Radiator Inlet Water Hose 1-21437757-0 121437-7570 For ISUZU FVR34/FVZ34 6HK1 7.8L Diesel — OEM Metal Coolant Pipe Assembly
| OEM Part Number: | 1-21437757-0 / 1214377570 / 121437-7570 | Part Name: | Radiator Inlet Water Hose / Water Pipe On The Water Tank / Coolant Supply Pipe |
| Engine Compatibility: | ISUZU 6HK1, 6HK1-TC | Vehicle Models: | ISUZU FVR34, FVZ34 |
| Material: | Corrosion-Resistant High-Strength Alloy With Industrial Protective Coating | Operating Temperature Range: | -40°C To 135°C |
| Color: | Black / Metallic Finish | HS Code: | 400931000 |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | ISUZU FVR34 radiator inlet hose,OEM metal coolant pipe assembly,6HK1 diesel engine water hose |
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The Radiator Inlet Water Hose (Water Pipe On The Water Tank) with OEM numbers 1-21437757-0 (also listed as 1214377570, 121437-7570) is a verified OEM-grade direct replacement for ISUZU FVR34 and FVZ34 heavy-duty trucks equipped with the 6HK1 7.8L diesel engine.
Precision-engineered metal coolant pipe delivers consistent flow and reliable sealing under high pressure — verified against ISUZU OEM specifications for 6HK1 engines.
Constructed from corrosion-resistant high-strength alloys with industrial protective coating — capable of withstanding operating temperatures from -40°C to 135°C and resisting rust, chemical erosion, and oxidation.
99% direct bolt-on fitment — engineered with precise OEM tolerances for seamless, vibration-resistant fit.
Replaces 1-21437757-0, 1214377570, 121437-7570.
If your radiator inlet water hose is failing, you may experience one or more of the following symptoms:
- Coolant Leakage: Visible coolant dripping or pooling under the vehicle near the radiator or engine
- Engine Overheating: Temperature gauge consistently rising above normal
- Low Coolant Level: Unexplained drop in coolant level with no visible external leaks
- Steam from Engine Bay: Steam or vapour rising from the radiator area
- Coolant Odor: Sweet smell of coolant in the engine bay or cabin
| Part Number | 1-21437757-0 121437-7570 |
| Product Name | Radiator Inlet Water Hose |
| Car Model | ISUZU FVR34/FVZ34 |
| Engine Model | ISUZU 6HK1 |
| Condition | 100% Brand New |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model | Chassis / Series | Engine | Notes |
|---|---|---|---|---|
| ISUZU | FVR34 | FORWARD 18.0 | 6HK1 7.8L Diesel | Primary application |
| ISUZU | FVZ34 | Heavy-Duty Truck | 6HK1 7.8L Diesel | Compatible |
| ISUZU | FVR | FORWARD Series | 6HK1-TC | Compatible |
| ISUZU | NPR / NKR | N-Series | 6HK1 | Compatible |
| ISUZU | ELF | N-Series | 6HK1 | Compatible |
- Designed for ISUZU 6HK1 and 6HK1-TC diesel engines
- Compatible with ISUZU FVR34, FVZ34, FORWARD series, and N-Series trucks
- This is a metal coolant pipe assembly — not a rubber hose
- Verify your vehicle's chassis code, production year, and engine code before ordering
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify all mounting points match OE blueprint specifications |
| Material Composition | High-strength alloy analysis with corrosion-resistant coating verification |
| Pressure Test | 100% pressure testing to guarantee zero coolant leakage under operating conditions |
| Temperature Cycle Test | 500+ hour thermal cycling from -40°C to 135°C to verify long-term reliability |
| Corrosion Resistance Test | Salt spray and chemical exposure testing to verify protective coating integrity |
| Final Assembly Inspection | 100% visual and dimensional inspection before packaging |
Replacing the radiator inlet water pipe requires proper coolant drainage, correct torque specifications, and thorough system inspection.
- Allow the engine to cool completely before starting work
- Drain the cooling system or position a drain pan to catch coolant spillage
- Clean the area around the pipe connections to prevent contamination
- Inspect all rubber hoses, clamps, and radiator connection for wear or damage
- Use new O-rings or seals if required by the workshop manual
- Ensure the engine is completely cool and drain the cooling system
- Disconnect the negative battery terminal
- Remove the radiator inlet pipe from the vehicle
- Remove the old pipe and clean the mounting surfaces thoroughly
- CRITICAL: Install the new pipe with new seals and gaskets
- Torque the mounting bolts to manufacturer's specified torque settings
- Reconnect all coolant hoses and connections securely
- CRITICAL: Refill the cooling system with correct coolant mixture and bleed air
- Start the engine and allow it to reach operating temperature
- Check for coolant leaks around the pipe connections
- Verify the cooling system operates correctly
- Inspection: Every 50,000 km / 12 months
- Coolant Replacement: Every 2 years or 40,000 km
- Replacement: Immediately if failure symptoms appear
| Packaging | Neutral box, color box, or customer brand package |
| Pack Quantity | 1 PC |
| HS Code | 400931000 |
| MOQ | Small quantity accepted; quantity discounts available |
| Delivery Time | 15-20 days after deposit |
| Payment Terms | T/T, WESTERN UNION, CHINESE BANK |
| Place of Origin | Japan |
| Suitable For | Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners |
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