Thermostat Hose Pipe 8-97379228-1 8973792281 For ISUZU 700P NPR NQR NRR 4HK1 5.2L Diesel — OEM Verified Direct Fit, Water Bypass Coolant Hose
| OEM Part Number: | 8-97379228-1 / 8973792281 | Part Name: | Thermostat Hose Pipe / Water Bypass Hose |
| Engine Compatibility: | ISUZU 4HK1 (5.2L Turbo Diesel) | Vehicle Models: | ISUZU 700P, NPR, NPR-HD, NQR, NRR |
| Material: | Heavy-duty Black Rubber | Function: | Water Bypass — Routes Coolant Around Thermostat When Closed |
| Weight: | 0.08 Kg | HS Code: | 400931000 |
| Condition: | Brand New — 100% Pressure Tested | Warranty: | 12 Months |
| High Light: | ISUZU 700P thermostat hose pipe,OEM verified coolant bypass hose,4HK1 5.2L diesel engine hose |
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The Thermostat Hose Pipe with OEM numbers 8-97379228-1 / 8973792281 is a verified direct-fit replacement for ISUZU 700P, NPR, NPR-HD, NQR, and NRR series trucks equipped with the 4HK1 (5.2L) diesel engine. This critical cooling system component routes coolant as a water bypass hose, ensuring proper engine warm-up and preventing hot spots.
- Material & Construction: Heavy-duty black rubber designed for excellent heat resistance and durability
- Fitment Verification: Confirmed fitment across ISUZU NPR, NPR-HD, NQR, NRR, and 700P models with 4HK1 5.2L engine (2007-2010)
- Dimensional Weight: 0.08 kg — lightweight, precision-molded design
- OEM Cross-Reference: Replaces 8-97379228-1, 8973792281, 8-97379-228-1, and cross-referenced with 8980969910
- Multi-Market Application: Compatible with ISUZU platforms across Middle East, Asia, Africa, South America, North America & Europe
- Coolant leaks: Visible drips or puddles under vehicle, low coolant levels
- Engine overheating: Temperature gauge rising above normal operating range
- Cracked, spongy, or hardened hose: Visual degradation, swelling, or stiffness
- Coolant residue or white staining: Dried coolant traces around connections
- Loose or brittle hose clamps: Clamps that no longer hold tension
| Part Number: | 8-97379228-1 8973792281 |
| Product Name: | Thermostat Hose Pipe |
| Car Model: | ISUZU 700P NPR NQR NRR |
| Engine Model: | ISUZU 4HK1 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
| Brand | Model / Series | Engine | Years |
|---|---|---|---|
| ISUZU | 700P | 4HK1 / 4HK1-T | 2007-2010+ |
| ISUZU | NPR | 4HK1 | 2007-2010 |
| ISUZU | NPR-HD | 4HK1 | 2007-2010 |
| ISUZU | NQR | 4HK1 | 2007-2024 |
| ISUZU | NRR | 4HK1 | 2007-2010 |
Important Fitment Notes:
- Also known as water bypass hose and cylinder block water inlet hose
- Specifically designed for 4HK1 platform - verify engine variant before ordering
- Always inspect thermostat, water pump, and other radiator hoses when replacing
- Verify OEM number against engine tag or vehicle documentation
Withstands high-temperature coolant circulation and pressure pulsation
Direct replacement with correct bends and end diameters
Manufactured from black rubber for engine coolant temperatures
Easy installation and reduced stress on connection points
One hose covers multiple ISUZU platforms
Direct bolt-on replacement without modification
| QC Item | Verification Method |
|---|---|
| Inner diameter / outer diameter | Precision gauge measurement against OEM drawing |
| Hose length / bend geometry | Dimensional inspection |
| Material hardness | Shore A durometer testing |
| Burst pressure resistance | Hydrostatic pressure test |
| Temperature cycling | Thermal cycle testing |
| Coolant chemical resistance | Immersion test in coolant solution |
| Surface finish & visual defects | Visual inspection for cracks, blisters, or contamination |
Each unit undergoes 100% quality inspection before packaging. Manufacturing conforms to OEM specification standards for cooling system hose applications.
IMPORTANT SAFETY: Allow engine to cool completely before removing radiator cap or cooling system components. Pressurized hot coolant can cause severe burns. Dispose of used coolant according to local environmental regulations.
Installation Guidelines:
- Drain coolant completely using drain pan
- Remove old hose by loosening clamps and twisting to break seal
- Clean mating surfaces and inspect for corrosion or debris
- Install new thermostat bypass hose, ensuring proper routing
- Secure clamps to specification without over-tightening
- Refill with recommended coolant mixture and bleed system
- Pressure test by running engine to operating temperature
Maintenance Schedule:
- Inspect thermostat hose every 40,000-50,000 km or annually
- Replace immediately if showing cracks, swelling, hardening, or weeping
- Replace coolant every 2 years or 50,000 km (conventional coolant)
- Inspect all cooling system hoses when replacing one component
- Standard packing: Neutral packaging in carton; original packaging available
- Suitable for: Truck repair workshops, fleet maintenance, spare parts distributors, export wholesalers
- Related parts available: Complete 4HK1 cooling hose set, thermostat, water pump, radiator cap
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