The TD42 is one of Australia's most respected diesel engines, and Zexel manufactured the original fuel injection components for this legendary powerplant. Proven reliability across hundreds of thousands of kilometres is what this genuine Zexel injector for Nissan Patrol TD42 engines delivers. Unlike modern common rail systems, the TD42 uses mechanical injection: simpler technology, but precision still matters. Each unit includes heat shield washer, nozzle washer, and leak-off washer for complete installation.
Vehicle Fitment
Suits Nissan Patrol fitted with TD42 4.2L diesel engines from 1989 through to 2002 models.
Why the TD42 Remains Legendary
Simplicity defines the TD42's appeal. No complex electronics, no delicate sensors, no fragile emissions equipment. It's a mechanically-injected inline six that responds to basic maintenance and keeps running. Mining companies, pastoral stations, and outback tourers have pushed these engines to extraordinary distances. The mechanical injection pump and injectors represent proven technology that survives neglect better than modern systems. That doesn't mean worn injectors don't cause problems. They absolutely do. Poor spray patterns lead to incomplete combustion, wasted fuel, excessive smoke, and carbon buildup throughout the intake system.
Recognising Worn Injectors
White or blue smoke at startup indicates injectors aren't sealing properly, allowing fuel to seep into cylinders overnight. Black smoke under load means poor atomisation. The fuel isn't burning completely. Hard starting, particularly when cold, suggests injectors have lost their precise opening characteristics. Rough idle that smooths as the engine warms points to inconsistent fuel delivery across cylinders. The 1660043g22 and 1661043g01 reference numbers both apply to this injector, giving you multiple cross-reference options when sourcing parts or verifying compatibility.
Mechanical vs Electronic Systems
The TD42's mechanical injection differs fundamentally from common rail diesels. Pressure comes directly from the injection pump rather than a pressurised rail. Timing is mechanical, controlled by pump position rather than electronic signals. This simplicity means fewer things can fail, but it also means worn components directly affect performance. A failing Zexel TD42 injector doesn't trigger warning lights or limp mode. It just makes the engine run poorly. Diagnosis relies on observation and experience rather than diagnostic scanners.
Installation for Mechanical Injectors
Clean the injector bore thoroughly before fitting the new unit. Carbon buildup around the seat prevents proper seating and causes combustion gas leaks. The heat shield washer goes on first, followed by the nozzle washer. Order matters for correct sealing. Don't overtighten the injector hold-down bolts. These thread into aluminium, and excessive torque strips threads or cracks the head. Reconnect the leak-off lines carefully. These low-pressure lines return excess fuel to the tank, and proper connection prevents air entering the system.
After installation, bleed air from the fuel system. Mechanical systems are less forgiving about trapped air than modern common rail setups. Crank the engine with the throttle closed until it fires smoothly. The first few minutes of running may be rough as remaining air purges from the system.
Warranty
This Zexel TD42 injector is a genuine Zexel product with full statutory warranty. Each injector includes heat shield washer, nozzle washer, and leak-off washer.
