OK now I am getting to know her a bit better...
I took her to a Diesel Fitter for a run around the block and a chat about the condition of the motor etc.
The finding were somewhat concerning:
1) Very underpowered, no poke at all according to him, no pulling through in 3rd and 4th when it should have.
2) Looking at the fuel pump he couldn't see how it had been replaced - it is the original Toyota one (badges and all) so he suggested it may have been taken off and serviced.
3) The thinks the timing has been advanced which he says can be a good thing.
4) The clutch is at the very end of its travel
5) The injectors don't look like they are new or been recently cleaned either.
So it seems that I have been told some porkies. (I guess I am not surprised)
The upshot of it was this....
Maybe the most expensive repair I will have to do sooner or later is clutch - 4-500$ + 3-400$ labour!
Then he said he could service the injectors (if they needed it) and replace the diaphragm in the fuel system (can be done on the truck), do a compression test and set the fuel on the rack for about $400 in a single day next week. If it turns out that it doesn't need the injectors done - ie they actually have been done or look ok he will call me.
He doubts I would need a new pump.
He quoted injectors at $55 each.
Then I started chatting to him about a diagnostic approach to see what could be done in the mean time. This is the outcome of that discussion.
1) I did an oil change. She bled 6.7l of very black oil and I replaced it with Fuchs Titan ultralube 15W40 diesel oil - she tool 6.5 and then another 2 or 3 hundred ml after the motor was turned over.
2) Replaced the oil filter : Z9
3) Replaced the air filter
4) Replaced the fuel filter z169a
Took her for a burl, immediately running a bit free'r - breating better and needed the oil change I reckon.
Once up the road I cracked the rack lock nut and opened her out just under 1/4 turn (counter Clockwise) and reseated the nut.
No black smoke and the power had definitely improved
Around the block and again another full 1/4 turn out - still no smoke and appreciable better depth in 1st and second.
I have eventually left it advanced 3/4 of a turn from where I started today and she is completely different to drive - still no smoke - idles well and does not need to be revved out to get some momentum going...
Questions:
1) How much should I go when gently making this adjustment - I know that I can damage the engine if I push it too far..
2) Will the injector, diaphragm, compression day of work be worth while or should I save my $$s for the clutch
3) Can I get confirmation that the oil I selected is good - I am going to do a second change in 3000km and then only do it every 5-7k but that will give me a starting point.
4) What tyre pressure do people recommend - the handbook seems to suggest 24psi front and 28psi rear - I used to run 15 off road and 30 onroad allround for the Jeep... Any thoughts>
5) I filled her up with 50 L of diesel - are there any additives I should consider at this time to help clean the engine out or anything? It has an 85L tank - is there any point in completely draining it (carrying some fuel and doing a roadside prime/bleed) to ensure that it is all fresh or will that mean crap and gunk get into the motor?? I would like to confirm how much the tank capacity is and what sort of economy I am getting.
That should be about my quota of help credits I have at the moment

I still need to give her a real clean tomorrow.
BTW what is the meaning/origin of this symbol - on the rig everywhere and on my keyring - clearly a Toyota logo...
Will