Cylinder Head Cover Gasket 8-98181200-0 8981812000 For ISUZU NPR/NKR/NLR85/NMR85 4JJ1 3.0L Diesel — OEM "GASKET; HD TO COVER" 15-Hole Seal
| OEM Part Number: | 8-98181200-0 / 8981812000 | Part Name: | GASKET; HD TO COVER / Valve Cover Gasket / Cylinder Head Cover Gasket |
| Fitting Position: | Between Valve Cover And Cylinder Head | Bolt Holes: | 15 Holes |
| Engine Compatibility: | ISUZU 4JJ1, 4JJ1-T, 4JJ1 E5/E6 | Vehicle Models: | ISUZU NPR, NKR, NLR85, NMR85, ELF |
| Material: | High-Quality OEM Specification | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 12 Months | ||
| High Light: | ISUZU NPR cylinder head cover gasket,4JJ1 3.0L diesel engine gasket,OEM 15-hole cylinder head seal |
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The Valve Cover Gasket (GASKET; HD TO COVER) with OEM number 8-98181200-0 (also listed as 8981812000) is a verified OEM-grade direct replacement for ISUZU 4JJ1 diesel engines. Commonly known as a rocker cover gasket or cylinder head cover gasket, this component provides a critical seal between the valve cover and the cylinder head, preventing engine oil leakage and protecting the valvetrain from contamination.
The 4JJ1 is a 3.0L turbo-diesel engine renowned for its durability in commercial trucks, including the ISUZU NPR, NKR, NLR85, NMR85, and ELF series. This gasket is an essential component for maintaining the integrity and performance of the engine, designed to withstand the high temperatures and continuous vibration of commercial vehicle operation. This gasket features a 15-hole design for precise fitment on the 4JJ1 cylinder head.
If your valve cover gasket is failing, you may experience one or more of the following symptoms:
- Engine Oil Leakage: Oil spots or puddles forming under the vehicle
- Burning Oil Smell: Oil dripping onto hot exhaust components, producing a burning odor
- Low Engine Oil Level: Unexplained drop in oil level between service intervals
- Oil Residue on Engine Block: Visible oil stains or wetness around the valve cover area
- Engine Misfire or Rough Running: In severe cases, oil contamination of sensors can cause rough operation
A failing valve cover gasket can lead to progressive oil loss, a dirty engine, and potential engine damage — prompt replacement is essential.
| Part Number | 8-98181200-0 8981812000 |
|---|---|
| Product Name | Cylinder Head Cover Gasket |
| Car Model | ISUZU NPR/NKR/NLR85/NMR85 |
| Engine Model | ISUZU 4JJ1 |
| Condition | 100% Brand New |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
CRITICAL: This gasket is specifically designed for ISUZU 4JJ1 engines with a 15-hole valve cover pattern.
| Brand | Model | Chassis / Series | Engine | Notes |
|---|---|---|---|---|
| ISUZU | NPR | N-Series | 4JJ1 3.0L Diesel | Primary application |
| ISUZU | NKR | N-Series | 4JJ1 3.0L Diesel | Compatible |
| ISUZU | NLR85 | N-Series | 4JJ1 3.0L Diesel | Compatible |
| ISUZU | NMR85 | N-Series | 4JJ1 3.0L Diesel | Compatible |
| ISUZU | ELF | N-Series | 4JJ1 3.0L Diesel | Compatible |
| Engine Code | Notes |
|---|---|
| 4JJ1 | Base engine |
| 4JJ1-T | Turbocharged variant |
| 4JJ1 E5 / E6 | Euro 5 / Euro 6 emission compliant variants |
- This valve cover gasket is specifically designed for ISUZU 4JJ1 series engines only
- The 15-hole design is critical for correct fitment — verify your valve cover bolt count before ordering
- Please verify your vehicle's chassis code, production year, and engine code before ordering
| Feature | Benefit + Verification Signal |
|---|---|
| OEM Specification — ISUZU Genuine Equivalent | Guarantees factory-fit quality and performance — verified by OEM part numbers 8-98181200-0 and 8981812000 |
| Precision 15-Hole Design | Matches the 15-bolt valve cover pattern of the 4JJ1 engine for a perfect seal |
| Single-Use Component | This gasket must be replaced whenever the cylinder head cover is removed |
| Prevents Engine Oil Leakage | Seals the connection between the valve cover and cylinder head, protecting the engine core from contamination |
| Genuine OEM Quality | Manufactured to ISUZU's stringent quality standards — 100% brand new, not aftermarket or refurbished |
| Direct Replacement Fitment | No modifications required — engineered as a direct match for the original gasket |
| 100% New — No Core Charge | Guarantees zero wear, immediate sealing performance, and full service life — no core deposit required |
As an OEM-grade part, each valve cover gasket meets ISUZU's stringent quality standards.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 15-hole pattern and sealing surface dimensions match OE blueprint specifications |
| Material Composition | High-quality material analysis to verify heat resistance and durability |
| Hardness Testing | Shore hardness testing to verify sealing performance under compression |
| Oil Resistance Test | Extended exposure to high-temperature engine oil to verify material integrity |
| Durability Cycle Test | 500+ hour thermal cycling to verify long-term reliability under heavy-duty operation |
| Final Assembly Inspection | 100% visual and dimensional inspection before packaging |
IMPORTANT: Professional Installation Recommended
- Allow the engine to cool completely before starting work
- Disconnect the negative battery terminal
- Clean the area around the valve cover to prevent contamination
- CRITICAL: Verify your valve cover has 15 bolt holes — this gasket is specifically designed for the 15-hole pattern
- CRITICAL: This is a single-use component — must be replaced whenever the cylinder head cover is removed
- Inspect the valve cover for cracks or warpage — replace if necessary
(Reference ISUZU workshop manual):
- Disconnect the negative battery terminal
- Remove the engine cover and any components blocking access to the valve cover
- Remove the 15 valve cover mounting bolts in the correct sequence
- Carefully remove the valve cover and old gasket
- CRITICAL: Clean the valve cover and cylinder head sealing surfaces thoroughly with appropriate solvent
- Ensure both surfaces are completely dry and free of oil residue
- CRITICAL: Position the new gasket correctly on the valve cover or cylinder head
- Install the valve cover and hand-tighten the 15 mounting bolts
- CRITICAL: Torque the mounting bolts in the correct sequence to the manufacturer's specified torque settings (refer to ISUZU workshop manual)
- Reconnect the negative battery terminal
- Start the engine and check for oil leaks around the gasket area
- Check the oil level after the engine reaches operating temperature
- Inspection: Every 50,000 km / 12 months, or during routine oil changes. Check for visible oil leaks around the valve cover area
- Replacement: Immediately if oil leaks are detected or if the gasket shows signs of deterioration
- Note: This gasket is typically replaced during valve clearance adjustments or when removing the rocker cover for valvetrain service. Using an uncertified gasket may void your Isuzu warranty
- Packaging: Each valve cover gasket is securely packed in protective packaging to prevent shipping damage
- Availability: Stock available with 258 units in inventory
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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