High Pressure Pump Oil Seal 18×30×7mm ACM/NBR Material ISO/TS16949 Certified for ISUZU 6HK1 4HK1
| Outer Diameter: | 30mm | Inner Diameter: | 18mm |
| Height: | 7mm | Material: | ACM (Polyacrylate) / NBR |
| Operating Temperature: | -40°C To +150°C | Sealing Lip Design: | Spring-Loaded |
| Fuel Resistance: | Diesel Immersion Test Passed | Tolerance: | ±0.2mm |
| High Light: | 18×30×7mm High Pressure Pump Oil Seal,ACM/NBR Material Injector Pump Gas Cover Oil Seal,ISO/TS16949 Certified Fuel Line Seal Ring |
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High Pressure Pump Oil Seal 1-09639034-0 1096390340 for ISUZU 6HK1 4HK1 4JJ1 6UZ1-TC 6WG1 FVR NQR — 18×30×7mm/Elring Quality
The High Pressure Pump Oil Seal (Injector Pump Gas Cover Oil Seal) with OEM numbers 1-09639034-0 / 1096390340 (alternate 1-09639-034-0, 8-97943955-0, 16694-Z5500) is a verified direct-fit replacement for ISUZU 4HK1, 6HK1, 4JJ1, 6UZ1-TC, 6WG1 series diesel engines.
This oil seal is installed between the injection pump cover and cylinder head (where the fuel line passes through the cylinder head), serving as a critical sealing element of the high-pressure fuel system, widely used in ISUZU FVR, FTR, NPR, NPR-HD, NPR-XD, NQR, NRR series trucks and Hitachi ZAX330-3, ZX330 heavy equipment.
The high-pressure pump oil seal (also known as injector oil seal / fuel line seal ring) is installed where the fuel line passes through the cylinder head, made from fuel-resistant rubber (ACM/NBR). Its core function is to seal the gap between the fuel line and cylinder head, preventing high-pressure fuel leakage during delivery while blocking engine oil from seeping into the fuel system or externally. The seal withstands fuel system high pressure and engine high temperature, ensuring precise fuel delivery to the injectors and maintaining engine power output and fuel economy.
Replace immediately if any of these symptoms occur:
- Fuel Leakage — Visible diesel seepage around cylinder head; diesel odor (worn or aged sealing lip)
- Loss of Power — Poor acceleration; unstable operation (insufficient fuel pressure causing abnormal injection quantity)
- Hard Starting — Slow fuel system pressure buildup; difficult cold starts
- Oil Dilution — Abnormal oil level rise; thinned oil (fuel seeping into oil pan)
- Increased Fuel Consumption — Noticeably worse fuel economy (fuel leakage causing increased actual injection quantity)
- Black Smoke from Exhaust — Incomplete combustion; black smoke from exhaust (abnormal injection timing or quantity)
| Brand | Model | Engine | Years | Notes |
|---|---|---|---|---|
| ISUZU | FVR | 6HK1 / 6UZ1-TC | — | Primary fitment |
| ISUZU | FTR | 6HK1 | — | Primary fitment |
| ISUZU | NPR | 4HK1 | — | Primary fitment |
| ISUZU | NPR-HD | 4HK1 | — | Primary fitment |
| ISUZU | NPR-XD | 4HK1 | — | Primary fitment |
| ISUZU | NQR | 4HK1 | 2013-2019 | Primary fitment |
| ISUZU | NRR | 4HK1 | — | Primary fitment |
| Brand | Model | Engine | Notes |
|---|---|---|---|
| HITACHI | ZAX330-3 / ZX330 | 6HK1 | Primary fitment |
| HITACHI | ZX450-3 | 6WG1 / 6UZ1 | Compatible fitment |
- The high-pressure pump oil seal is a critical sealing component of the high-pressure fuel system — failure causes fuel leakage and power loss, and may pose a fire hazard
- Recommended to replace fuel line sealing gaskets and related O-rings simultaneously when replacing the oil seal
- Use special tools during installation — avoid hammering which may damage the sealing lip
- Apply appropriate fuel system grease to the sealing lip before installation
- Check fuel system pressure and bleed air from the system after installation
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
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