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The issue has been fixed. This is after two local mechanics having NO idea how to fix the problem and charging me to do things with the actuator which in the end had nothing to do with the noise. In fact the first mechanic had me buy a new actuator then he simply screwed it on. This resulted in the vehicle losing all power and not accelerating above 40 km/h.
I had to have it towed to Bundaberg where Robbie from Diesel Injection Technology Pty Ltd found the issue within 10 minutes.
Turns out the 2 x studs for #1 exhaust port had snapped off. So the remaining bits of stud were drilled out and removed/replaced. They then skimmed the manifold and reassembled with the appropriate gaskets.
The Patrol now sounds like new and runs extremely well.
Lesson learned is to not go to general mechanics and take the vehicle to a diesel specialist.
Happy to be back on the road !
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