376-6403 Injector Sealing Washer supports reliable injector seating for B2B excavator engine parts repair, overhaul, and wholesale sourcing.
The 376-6403 Injector Sealing Washer YNF17902 is used at a compatible diesel fuel injector installation position to provide a sealing interface between the injector and its seating area. Proper sealing helps combustion gases, pressure, and contaminants be controlled around the injector mounting point during engine operation.
Because injector seal washers are exposed to heat, compression, and repeated engine cycles, they may become flattened, damaged, or unsuitable for reuse after injector removal. Replacement is therefore commonly considered during injector servicing and cylinder-head repair.
For B2B buyers, the 376-6403 injector seal washer should be confirmed by part number, engine application, injector configuration, dimensions, and existing-part photos before quantity purchasing. Accurate matching helps engine repair workshops and spare parts distributors avoid leakage-related rework, unnecessary downtime, and incorrect inventory.
| Parameter | Specification |
|---|---|
| YNF Part Number | YNF17902 |
| Part Number | 376-6403 / 3766403 |
| Product Name | Injector Sealing Washer |
| Alternative Name | Injector Seal Washer / Injector Copper Washer / Nozzle Seal Washer |
| Product Type | Injector Sealing Component |
| Parts Category | Diesel Engine / Fuel Injection Parts |
| Main Function | Injector Seating and Sealing |
| Application | Compatible Diesel Engine Injector System |
| Installation | Injector Seat / Cylinder Head Area |
| Typical Service | Injector Replacement / Engine Repair / Cylinder Head Overhaul |
| Material | Metal Sealing Washer |
| Fitment Check | Part Number / Engine Application / Dimensions / Existing Part Photo |
| Quality Type | Aftermarket Replacement |
| Condition | New |
| Brand | YNF |
| Origin | China |
| MOQ | 1 Piece |
| Shipping Method | Air, Sea, Express |
| Payment Terms | T/T, PayPal, Western Union |
| Application | Description |
|---|---|
| Fuel Injector Installation | Provides a sealing interface at the injector seating area |
| Diesel Engine Repair | Suitable for replacement during injector servicing |
| Cylinder Head Repair | Used when the injector mounting area is being rebuilt |
| Injector Replacement | Commonly renewed when an injector is removed and reinstalled |
| Engine Overhaul | Suitable for diesel engine rebuilding applications |
| Leakage Repair | Used when injector-seat sealing components require replacement |
| Spare Parts Distribution | Suitable for engine parts wholesalers and dealers |
| B2B Inventory | Practical for repair workshops and excavator parts stockists |
Q: What is the part number of this injector seal washer?
A: The reference part number is 376-6403.
Q: What is the YNF part number?
A: The YNF part number is YNF17902.
Q: What type of product is 376-6403?
A: It is an injector sealing washer used at a compatible diesel fuel injector seating area.
Q: Is this also called an injector copper washer?
A: Yes. Injector copper washer, injector seal washer, and nozzle sealing washer are common aftermarket search terms for this type of component.
YNF Machinery supplies 376-6403 injector sealing washers and related diesel engine fuel-system parts for machinery dealers, engine rebuilders, repair workshops, wholesalers, and international importers.
The YNF17902 injector seal washer is a small component, but its sealing function is important during injector installation. A worn, deformed, or incorrectly matched washer may affect the injector seating area and can lead to additional repair work.
Professional buyers can provide the 376-6403 part number, engine information, required quantity, washer dimensions, and photos of the removed component for confirmation before ordering.
For B2B distributors preparing injector repair stock, sealing washers can also be purchased together with injectors, injector sleeves, O-rings, fuel-system seals, and other excavator engine parts. Multiple small repair items can therefore be consolidated into one purchasing inquiry.
