Description
Overview:
The Seat Nozzle (Yanmar MPN 114339-11551) is a Genuine Yanmar component used in the fuel injector assembly of small industrial diesel engines. This part is the injector nozzle seat washer, typically a precision copper heat shield that sits between the injector and the cylinder head. Its job is to create a gas-tight seal, control heat transfer to the injector tip, and ensure the injector sits at the correct height for accurate spray pattern and reliable combustion. Made from high-quality copper for excellent thermal conductivity and malleability, it crushes on installation to prevent combustion gas leakage and carbon tracking. It is a direct like-for-like replacement for the original part and should be renewed whenever injectors are removed or serviced in construction, agricultural, garden, and marine auxiliary engines.
Key Features:
- Genuine Yanmar OEM component for assured fit and performance (MPN 114339-11551)
- Functions as an injector heat shield and sealing washer between the injector and cylinder head
- High-grade copper construction crushes to form a secure, gas-tight seal
- Maintains correct injector protrusion to protect spray pattern and combustion efficiency
- Helps reduce blow-by and carbon build-up, supporting smooth starting and running
- Direct-fit replacement; no modifications required when the correct part number is specified
- Heat and corrosion resistant for reliable service life in harsh engine environments
- Recommended replacement whenever injectors are refitted or serviced
- Suitable for Yanmar industrial diesel applications across plant, agricultural, garden, and marine auxiliary equipment
- Supplied individually to match typical injector maintenance practices
Typical Applications:
Used during injector servicing and cylinder head reassembly on Yanmar diesel engines found in mini excavators, dumpers, compact tractors, generators, pumps, and professional garden machinery. It helps restore proper combustion sealing and injector positioning, improving reliability and reducing the risk of leaks or hot spots.
Also known as:
Injector copper washer, injector sealing washer, nozzle seat washer, injector heat shield, combustion sealing washer, injector crush washer.
Alternate Part Numbers:
114339 11551, 114339-11551, 11433911551
Product Specifications
| L&S Part No. | 114339 11551 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Yanmar |
| Unit of Sale | 1 |
| Fits Brands | Yanmar |
