Gear-Driven Air Compressor Assembly with Cast Iron Cylinder for ISUZU 700P 4HK1 Engine 130-145 psi
The air compressor assembly carrying OEM numbers 8-98037146-1 and 8-98286197-0 supplies compressed air to the brake system of ISUZU 700P medium-duty trucks powered by the 4HK1 5.2L common rail turbo-diesel engine. This engine-driven compressor is also found on related N-series chassis including NPR, NQR, NPS, and NKR models equipped with air brake systems.
The 700P chassis is rated for gross vehicle weights up to 10.5 tonnes, which requires a full pneumatic brake system. The engine-mounted air compressor draws air through the intake system, compresses it, and delivers it to the air dryer and reservoir tanks.
Part Number: 8-98037146-1, 8-98286197-0
Product Name: Air Compressor Assembly
Car Model: ISUZU 700P
Engine Model: ISUZU 4HK1
Condition: 100% Brand New
Material: High-strength aluminum alloy & precision bearings
Cooling Type: Engine coolant circulation
Installation: Direct OEM replacement
Quality Standard: OEM equivalent / ISO quality control
This ISUZU air compressor assembly directly replaces the factory unit in the following configurations:
| Chassis / Model | Engine | Years | Notes |
|---|---|---|---|
| ISUZU 700P | 4HK1-TCG40, 4HK1-TCG51, 4HK1-TCG61 | 2005-present | Primary application - medium truck, air brakes |
| ISUZU NPR | 4HK1-TC / 4HK1-TCN | 2005-present | N-series, air brake variants |
| ISUZU NQR | 4HK1 | 2005-present | Medium chassis, air brakes |
| ISUZU NPS | 4HK1-TCS | 2008-present | 4x4 chassis, air brakes |
| ISUZU NKR | 4HK1 (air brake option) | 2005-present | Light cab-over, air brake variants |
The compressor is also used in off-road equipment powered by the 4HK1 engine, including Hitachi excavators (ZX200-3, ZX240-3) and Case CX210B/C excavators.
- Engine-Gear-Driven Reliability: Direct gear drive from engine timing gear train ensures consistent compressor speed with no belt maintenance required
- Single-Cylinder Reciprocating Design: Simple, robust design with replaceable wear components including piston rings, valves, and cylinder head gasket
- Cast Iron Crankcase and Cylinder: High-strength iron construction provides rigidity, vibration damping, and extended service life
- Engine Oil Lubricated: Uses pressurized engine oil from the 4HK1's lubrication system, eliminating separate oil supply requirements
- Integrated Unloader Valve: Manages compressor load/unload cycle to reduce engine load and improve fuel economy
- Air-Cooled Cylinder Head: Integrated cooling fins optimized for 4HK1 under-hood airflow pattern
- IATF 16949 Certified Manufacturing: Automotive industry quality management standard with full component traceability
Each batch undergoes comprehensive verification testing:
| QC Item | Verification Method |
|---|---|
| Cylinder bore diameter | Air gauge measurement - tolerance ±0.025 mm |
| Piston-cylinder clearance | Measured at assembly - within factory specification |
| Crankshaft journal finish | Profilometer - Ra ≤0.4 µm |
| Valve seat seal | Vacuum decay test on inlet and discharge valves |
| Unloader valve function | Bench test with simulated governor signals |
| Air delivery rate | Flow bench measurement at simulated engine speed |
| Oil leakage | 100% pressurized oil feed test |
A certificate of conformance with air delivery test data is available for wholesale orders.
Common Failure Indicators:
| Symptom | Diagnosis |
|---|---|
| Air pressure builds slowly after engine start | Worn piston rings or leaking valves |
| Excessive oil in air dryer | Piston ring wear or scored cylinder wall |
| Compressor knocks or chirps continuously | Worn connecting rod bearing or crankshaft |
| Compressor runs continuously without unloading | Stuck unloader valve |
| Air pressure drops excessively | Leaking discharge valve or blown cylinder head gasket |
Critical Installation Notes:
- Compressor drive gear engagement is critical - refer to workshop manual for gear alignment procedures
- Use new O-rings and sealing washers on all air and oil connections
- After installation, drain air reservoirs completely and monitor buildup time
Maintenance Schedule:
- Drain air reservoirs daily to remove accumulated moisture
- Inspect air dryer and replace desiccant cartridge every 12 months or 100,000 km
- Change engine oil and filter at specified intervals
- Consider preventive compressor replacement at 500,000-700,000 km for high-duty applications
- Individual packaging: Sealed in anti-rust VCI bag, foam-lined carton
- Carton dimensions: 35 × 25 × 20 cm (approximate)
- Net weight: 9-11 kg; Gross weight: 11-13 kg
- Master carton: 4-6 units per export carton
- Lead time: 5-10 working days for stock orders
- Minimum order quantity: 1 piece (sample order available)
- Shipping methods: FedEx, UPS, DHL for samples; sea freight for pallet quantities
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