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Coolant Reservoir Expansion Tank 16470-17061 For Toyota Coaster BB42 14B 15B 1HZ Diesel Engine
Direct OEM replacement coolant reservoir expansion tank with part number 16470-17061 for Toyota Coaster buses equipped with 14B, 15B, and 1HZ diesel engines.
Product Overview
This coolant reservoir expansion tank stores engine coolant overflow from the radiator during thermal expansion and returns it to the system as the engine cools. Essential for maintaining proper cooling system function in demanding bus appliions.
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
Vehicle Appliions
Direct replacement for Toyota Coaster buses with the following configurations:
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
Common Failure Symptoms
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
Features & Benefits
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
Quality Control
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
IMPORTANT SAFETY NOTE:
Never remove the reservoir cap or open the cooling system while the engine is hot. The pressurized system can release hot coolant or steam causing serious burns.
Installation & Maintenance
Recommended Replacement Interval: 150,000-200,000 km or 10-15 years of service
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...