

Global Supply & Distribution

We maintain a robust global supply chain to serve B2B customers across all major markets. From our distribution hub in Guangdong, China, we offer reliable shipping to:

• North America: Ports of Los Angeles, Houston, and New York.
• Europe: Ports of Rotterdam, Hamburg, and Antwerp.
• Asia-Pacific: Ports of Singapore, Busan, and Sydney.
• Middle East & Africa: Ports of Dubai, Jeddah, and Durban.
• South America: Ports of Santos and Buenos Aires.

We offer flexible shipping options including express courier (DHL, FedEx, UPS), air freight, and sea freight. Our logistics team ensures proper export documentation and customs compliance for smooth international transactions.

Quality Assurance

• Manufacturing Standards: Parts are produced in ISO-certified facilities, adhering to strict quality management protocols.
• Inspection: Each batch undergoes a Machinery Test Report and Video Outgoing Inspection to verify dimensional accuracy and material integrity.
• Warranty: Backed by a 6-month warranty against manufacturing defects in materials and workmanship.
• After-Sales Support: Our team provides online technical support to assist with installation questions or performance concerns.

FAQ

Q1: Do these valve seats require machining for installation?
A: These valve seats are manufactured to standard OEM dimensions for the 4TNV98 cylinder head. However, proper installation typically requires a valve seat cutter or grinder to achieve the correct interference fit and seat angle. We recommend having a qualified machine shop or diesel technician perform the installation to ensure a perfect seal.

Q2: What is the difference between the intake (129115-15221) and exhaust (129115-15220) valve seats?
A: The primary difference is material composition and design. Exhaust valve seats (129115-15220) are typically made from a harder, more heat-resistant alloy to withstand the higher temperatures of exhaust gases. Intake valve seats (129115-15221) are designed for optimal sealing under cooler intake air conditions. It is critical to install each seat in its correct position to prevent premature failure.

Q3: Can I use these valve seats in a 4TNV98 engine that has been rebuilt with oversized valves?
A: No. This set is specifically for standard OEM-size valve seats. If your cylinder head has been machined for oversized valves, you will require oversized valve seats. Always measure your cylinder head’s valve pocket diameter and compare it to the OEM specification before ordering. For modified engines, please contact us with your specific requirements.