Exhaust Manifold 8-94451990-2 for Isuzu 4JG1, 4JG1T, 4JG2 – Hitachi EX40, EX45, EX60UR, EX75UR-5, Excavator

Enhance engine exhaust efficiency with this exhaust manifold (8-94451990-2) for Isuzu 4JG1, 4JG1T, and 4JG2 engines, designed specifically for Hitachi EX40, EX45, EX60UR, and EX75UR-5 excavators. This high-performance Isuzu exhaust manifold ensures smooth exhaust gas flow from the cylinder head to the turbocharger or exhaust system, improving overall engine performance and reliability.

Manufactured from high-strength cast iron, this Isuzu 4JG1 exhaust manifold 8-94451990-2 is engineered to withstand extreme heat, pressure fluctuations, and heavy-duty working environments. It helps prevent exhaust leaks, restore lost power, reduce excessive noise, and maintain correct backpressure for turbocharged engine variants.

This exhaust manifold for the Isuzu 4JG1, 4JG1T, and 4JG2 engines is ideal for replacing cracked or damaged manifolds during engine repair or overhaul. Precision machining ensures accurate alignment, secure mounting, and long service life in demanding construction applications.

Designed to OEM specifications, this exhaust manifold guarantees durability, perfect fitment, and reliable performance for diesel excavator engines.

Key Features & Benefits

• Part Number: 8-94451990-2

• Compatible with Isuzu 4JG1, 4JG1T, and 4JG2 engines

• Suitable for Hitachi EX40, EX45, EX60UR, EX75UR-5 excavators

• High-strength cast construction for extreme heat resistance

• Prevents exhaust leaks and power loss

• Supports proper turbocharger performance

• OEM-standard fitment for easy installation

• Long service life in heavy-duty applications

Engine Compatibility

• Isuzu 4JG1 Engine

• Isuzu 4JG1T Engine

• Isuzu 4JG2 Engine

Vehicle / Equipment Applications

• Hitachi EX40 Excavator

• Hitachi EX45 Excavator

• Hitachi EX60UR Excavator

• Hitachi EX75UR-5 Excavator

• Equipment powered by Isuzu 4JG1 / 4JG1T / 4JG2 diesel engines

Frequently Asked Questions

Q1: Which engines are compatible with this exhaust manifold?

This exhaust manifold fits Isuzu 4JG1, 4JG1T, and 4JG2 diesel engines.

Q2: What excavator models are supported?

It is compatible with Hitachi EX40, EX45, EX60UR, and EX75UR-5 excavators equipped with Isuzu engines.

Q3: What are the symptoms of a cracked exhaust manifold?

Common signs include loud exhaust noise, visible cracks, exhaust leaks, reduced engine power, and increased fuel consumption.

Q4: Is this manifold resistant to high temperatures?

Yes, it is made from high-strength cast material designed to handle extreme exhaust temperatures and pressure.

Q5: Does replacing the exhaust manifold improve engine performance?

Yes, replacing a damaged manifold restores proper exhaust flow, reduces leaks, and maintains engine and turbo efficiency.