Durable Rubber / ACM Material Head To Cover Gasket for ISUZU NKR NPR 4HK1 with OEM Part Number 8973313590
| Operating Temperature: | -40°C To +150°C | Material: | Durable Rubber / ACM (polyacrylate Rubber) |
| Seal Type: | Static Seal | Engine Compatibility: | 4HK1 5.2L Diesel Engine |
| Sealing Pressure: | 5–7bar | Installation Success Rate: | 98.5% Direct Fitment Rate |
| Oil Resistance: | Resists Swelling, Hardening, And Degradation | Hardness Test: | Meets Rubber Hardness Standard |
| High Light: | Durable Rubber Valve Cover Gasket,High Temperature Engine Gasket,OEM 8973313590 Head To Cover Gasket |
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Head To Cover Gasket 8973313590 8-97331359-0 for ISUZU NKR NPR 700P 4HK1 5.2L — OEM Quality
The Head To Cover Gasket (Valve Cover Gasket) with OEM numbers 8973313590 / 8-97331359-0 (associated number 8973313591 / 8-97331359-1) is a verified direct-fit replacement for ISUZU 4HK1 5.2L diesel engines. This gasket is installed between the cylinder head and valve cover, serving as a critical component of the engine's top sealing system, widely used in ISUZU NKR / NPR / NQR / NRR / 700P series trucks.
The Head To Cover Gasket (Valve Cover Gasket) is installed between the cylinder head and valve cover, made from durable rubber or ACM (polyacrylate rubber) materials. Its core function is to create a reliable static seal between the valve cover and cylinder head, preventing high-temperature engine oil from leaking through the valve cover mating surface. Additionally, the gasket prevents external contaminants such as dust and moisture from entering the engine, protecting the valve train components (camshaft, rocker arms, valve springs, etc.) from contamination and ensuring proper lubrication system operation.
- Oil Leak on Top of Engine — Visible oil stains around the valve cover; oil seepage on engine sides or bottom
- Burning Oil Smell — Burning oil odor while driving, caused by oil dripping onto hot exhaust manifold
- Abnormal Oil Consumption — Oil level drops faster than normal; frequent oil top-ups required
- Rough Engine Operation — Oil leaks contaminating spark plugs (gasoline) or sensors, causing engine misfires and rough idling
- Dirty Valve Cover Surface — Accumulation of oil sludge and dirt on the valve cover exterior
- Hardened/Cracked Gasket — Rubber material aged, hardened, and cracked due to prolonged high-temperature exposure, losing sealing elasticity
| Part Number: | 8973313590 8-97331359-0 |
| Product Name: | Head To Cover Gasket |
| Car Model: | NKR NPR |
| Engine Model: | 4HK1 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
| Package: | Neutral Packing Or Make It As Requested |
| Brand | Model | Engine | Years | Notes |
|---|---|---|---|---|
| ISUZU | NKR | 4HK1 5.2L | 2004–2010 | Primary fitment |
| ISUZU | NPR | 4HK1 5.2L | 2004–2010 | Primary fitment |
| ISUZU | NPR-HD | 4HK1 5.2L | 2004–2010 | |
| ISUZU | NQR | 4HK1 5.2L | 2004–2010 | |
| ISUZU | NRR | 4HK1 5.2L | 2004–2010 | |
| ISUZU | 700P | 4HK1-TCS | — | |
| ISUZU | ELF | 4HK1 | — | |
| Chevrolet/GMC | W3500/W4500/W5500 Tiltmaster | 4HK1 5.2L | 2005–2007 |
| Brand | Model | Engine | Notes |
|---|---|---|---|
| HITACHI | ZAX200-3 / ZX200-3 | 4HK1 | |
| HITACHI | ZAX240-3 | 4HK1 | |
| JCB | JCB 220 | 4HK1 | |
| CASE | CX210B / CX230B / CX210C | 4HK1 |
- The head to cover gasket is a critical component of the engine's top sealing system — failure causes oil leaks that can lead to engine damage from oil starvation
- Recommended to replace valve cover seals and related rubber components simultaneously when replacing the gasket
- Must be installed with correct torque and sequence as specified in the workshop manual to prevent uneven sealing
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
| Feature | Benefit + Verification Signal |
|---|---|
| Durable Rubber / ACM Material | Excellent high-temperature and oil resistance for 4HK1 engine environments — operating range -40°C to +150°C for long-term reliable sealing |
| Precision OEM Dimensions | Perfect match with valve cover and cylinder head — direct OEM replacement, no adjustment needed |
| Superior Oil Resistance | Resists swelling, hardening, and degradation from prolonged hot oil exposure — ensures long seal life, reduces repeat repairs |
| Direct OE Fit Replacement | No modification needed for quick installation — 98.5% direct fitment rate confirmed across 89 repair orders |
| Broad Compatibility | Fits ISUZU NKR/NPR/NQR/NRR/700P trucks and HITACHI, JCB, CASE heavy equipment — one gasket, multiple applications |
| 12-Month Warranty | Peace of mind on manufacturing defects — free replacement within warranty period |
| QC Item | Verification Method | Standard |
|---|---|---|
| Material Composition | Spectrographic/IR analysis | Meets rubber/ACM material standard |
| Dimensional Accuracy | Precision gauge / CMM | Meets OEM installation dimension standards |
| Hardness Test | Hardness tester | Meets rubber hardness standard |
| Oil Resistance Test | Oil immersion test | No swelling, no decomposition within specified time |
| Temperature Test | Thermal chamber | -40°C to +150°C — no deformation, no cracking |
| Visual Inspection | 100% visual inspection | No bubbles, cracks, burrs, or surface defects |
IMPORTANT: The head to cover gasket is a critical component of the engine sealing system. Improper installation may cause oil leaks, potentially leading to engine damage. Installation should be performed by qualified professionals.
- Safety Prep — Disconnect battery negative terminal; ensure engine is cooled
- Remove Components — Remove valve cover-related components (fuel lines, wiring harness brackets, breather hoses, etc.)
- Remove Valve Cover — Loosen valve cover bolts in sequence; remove old valve cover
- Clean Sealing Surfaces — Thoroughly clean old gasket residue and oil from valve cover and cylinder head (must be clean for new gasket to seal)
- Inspect Sealing Surfaces — Check valve cover and cylinder head sealing surfaces for scratches, warping, or corrosion
- Install New Gasket — Install new gasket into valve cover groove; ensure fully seated in the groove
- Install Valve Cover — Install valve cover with new gasket onto cylinder head; align all bolt holes
- Tighten Bolts — Torque bolts to workshop manual specification in cross pattern (center outward) in stages (must use torque wrench)
- Reinstall Components — Reinstall all removed components
- Test Run — Start engine; idle and check for oil leaks
| Item | Interval |
|---|---|
| Valve Cover Inspection | Every 20,000 km or 12 months |
| Gasket Inspection | When oil leaks are found or during engine service |
| Gasket Replacement | When leaks, hardening/cracking are found, or must replace whenever valve cover is removed |
- Packaging — Neutral carton / Branded color box / Custom branded packaging
- Packaging Unit — 1 piece/box
- MOQ — 1 piece; volume discounts available
- Target Customers — Truck parts wholesalers, heavy equipment parts suppliers, repair chain stores, fleet purchasers, cross-border e-commerce sellers
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