ISUZU Cylinder Head Rubber Plug OEM Standard Design Heat-resistant Oil-resistant Rubber for 6HE1 4HK1 4HF1 4HG1 6HK1 Engines
| Installation Position: | Between Cylinder Head Cover And Cylinder Head | Material: | Heat-resistant, Oil-resistant Rubber |
| Compatible Engines: | ISUZU 6HE1, 4HK1, 4HF1, 4HG1, 6HK1 | Model Years: | 1994–2026 |
| Reference Format: | 8-94399-605-0 | OEM Part Number: | 8-94399605-0 / 8943996050 |
| High Light: | Heat-resistant Oil-resistant Rubber Cylinder Head Rubber Plug,OEM Standard Design Valve Cover Rubber Plug,Compatible with ISUZU 6HE1 Half-moon Seal |
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The ISUZU Cylinder Head Rubber Plug with OEM numbers 8-94399605-0 / 8943996050 is a precision-engineered replacement designed for ISUZU FVR and 700P series heavy/medium-duty trucks, compatible with 6HE1 diesel engines. This component serves as a core sealing part of the engine — the Cylinder Head Rubber Plug — responsible for sealing openings in the cylinder head cover to prevent oil leaks and contamination.
The cylinder head rubber plug (also known as "valve cover rubber plug" or "half-moon seal") is a sealing component installed on the cylinder head cover. Its working principle includes:
- Oil Sealing: Creates reliable seal at cover openings to prevent oil leakage
- Heat Resistance: Manufactured from specialized heat-resistant and oil-resistant rubber materials
- Contaminant Prevention: Prevents external dust, moisture, and contaminants from entering valve train area
- Tolerance Compensation: Rubber elasticity compensates for manufacturing tolerances and thermal expansion
Inspect immediately if any of these symptoms occur:
| Symptom | Probable Cause |
|---|---|
| Visible oil leakage around cylinder head cover | Hardened, cracked, or damaged rubber plug |
| Increased oil consumption without blue smoke | Oil leaking from plug, not entering combustion chamber |
| Hardened, cracked, swollen, or deformed plug | Material aging from long-term high-temperature exposure |
| Burning oil smell during engine operation | Leaked oil dripping onto hot exhaust components |
| Loose cylinder head cover bolts | Seal failure due to compressed or deformed plug |
| Part Number: | 8-94399605-0 8943996050 |
| Product Name: | Cylinder Head Rubber Plug |
| Car Model: | FVR 6HE1 |
| Engine Model: | 700P |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Markets: | Middle East, Asia, Africa, South America, North America & Europe |
| Quality Standard: | OEM equivalent / ISO quality control |
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | FVR | 6HE1 | Heavy-duty truck |
| ISUZU | 700P | 6HE1 | Medium-duty truck |
| ISUZU | ELF700P | 4HK1 / 6HK1 / 4HF1 / 4HE1 / 4HG1 | Light-duty truck |
| ISUZU | NPR66 | 4HF1 | Light/medium-duty truck |
| ISUZU | NPR70 | 4HE1 | Light/medium-duty truck |
| ISUZU | NQR70 | 4HE1 | Medium-duty truck |
| ISUZU | NPR71 | 4HG1 | Light/medium-duty truck |
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | NRR | 4HK1 | Medium-duty truck |
| ISUZU | NPR | 4HK1 | Light/medium-duty truck |
| ISUZU | NQR | 4HK1 | Medium-duty truck |
| ISUZU | NPR-HD | 4HK1 | Heavy-duty NPR variant |
- Number Confirmation: Verify specific number on original part before ordering
- Surface Cleaning: Thoroughly clean mating surfaces before installation
- Position Confirmation: Confirm correct position during installation
- Professional Installation: Critical engine sealing component — professional installation recommended
Manufactured to ISUZU original specifications — ensures perfect fitment
Excellent resistance for long-term reliable operation under high temperatures
20 years experience with over 400 supplier network
Every piece undergoes strict quality inspection before shipment
Fits multiple ISUZU models and engine types
MOQ 10 pieces, delivery 7–30 days
| QC Item | Inspection Method | Acceptance Criterion | Frequency |
|---|---|---|---|
| Dimensional accuracy | Special gauges / CMM | OEM standard size | Batch sampling |
| Rubber material hardness | Shore durometer | Standard hardness range | Batch sampling |
| Material temperature resistance | High/low temperature chamber | Per heat-resistant standard | Annual sampling |
| Material oil resistance | Oil immersion test | Per oil-resistant standard | Annual sampling |
| Sealing performance | Pressure test bench | No leakage; stable pressure retention | Batch sampling |
| Visual inspection | Visual | No cracks, bubbles, or deformation | 100% |
| Function test | Special inspection equipment | 100% tested | 100% |
Preparation:
- Confirm engine model and part number (8-94399605-0)
- Prepare tools: Socket wrench, scraper, cleaner
- Recommended to also prepare: Cylinder head cover gasket
Installation Sequence:
- Park vehicle on level surface, engage parking brake, allow engine to cool
- Remove accessories from cylinder head cover
- Remove cylinder head cover and old rubber plug
- Thoroughly clean mating surfaces
- Inspect new plug for defects
- Install new plug in designated opening
- Position cylinder head cover with proper alignment
- Torque bolts to specification in correct sequence
- Reinstall all removed accessories
| Item | Interval | Notes |
|---|---|---|
| Cylinder head cover leak check | Every 10,000 km / each service | Check for oil seepage around cover |
| Rubber plug visual inspection | Every 20,000 km | Check for hardening, cracking, swelling, or deformation |
| Rubber plug replacement | Upon aging/damage | — |
| Packaging: | Neutral packaging or customized per customer request |
| Quantity per package: | 1 pc/box (standard shipment packaging) |
| Brand: | IZUMI / BZLP |
| Place of Origin: | China |
| Minimum Order Quantity: | Typically 10 pieces |
| Delivery Time: | 7–30 days |
| Payment Terms: | T/T, Western Union |
| Warranty: | Per supplier policy |
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