Thread: Black Diesel

Before the Defender I had a 2.8l GU Patrol. I was talking to the workshop manager at our local dealership and he said that the rule of thumb seemed to be that if the motor made 75,000 km then it was likely going to be a good one. He also mentioned that they had no idea why the Navara engines where ok as they could not definitively track the root course of the problem in the Patrol.
That was some years ago now though and it would be interesting to know why these motors went bang.
I always find it funny that Patrol owners call my Td5 unreliable. But karma's a bitch and I shouldn't get smug!
Cheers

Nino.

ZD30 I think go bang because of the boost and fuel control method. Owners revert to manual boost control to reduce the probability of the problem arising. Something about higher boost with more fuel increasing EGTs eventually resulting in the Big Bang sort of speak. A little googling should reveal the forums scuttlebutt.

OK a quick bit of googling reveals that NADS is the acronym for the Nissan Anti Detonation System the link will tell you all the patrol forum scuttlebutt on the hand granade work around, if you care (oops, want to know).

My fading memory tells me that The Solution was referred to on a post here on AULRO. - Several factors but the main ones were (correct me if I'm rrong...)

EGR valve, All the usual results, -nuff said. Fix is the same for tD5.

Insufficient oil... it really needs 30 to 40% more (Fix= shorter dipstick!)

Variable boost control... on the VNT turbo. The ECU did'nt get it right all the time...gunky EGR and downstream deposits did'nt help. Tended to overdo it.

High EGT. Getting the wrong balance of boost and fuelling is a major factor.. caused by the other problems.

MAF sensor is sensitive to oily contamination. Fix = effective PCV filtering like a PROVENT. Not cheap, but nor is a re-built engine.

- And 'Dressing' on the incorrect side would surely consign your engine into oblivion.....


None of the above affects tD5's, as we have a magic gauge that tells us all of these things...

- plus, our sartorial standards are higher than theirs...

Diesel hose black from

Used oil.co tamination.
Acid contamination (bad wvo blending)
Over heating in the Injectors or having a return line run too near an exhaust.

The last two I know about from first had experience when I was setting up fozzy for who and the first from when in was experimenting ting with using e gone oil as a fuel supplment.