Corrosion-resistant aluminium alloy oil cooler assembly with plate-type heat exchanger for Toyota 1HZ 4.2L diesel engine OEM specifiion
Corrosion-resistant aluminium alloy oil cooler assembly with plate-type heat exchanger for Toyota 1HZ 4.2L diesel engine OEM specifiion
Key Attributes
Brand Name:YIMI
Model Number:Toyota Land Cruiser 70/80 Coaster 1HZ
Place of Origin:China
Minimum Order Quantity:10 pcs
Price:Negotiable
Supply Ability:10000 pcs/month
Delivery Time:5-8 Work Days
Payment Terms:T/T,
Standard Packaging:Neutral Package or as customers’ request
Product Summary
OEM-spec oil cooler assembly 15710-17010 for Toyota 1HZ 4.2L diesel engines in Land Cruiser 70/80 Series and Coaster vehicles. Plate-type heat exchanger maintains optimal oil temperature, prevents oil-coolant cross-contamination, and protects engine longevity. Direct replacement manufactured in IATF 16949/ISO 9001 certified facility.
Product Details
Highlight:
Corrosion-resistant aluminium alloy oil cooler
,Toyota 1HZ diesel engine oil cooler
,Plate-type heat exchanger oil cooler
Construction:
Plate-type Heat Exchanger With Multiple Cooling Plates
Housing Material:
Corrosion-resistant Aluminium Alloy
Cooling Type:
Liquid-to-liquid (oil-to-coolant)
Weight:
Approximately 2.5–3.0 Kg
Engine Compatibility:
Toyota 1HZ (4.2L Inline-six Diesel), 1HD Series
Bore:
94.0 Mm
Stroke:
100.0 Mm
Carton Dimensions:
28 × 20 × 15 Cm
Product Description
Detailed Specifications & Features
Oil Cooler Assembly 15710-17010 For Toyota Land Cruiser 70/80 Coaster 1HZ 4.2L Diesel
The oil cooler assembly carrying Toyota OEM number 15710-17010 is a direct factory-spec replacement for the engine oil cooler on the Toyota 1HZ 4.2L inline-six diesel engine. This component is fitted to a wide range of Toyota's most durable commercial and off-road vehicles, including the Land Cruiser 70 Series, Land Cruiser 80 Series, and Coaster bus.
Product Specifiions
Part Number:
15710-17010
Product Name:
Oil Cooler Assembly
Car Model:
Toyota Land Cruiser 70/80 Coaster
Engine Model:
Toyota 1HZ
Condition:
100% Brand New
Origin:
China Mainland
Material:
High-strength aluminum alloy & precision bearings
Cooling Type:
Engine coolant circulation
Installation:
Direct OEM replacement
Quality Standard:
OEM equivalent / ISO quality control
Vehicle & Engine Appliions
This Toyota 1HZ oil cooler assembly 15710-17010 directly replaces the factory component in the following configurations:
| Vehicle Model | Chassis | Engine | Production Period |
|---|---|---|---|
| Toyota Land Cruiser 70 Series | HZJ70, HZJ71, HZJ73, HZJ77 | 1HZ 4.2L diesel | 05.1993 - 08.1999 |
| Toyota Land Cruiser 70 Series | HZJ73HV | 1HZ 4.2L diesel | 11.1990 - 05.1993 |
| Toyota Land Cruiser 80 Series | HZJ80, HDJ80 | 1HZ / 1HD-T 4.2L diesel | 01.1990 - 01.1995 |
| Toyota Coaster Bus | HZB40, HZB50 | 1HZ 4.2L diesel | 07.1999 - 03.2001 |
Additional appliions confirmed by Toyota EPC data:
- Land Cruiser HZJ81V
- Coaster HZB60, HZB70
- Coaster HZB41, HZB40
Important fitment note: This oil cooler is also compatible with the 1HD-T and 1HD-FT turbo diesel engines, which share the same oil cooler architecture as the 1HZ. However, always verify fitment by matching your original part number or consulting the Toyota EPC for your specific chassis code and production date.
Why the 1HZ Oil Cooler Fails
The Toyota 1HZ engine is legendary for its durability. The oil cooler, however, is a serviceable component that can fail over time - particularly on high-mileage vehicles exceeding 300,000 km.
Common failure modes include:
- Internal gasket failure: The sealing rings between the oil cooler and the engine block degrade over time, allowing oil to leak into the coolant system or coolant to enter the oil system.
- Clogged coolant passages: Scale, corrosion, and debris accumulation inside the oil cooler's coolant passages reduces heat transfer efficiency.
- External corrosion: The aluminium housing can corrode externally, particularly in vehicles exposed to road salt or coastal environments.
- Relief valve failure: The oil cooler relief valve can stick or fail, allowing oil to bypass the cooler entirely.
Features & Benefits
- Plate-Type Heat Exchanger Design: Efficient oil cooling with large surface area for heat transfer in a compact package
- Prevents Oil-Coolant Cross-Contamination: Restores critical separation between oil and coolant systems
- Corrosion-Resistant Aluminium Alloy Housing: Provides resistance to coolant additives and thermal cycling
- Direct OE Replacement: No modifiions, adapters, or additional fabriion required
- Comprehensive OE Interchange Coverage: Interchangeable with 15710-17020, 15710-17011, and 15710-17021
- Proven on Legendary 1HZ Engine Platform: Critical component for achieving engine longevity of 500,000+ km
- IATF 16949 / ISO 9001 Certified Manufacturing: Highest standard for automotive component production
Quality Control & Verifiion
| QC Item | Verifiion Method |
|---|---|
| Housing casting integrity | Visual and pressure decay test - no porosity, cracks, or voids |
| Coolant passage flow | Flow bench measurement - meets Toyota cooling system specifiion |
| Oil passage flow | Flow bench measurement - meets Toyota lubriion system specifiion |
| Internal leak integrity | Pressure test on both oil and coolant circuits - zero cross-leakage |
| Gasket sealing surface flatness | Dial gauge measurement - flatness within 0.1 mm |
| Thread and port inspection | Go/no-go gauge for coolant and oil line fittings |
| Full functional test (batch sampling) | Random 2-5% of each batch tested on circulation loop at operating temperature |
Installation & Maintenance Recommendations
⚠️ IMPORTANT: The 1HZ oil cooler is loed on the side of the engine block and is connected to both the engine oil system and the coolant system. When replacing the oil cooler, the oil cooler gasket (Toyota OE: 15785-66010) and sealing rings must also be replaced - never reuse old seals. Coolant and engine oil should be drained before removal and replaced with fresh fluids after installation.
When to replace this oil cooler (1HZ-specific symptoms):
| Symptom | Diagnosis |
|---|---|
| Milky residue in coolant overflow bottle or radiator | Oil has entered the coolant system - internal oil cooler failure |
| Oil on the dipstick appears milky or frothy | Coolant has entered the oil system - internal oil cooler failure |
| Coolant loss without visible external leak | Coolant entering the oil system through failed cooler internal seals |
| Engine overheating under load | Reduced heat transfer efficiency - clogged or failed cooler |
| Erratic oil pressure readings | Restricted oil flow through cooler passages |
Installation Steps (High-Level - Refer to Toyota Workshop Manual for Complete Details):
- Drain the engine oil and coolant completely
- Remove the oil filter, oil lines, and coolant lines from the oil cooler assembly
- Remove the oil cooler mounting bolts and carefully withdraw the assembly from the engine block
- Thoroughly clean the mounting surface on the engine block
- Compare the new oil cooler with the old unit - verify port loions and dimensions
- Install new sealing rings and the oil cooler gasket (Toyota OE: 15785-66010)
- Install the new oil cooler assembly onto the engine block and torque mounting bolts to specifiion
- Reconnect the oil lines and coolant lines - use new sealing washers where specified
- Refill the engine with fresh engine oil and coolant to correct levels
- Start the engine and check for leaks at all connections
- Run the engine to operating temperature and verify oil pressure and coolant temperature
- Check for any milky residue in the coolant or oil
Maintenance schedule for 1HZ oil cooler systems:
| Service Item | Interval |
|---|---|
| Inspect oil cooler for external leaks or corrosion | At every oil change (every 5,000-10,000 km) |
| Replace engine coolant | Every 2 years or 40,000 km |
| Check coolant and oil for cross-contamination | Monthly - early detection prevents astrophic engine damage |
| When oil cooler is removed for any reason | Always replace oil cooler gasket and sealing rings |
Packaging & Supply
- Individual packaging: Sealed in anti-static VCI bag, foam-lined carton
- Carton dimensions: Approximately 28 × 20 × 15 cm
- Net weight: Approximately 2.5-3.0 kg
- Master carton: 20 units per export carton (palletisable)
- Lead time: 3-7 working days for stock orders; 15-25 days for production orders above 100 pieces
- Minimum order quantity: 1 piece (sample order available)
- Shipping methods: FedEx, UPS, DHL for sample quantities; sea freight from major Chinese ports
- H/S Code: 8409.91
For workshops performing a full cooling system service, the supplier also stocks matching oil cooler gaskets (15785-66010), sealing rings, and relief valves (15690-64011) for the 1HZ engine family.
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