Buying '94 75 series troopie. What to look out for

Thanks for your advice re the turbo conversion.

The car has neither the pyrometer or boost gauge. He has been running a turbo timer though to allow the turbo to call down after long trips. The owner has also opted for a 3" exhaust rather than the recommended 3.5" to help the impeller dissipate more heat. Since the mods were performed I think he has done at least 100 000km so I'd assume its all been running pretty reliably. Although according to his history he changed the radiator to an upgraded alloy unit a couple of years ago. So maybe there were some issues with temp climbing in certain situations.

I did a big rev and there was no smoke what so ever, even when on the road and under full load no smoke. Leaves me wondering maybe its running on the leaner side. After the Turbo kit is fitted is anything done to the injector pump to compensate for extra fuel?

Also I just looked at it more closely yesterday and noticed oil beginning to weep from the back of the cylinder head, just bellow the exhaust manifold. It looks as if it has been doing this for some time and has trickled down slowly around the bellhousing etc.

I made an offer considering that the head gasket may need replacing, because everything else fits the criteria. Especially because its auto, I'm paraplegic so unfortunately manual is not an option making this rig one of a kind for me.

You're lucky to find a Troopy of any vintage that has been fitted with an auto. Certainly a rare beast.
Not sure about the thinking behind the exhaust sizes, generally a larger diameter exhaust is to allow the turbo to ''spin up" and develop boost pressure sooner which diminishes the lag you can get between putting your foot down and the engine developing extra grunt. I can't see how the 3" or 3.5" exhaust would make much difference to the impeller dissipating heat. Having said that I would think the 3" will be fine.
I know there is a mod that can be done to the fuel pump whereby an aneroid is fitted to prevent that big cloud of smoke (unburnt fuel) coming out the tail pipe when you stick your foot into it. Usually the maximum fuel adjustment is re-set to allow more fuel to be injected so that the extra air volume generated by the turbo can be used to advantage. This is where a lot of people get into trouble by just increasing the fuel and not monitoring the exhaust temperature with the result being engine damage.
If you go ahead and buy this unit I would get that oil leak fixed and while the head is off, it, and the piston crowns can be inspected for cracks or over heating. Yeah, I know a bit late then but unless you know a good mechanic or have x ray vision there is no other way.
After that I would recommend taking it to a fuel injection shop with a dyno that knows a bit about tuning diesels and have them set the fuel pump up for you correctly. I would still fit an exhaust temp gauge and keep an eye on it.

Good luck with whatever you decide
Pop

Are you talking about the manual gearbox?

This is fitted with an 80 series GXL auto.