Nissan Patrol 4x4 (Africa)

petrol wrote:

biggles wrote:Ran car with no filter and even took the defunct airflow sensor housing off. No difference.

Checked everything. All that is left is the intercooler.

OR and this is a growing suspicion. The guy who had the troll between me and Pieter duToit pulled the turbo and put in a smaller unit... I will check model numbers when I am home next week-end.

It sound like the turbo was replaced with a too small unit.
But to make sure Measure the boost just after the turbo, before the IC, I have seen IC parcially blocked and easily rob 0.5 bar boost.

I am starting to think that aswell. On Saturday I am home and I will check the turbo model and compare to the OEM spec. Frans has seen that turbo and he should have noticed if it was smaller than what he put on it!!

The turbo specialist put on a boost guage after turbo and told me it is not even making half the boost it should. So going back to the reconditioner... would love to just forget dealing with them but when you drop the cash to recondition a turbo and get told its not making half what it should!!

I was with micheal the other day ....we looked at a landy that didn't want to go .....there is a vacuum line that makes the pump open to give more feul as the boost increase just check that before you start stripping things

4.2's don't work on vacuum, only pressure from the turbo to the "anoid" ( or what ever the thing is called ) that sits on top of the diesel pump to increase fueling under boost

Ok man ....that pipe that makes it feul up ....if it leaks nothing happens when you put your foot down ....

Tinus lotz wrote:I was with micheal the other day ....we looked at a landy that didn't want to go .....there is a vacuum line that makes the pump open to give more feul as the boost increase just check that before you start stripping things

Maybe but look at first post, egt is running at 700 so I think the fuel part is working fine, I really think this car is suffocating with a to small turbo.

Air filter blocked??..... inlet pipe from turbo to inlet manifold ( including intercooler ) cut or small tear maybe. Check the clamps, on mine the cheap clamps cut into the silicone hose and after time it cut into the hose quite badly. A small hole on the silicone hose can be quite a big hole when under boost.

Check the hose from the turbo that runs to the diesel pump, there ( on mine there is ) a "T" piece where one line goes to the diesel pump and the other runs to the wastegate diaphragm. There may be a small leak there that isn't telling the wastegate to close. Check if the hose isn't blocked with oil residue built up over time.

Nothing new to report but on the comments made since: as mentioned fueling is not an issue as the EGTs are very high.
I have ran with the whole induction piping disconnected and a little different but not more than you expect with no restrictions.
The waste gate was checked to be OK. The whole turbo reconditioned. The pre-load on the waste gate is good. And I am running it with the waste gate actuator disconnected.

Next jobs are: Check turbo model
Check intercooler
Somehow check exhaust.

Then I am going to play with the timing.

If none of that works I am going to drive it to cape town and leave it with frans

biggles wrote:
Then I am going to play with the timing.

So I got around to playing with the timing.

I have been putting it off for a while as the pump is quite an intimidating piece of kit and the place I dropped it off at refused to look at the timing pointing at the turbo. Them "It is not making boost it must be the turbo" Me" the turbo has been reconditioned" Them "Ja well..."

So with great trepidation I made sure I could pull it out of the garage if it never started again, I located all the bolts. Adjusting the timing is the easiest thing I had ever done. I did not have the gauge so did it "redneck style" by free hand rotating the pump and taking it for a drive. My first observation was all the bolts were quite loose. My second observation was the pump was at the fully retarded position... I was starting to get very hopeful I had finally found the problem. So I rotated it as far as I could freehand against all the fuel lines and attachments. Tightened it up and went for a spin.



Immediately I felt the lowdown power was MUCH better. (I could back up the driveway without reving the crap out of it). Immediately boost was much lower down and up to 0.4 where the waste gate opens. So I made two more advancements on the timing and it got better and better. And almost no smoke now (it is still over fueling but I will get the timing right and then play with the fuel). The last adjustment was with an old hockey stick and ratchet strap to get the pump to rotate further against the fuel lines. The last adjustment left a slightly ruff run in a portion of the rev range. So I think I am on the limit. To go further I will need to loosen the fuel line brackets. And I ran out of time.

So anyway looking much better and hope restored.

So someone had adjusted the timing previously and not tightened the bolts properly. So I think the timing had slowly been retarding itself. Then When I did some work looking for a clogged mesh on the inlet to the pump, the action of pinching up the inlet banjo bolt I probably inadvertently rotated the pump to fully retarded position. It seems like a bolt on the bottom bracket that holds the pump is missing. I am guessing because the Ausssie forums mention a 4th bolt that is difficult to get to. I found the bracket and what looks like a nut welded to teh bracket, not being a gynecologist means I couldn't get to it but as teh pump rotates with just the 3 nuts loosed the 4th must be missing.

Awesome news !!!!.... sad that there are chops that have no clue that its sometimes good to have tight nuts...... .... .......

If you do get to drive the Patrol to the Cape..... I'd still drop it off at Frans for a day or 2, just to get that sweet spot. He did some magic on mine and holy crap it goes like the clappers now !!!

Ja, the Patrol is going home in a month or so (home is Cape Town) I am not fine tuning... I am getting the thing capable of getting to Cape Town.