OEM-Grade Polymer Coolant Reservoir Expansion Tank for Toyota Coaster BB42 with Heat, UV, and Glycol Resistance
Key Attributes
Product Summary
OEM-grade coolant reservoir expansion tank 16470-17061 for Toyota Coaster BB42, BB4#, BB5#, BZB40, BZB50, HZB50, RZB40 chassis with 14B, 15B, 1HZ diesel engines. Direct replacement with heat/UV/glycol-resistant polymer construction, factory mounting points, and translucent body for easy level checking. Restores cooling system integrity and prevents secondary component damage.
Product Details
Toyota Coaster BB42 coolant reservoir
,OEM-grade polymer expansion tank
,UV-resistant coolant reservoir Toyota
| Part Number: | 16470-17061 | Product Name: | Coolant Reservoir Expansion Tank |
| Car Model: | Toyota Coaster BB42 | Engine Model: | Toyota 14B 15B 1HZ |
| Condition: | 100% Brand New | Origin: | China Mainland |
| Material: | High-strength polymer | Installation: | Direct OEM replacement |
| Chassis | Engine | Years / Notes |
|---|---|---|
| BB4# (including BB42) | 14B, 15B | 1990s-2000s diesel variants |
| BB5# | 14B, 15B | Later production |
| BZB40, BZB50 | 15BFT, 1BZFPE | Coaster bus |
| HZB50 | 1HZ | 4.2L diesel variant |
| RZB40 | 2TR, other petrol variants | Coaster bus |
- Cracking at seams - Plastic becomes brittle after years of heat cycling
- Cracked hose fittings - Causes slow coolant loss
- Cap seal failure - Allows system pressure loss, reducing coolant boiling point
- Internal contamination - Sludge buildup from old coolant
| Symptom | Diagnosis |
|---|---|
| Coolant puddle under engine bay | Cracked expansion tank - inspect for visible cracks |
| Persistent low coolant level | Slow leak from cracked tank or hose fitting |
| Engine temperature rising on climbs | Insufficient coolant in system |
| Visible cracks or brittleness | Plastic degradation - replacement required |
- Direct OE Replacement - Exact Toyota part number 16470-17061, direct bolt-on installation
- OEM-Grade Polymer Construction - Heat-, UV-, and glycol-resistant material
- Translucent Body - Easy coolant level checking against MIN/MAX marks
- Comprehensive Coverage - One part fits multiple Coaster chassis configurations
- Restores System Integrity - Maintains proper pressure balance in cooling loop
- Prevents Component Damage - Protects water pump, hoses, and cylinder head gasket
| QC Item | Verifiion Method |
|---|---|
| Material composition | Spectrographic analysis - confirmed to OEM specifiion |
| Dimensional accuracy | CMM measurement - exact fitment verifiion |
| Pressure integrity | Pressure tested at 1.5 bar - zero leakage |
| Thermal cycling | Sample tested from -30°C to +120°C |
| Visual inspection | 100% - no voids, cracks, or defects |
| Service Item | Interval |
|---|---|
| Check coolant level in expansion tank | Daily (walk-around inspection) |
| Inspect expansion tank for cracks or leaks | Every service interval (10,000-20,000 km) |
| Replace engine coolant | Every 2-3 years or 40,000-60,000 km |
- Individual packaging: Protective foam-lined carton
- Master carton: 20 units per export carton
- Lead time: 3-7 working days for stock orders
- Minimum order: 1 piece (sample available)
- Shipping: FedEx, UPS, DHL for samples; sea freight for bulk
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