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Jackaroo 4JX1

A great machine, but needs careful care. There have been some horror stories out in Jackaroo land, with people left stranded with large bills, which trace back to poor understanding of what is, a complex machine.

The engine, which is a common rail with a HUEI system [see below]

HUEI System


Suggested Actions for Owners [Injector Article written by Red-one]

Ensure the correct type and grade of oil is being used in the engine. Correct operation of every part of the injector oil circuit is critical to the successful operation of this engine. The piston within the injector has to move exactly the correct distance to deliver the correct quantity of fuel, and operate at exactly the right moment in the engine cycle, for the engine to run correctly. Selection of a good quality oil, of suitable viscosity, clearly plays a vital part in this.

Check sump oil level regularly (at least once per week), and be aware that a rising oil level could be the start of other problems.

Keep a wary eye open for fluid loss or leaks such as oil leaks from engine seals, or the smell of diesel in the coolant.

Holden Jackaroo owners – contact Holden and enquire whether the Campaign 03-H-03 has been done on your vehicle. Note this Campaign relates to the injector sleeve sealing O-rings, which according Holden : “can deteriorate and cause fuel to leak into the crankcase”. If not, book it in – Holden should do this free of charge.

At each 80 k kms service interval, replace the O-rings between injectors and sleeves, and between sleeves and cylinder head, as a precaution. This will add little to the overall cost of the service, as the mechanic will already be working in this part of the engine, checking and adjusting the valve clearances.

If the oil level in the sump rises to the point that it enters the crankcase breather pipe, the engine may start to run on it’s own oil. In this situation, in Holdens words : “ this may result in an unintentional increase in engine speed, and possibly vehicle speed”.
If this happened, it would cause most people to get very alarmed, especially if it happened in heavy traffic, driving at high speed, etc.. The engine will no longer respond to normal throttle operation, and will continue to run even with the ignition switched off.

In extreme cases, engines have been known to red-line and self destruct. In the UK, there have been cases of engines being replaced free of charge by Isuzu.

If a motorist is unfortunate enough to experience a run away engine, the best advice is to immediately steer in a safe direction, engage the highest possible gear and jump on the footbrake and hand brake together to stall the engine. Only depress the clutch or engage neutral as a last resort as this will allow the engine to spin freely out of control.

This will be alien to most normal driving, and against normal instincts. Failure to stop the engine at this point may lead to a very expensive engine rebuild. Staying on a high traction surface eg bitumen would be better than driving onto loose sand – spinning wheels would have little braking effect on the engine. Do not turn off the ignition before the vehicle comes to rest, to avoid locking the steering wheel








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