I own a 93 rodeo ute with a 2.8 turbo diesel.

From the time of purchase (bout 1 month ago) my ute has perfomed lower then whats expected. It seemed to originally be lacking in power until about 2300. at this rpm you can start to hear the turbo whistling. An older model (97) seemed to have power right threw the rev range, with the same motor.

But the real problems started after I adjusted the tappets and checked a few things.

I pulled the ducting off and found oil on the turbo impella and in the ducting. I then saw a boost line that went from the inlet manifold between the turbo and motor to a diaphram at the top injecter pump. I think its some way of regulating fuel according to the turbo. I removed the top of the diaphram to inspect it, it was full of oil which has had of come from the turbo, threw the manifolds. I cleaned out the diaphram and refitted it back togeter.

I then wanted to test for a sticky waiste gate. So I used an air compresser with airblower to open and close the waiste gate from the diaphram. It seemed to work ok.

After the tappets, injector pump diaphram and the waiste gate Ive now got no power above 1500 revs. It revs to 1500, then blows a lotta smoke, sits at 1500 (on full throttle) for about 10secs then slowely increases to max rpm blowing a heck load of smoke..

any ideas?

Is your exhaust system plugged?
If it is then the turbine won't be able to spin up.
Recent oil change, any gummed up oil on the turbien bearings.
AS a note please idel the engine a bit before shutting it off to allow the tunbine to stop rotating.
Rotating turbines with no oil don't last too long...
Good luck.
Eric

The pipe from the turbo over the rocker cover and into the inlet is part of the EGR system. Exhaust gas recirculation system. some of the exhaust gauses are recirculated back into the inlet to be burn in the engine again to meet various emission standards. If you have no emission requirements you can remove this pipe and blacnk off both ends in the turbo and inlet manifold. There are vacume controlled valves on the inlet manifold that control this operation, if they are faulty it may account for some loss in performance.
It's a 2.8L rodeo, I'm guessing it's a 4JB1-T and you are in Australia?

But it sounds like you have incorectly set the tappets, what did you set them to, and engine hot or cold? I don't have my book handy right now so can't help with that for now.

Other things to check are fuel filter and air filter, both can effect power if not maintained. I suggest and replace them if you don't know there condition.

Let us know how you get on, this is fixable.

Note; The time to alow for turbo wind down is mainly to let it cool down rather than spin down. Parts of the turbo are at exhaust temperatures so can burn up the bearings without oil and water flowing to cool down.

The exhaust did have a small leak, but I fixed it to have a similar result.

oil changes have been every 5000, as said my service records by the earlier owner. although I dont know about the filters at this stage, might do as you say and replace em.

------------------------

the line I was talking about went from the inlet manifold, after the turbo, to a diaphram the injecter pump... after I removed the top 4 bolts on the diaphram oil gushed out. I clened it out and rebolted it back together. I think this may be the cause of the power drop, I just dont know enough about it.

Ill look into the EGR... could be the problem...

yeah im in australia..

Tappets 0.40mm cold. Says it on a sticker under my bonnet, so they are correct, without a doubt.

about the turbo, I usually let her warm up, and I got a turbo timer.

Sounds like you largely have it under control. Let us know if we can help some more.

Gday Dougie, That diagphram that you mentioned is called the Anaroid governor, this senses any change in boost pressure and alters the fuel delivery to compensate. Its very important that the tube is not restricted in any way because the fuel-air mixture will become lean of fuel and you will have a drop in power. When you feel the surge in power as the turbo spins up, thats that governor doing its thing but it must get a clear signal from the boost side of the turbo (Engine side). If in doubt, replace the hose and It dousnt sound right that there is oil getting into the diagphram, check with your local diesel injection specialist on that one. It sounds like you have found your power problem though.

Good luck

Ive just read the previos posts in this thread which I should have done to start with. Diesels need two things to run, Fuel and air. Black smoke means too much fuel for the amount of air its getting. Remove the air cleaner element and run the engine again, (I dont care how new the element is) check all the air passages for obstructions. ( You woudnt believe what I have dug out of air intakes over the years)

You said that you have adjusted the tappets, make sure you got this right mate. Its easy to stuff it up, (been there, done that). make sure the timing marks on the injector pump flange are aligned. (Injector pump timing is normally set for life)

See how you get on.

Cheers

Strange coincidence.

I also became too curious over the weekend and took the cap off the fuel aneroid (aka boost device) on my engine and had some oil spill out. It felt a little slower (nothing major) at the start but 200km later it's back to feeling normal. I imagine the oil that spilled from mine was blowby from the bottom of the inlet manifold as the pickup line used to run from the lowest point.

The local diesel injector service guys said the screw in the middle of the back of the aneroid is the lower limit. Screwing it in (or replacing it with a longer one) will give you more fuel off boost without affecting the maximum fuel delivery. This makes sense from what I saw inside.

Just an update, I checked the "EGR", seems mine lacks an EGR system all together, I can see a crank case vent system, could a pcv valve cause a similar problem to the egr?

Im gonna get the turbo rebuilt to repair the turbo bearing leak (and thus the oil build up in the anaroid governer diaphram)