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Discussion Starter #1
Good day, Gents.

I'm hoping someone has intricate knowledge of the V6 diesel's turbo setup, or can help get me in touch with a dealer, V9X engine or turbo specialist that has the knowledge and resources to confirm or refute whether a certain replacement turbo will fit my vehicle. Any and all help will be appreciated.

OK, my understanding is that the V6 3.0dCi engine is called the V9X and, was jointly developed by Nissan and Renault and is used in the Navara, Laguna and Infinity Qx70. (I've seen Laguna/Qx70 specs with a slightly higher power rating, 175 vs 170kW, but assuming that's just accomplished by software tweaking.) By that logic then, a replacement turbo for the Laguna/Infinity should fit my Navara's engine? More specifically, I found a TD04HL-20TK32S-VG turbo online but supposedly it only fits the Laguna and Infinity. Local Nissan quoted me £3203/US $4500 - not even touching that with a stick! - and turbo dealers locally and South Africa have no stock. It seems this turbo is very rare. After some digging, I've come across two part numbers for the turbo I need: 1441100Q1K (Nissan dealer) and 49189-07803 (3rd party turbo supplier), which both point to a Mitsubishi TD04HL-20TK32S-VG turbo. Also came across more part numbers for the Mitsubishi TD04HL-20TK32S-VG turbo, and not sure what the difference (if any) between them all are.

I asked the online seller if he knows whether his will fit my Navara, but he's not aware that it's compatible and hesitant to just say yes. (Which I actually appreciate, easy to be a crook, especially online!) I can't take my Navara apart to take pictures of the turbo and part numbers, I use it daily and don't own a 2nd vehicle, and apparently the best way to get to the turbo is removing everything in order to pull out the engine as the turbo is situated in the V right at the back of the engine.

The reason I'm looking to replace my turbo is because of the following 3 symptoms: bad fuel economy (esp. city driving), black smoke when accelerating and an oil leak on what looks like the intercooler. It does not ilde unevenly nor does it have difficulty starting, black smoke can possibly be partly attributed to the chip which I assume sends more diesel through to injectors. Oil leak is more significant than just sweating or just a few drops, but not that I need to add a pint of oil every week. Vehicle has 206000km/128000mi on the clock and our diesel is very 'dirty', 50ppm is the 'cleanest' we can get. Probably about time to check the injectors and I am strongly considering getting rid of the chip.
A local mechanic (non-Nissan) took a look and showed me the amount of oil in the pipe connecting the turbo & intercooler, he is of the opinion that the turbo's seals are shot and hence it needs to be replaced, as well as getting the intercooled flushed. He had a 3.0dCi of his own and wouldn't recommend local overhauling of the turbo, he had it done and got bad results. I'm not convinced about the turbo, but I'm not an expert either. I believe flushing of the intercooler is a good idea and it shouldn't break the bank.

I've seen mention of an oil trap that goes somewhere in the air intake and might solve my oil leak issue....
Removing the chip and checking/overhauling injectors might tend to fuel economy and smoke issues....
So now I'm quite uncertain how to proceed - thoughts, suggestions anyone??

Thanks!
 

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Discussion Starter #2
Realising how long the post is now.......my apologies, hope a few folks have the guts to suffer all the way through! :colours:
 

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Turbos worry a lot of people, for the inexperienced owners and mechanics they regard turbos as the devil's work which must be replaced at the slightest sign of smoke, oil etc.

Most engines nowadays vent the crankcase into the inlet. This means there is always going to be some oil around. If your turbo seal went, like a 90s defender, the engine would run on its own oil and go bang.

So oil in the intake and intercooler is not your problem.

First job is (as per your other post) to replace the fuel filters. Cleaning the MAF and replacing the air filter too.

If the problem persists, run some very strong injector cleaner through the tank.

If that makes no difference, there are two regular issues with the V9x. The intercooler leaking and the EGR blocking up. Either of these could show your symptoms.

Go step by step and don't panic!
 

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Turbos worry a lot of people, for the inexperienced owners and mechanics they regard turbos as the devil's work which must be replaced at the slightest sign of smoke, oil etc.

Most engines nowadays vent the crankcase into the inlet. This means there is always going to be some oil around. If your turbo seal went, like a 90s defender, the engine would run on its own oil and go bang.

So oil in the intake and intercooler is not your problem.

First job is (as per your other post) to replace the fuel filters. Cleaning the MAF and replacing the air filter too.

If the problem persists, run some very strong injector cleaner through the tank.

If that makes no difference, there are two regular issues with the V9x. The intercooler leaking and the EGR blocking up. Either of these could show your symptoms.

Go step by step and don't panic!
Thank you landmannnn, that makes a lot of sense indeed and it doesn't sound all that daunting.
Main fuel filter and air filter replaced during service - good there.
EGR and EGR cooling valve replaced by previous owner at 165000km - should be good there too.
I don't see an inline fuel filter in the engine compartment, is it under the chassis somewhere?....can't crawl under the car in my work duds, ha ha!
Doubt the MAF was cleaned. Anyone know off the top of their head where the MAF is to be found in the V6 3.0dCi? There's a Continetal-branded sensor on the outlet side of the air filter housing, is that it?
And you say to remove the smoke generator - euphemism for the chip or what are we talking about here?

Fitting an oil catch can sounds like a good idea, I think I'll possibly try and get a hold of one of those ProVent units.
Thanks for the heads-up about the intercooler issue, pretty sure now it is indeed the source of my leak. Can't see properly in that specific area because of the density of components, but there isn't much else that can spill oil apart from the intercooler.
 

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Turbos worry a lot of people, for the inexperienced owners and mechanics they regard turbos as the devil's work which must be replaced at the slightest sign of smoke, oil etc.

Most engines nowadays vent the crankcase into the inlet. This means there is always going to be some oil around. If your turbo seal went, like a 90s defender, the engine would run on its own oil and go bang.

So oil in the intake and intercooler is not your problem.

First job is (as per your other post) to replace the fuel filters. Cleaning the MAF and replacing the air filter too.

If the problem persists, run some very strong injector cleaner through the tank.

If that makes no difference, there are two regular issues with the V9x. The intercooler leaking and the EGR blocking up. Either of these could show your symptoms.

Go step by step and don't panic!
Thank you landmannnn, that makes a lot of sense indeed and it doesn't sound all that daunting.
Main fuel filter and air filter replaced during service - good there.
EGR and EGR cooling valve replaced by previous owner at 165000km - should be good there too.
I don't see an inline fuel filter in the engine compartment, is it under the chassis somewhere?....can't crawl under the car in my work duds, ha ha!
Doubt the MAF was cleaned. Anyone know off the top of their head where the MAF is to be found in the V6 3.0dCi? There's a Continetal-branded sensor on the outlet side of the air filter housing, is that it?
And you say to remove the smoke generator - euphemism for the chip or what are we talking about here?

Fitting an oil catch can sounds like a good idea, I think I'll possibly try and get a hold of one of those ProVent units.
Thanks for the heads-up about the intercooler issue, pretty sure now it is indeed the source of my leak. Can't see properly in that specific area because of the density of components, but there isn't much else that can spill oil apart from the intercooler.
Yes, some people do call smoke generators by the name tuning chip. Not sure why.

The inline fuel filter is near the fuel tank, they are pretty cheap too.

Yes the MAF is next to the air filter, it is all one unit including the tube and less exposed than the 2.5, but worth giving it a spray with MAF or electrical contact cleaner.

Indeed the intercooler is well hidden, of you take off the panel under the radiator (about 8 bolts) it then becomes visible.

By the way, I was looking at my wife's Infiniti with the same engine and the turbo looks different.
 

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Yes, some people do call smoke generators by the name tuning chip. Not sure why.
As I am sure you know, a diesel engine is controlled by the quantity of fuel pumped into it, these cheaper, so called 'tuning chips' generally attempt to overcome the standard OE ECU programming by tricking the engine into thinking it is still cold, so it injects more fuel, in the misguided theory that more fuel=more power.
The engine cannot effectively burn and use all this extra fuel, so passes it through the exhaust emitting it as smoke, hence the nick name.
They can work if the engine is used hard all the time, but I said misguided as some of the unburnt extra fuel can bypass the piston rings, end up diluting and overfilling the sump oil, with disastrous results.
Personally, I would avoid them like the plague.
 

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Discussion Starter #10
That is the exact one I was looking at, but not sure if it will fit. Listed as compatible with Laguna and Qx70, seller can't confirm if it will fit the Navara. Landmannnn said earlier he had a look at his wife's Infinity and the turbo differs from his. And with all the info it seems a replacing the turbo might not be the smartest thing to do.

But thanks for the heads-up.
 

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As I am sure you know, a diesel engine is controlled by the quantity of fuel pumped into it, these cheaper, so called 'tuning chips' generally attempt to overcome the standard OE ECU programming by tricking the engine into thinking it is still cold, so it injects more fuel, in the misguided theory that more fuel=more power.
The engine cannot effectively burn and use all this extra fuel, so passes it through the exhaust emitting it as smoke, hence the nick name.
They can work if the engine is used hard all the time, but I said misguided as some of the unburnt extra fuel can bypass the piston rings, end up diluting and overfilling the sump oil, with disastrous results.
Personally, I would avoid them like the plague.
I bought the vehicle with the smoke generator :)lol:) already installed. Took it to a local diesel centre (so-called fuel pump & injector specialists) and told them to see if they could find it and remove it. They could unfortunately not figure out where/how the chip was installed. Then got hold of the place that installed the chip, in a town 200mi from where I live, but the owner as was less then helpful. He thinks him and his chips & tuning are God's gift to motoring.
Have to find someone with the proper knowledge & expertise to remove it, there's bound to be someone that's not 200mi away.
 

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I bought the vehicle with the smoke generator :)lol:) already installed. Took it to a local diesel centre (so-called fuel pump & injector specialists) and told them to see if they could find it and remove it. They could unfortunately not figure out where/how the chip was installed. Then got hold of the place that installed the chip, in a town 200mi from where I live, but the owner as was less then helpful. He thinks him and his chips & tuning are God's gift to motoring.
Have to find someone with the proper knowledge & expertise to remove it, there's bound to be someone that's not 200mi away.
It is probably somethinglike this https://exedigitaltuning.co.uk/chip...zqLtTS-jwp0uBsCosgrDWcEjZGqy_PnMaAjK0EALw_wcB

If you take the plastic cover off the engine it will probably be visible and you can follow the video on that site in reverse.
 

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If I read your thread right, your mechanic hasn't inspected the turbo as such, just gone by the oil in the pipes?
This is not a good way to start repairs.
The turbo needs a proper inspection, look for excess axial and radial play on the shaft, look for carbon deposits on the vanes.
I do not own a V6 but my understanding is that some oil in the pipes is quite normal, how much is up to the person looking, your mechanic says too much, but then that is only HIS opinion, and the quantity is not cast in stone, never expect them to be bone dry.
If there is indeed excess play in the shaft then chances are the seals are also worn out and replacement is necessary.
If there is no play there is no reason why the seals alone have worn out.
Again I do NOT definitively know whether the V6 has variable vane turbos, but if there is excess carbon build up on the vanes this would stop them giving the correct boost pressures, causing the symptoms you describe.
If the vanes are stuck due to carbon they can be cleaned, get the most powerful OVEN cleaner you can get (in the UK Mr Muscle is widely used in the trade), give the insides a few doses (and rinses) of the cleaner rubbing with an old toothbrush (or the mother in law's if you don't like her?), it will come up like new.
Unit replacement on a hunch is never a good practice.
 

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Am I the only one thinking we are looking waaaay too deep into this. There is an oil leak coming from intercooler, in other words the intercooler has a leak somewhere, in other words he has a boost leak which would give him all the symptoms that he's experiencing. Seems like the smoking gun to me.

I wouldn't do anything else until you've had that intercooler tested. Will most probably find it needs to be repaired or replaced and then everything will be back to normal. Common issue on these engines. Boost pipe likes to leak as well might be worth inspecting the pipes at the same time.
 
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It does have a variable vane turbo.

I would still recommend getting the smoke chip off first to see if that is the cause of the smoke and poor fuel consumption.
 

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Am I the only one thinking we are looking waaaay too deep into this.....
.....I would still recommend getting the smoke chip off first to see if that is the cause of the smoke and poor fuel consumption.
Gentlemen, I do believe the best strategy is a two-pronged approach involving the intercooler and smoke chip. Take off the IC and have it tested & fixed, that should take care of the oil leak. Also check that all joints are properly sealed to ensure there is no boost leak. Like mentioned before, I have wanted to take the chip out from the get-go and that should make a difference to the smoke & fuel consumption.
Still finding the right mechanic to do this, I don't want just anyone fiddling with it considering the complexity of the V9X. Just getting the IC out among the 6 other coolers probably a tough job!

If I read your thread right, your mechanic hasn't inspected the turbo as such, just gone by the oil in the pipes?......
good luck with inspecting the turbo engine out job or body off to change the turbo on the V6 :frown2:
Only test the mechanic mentioned was that he measured boost pressure which is still OK. Then pointed out the oil and hence turbo diagnosis, that's why I'm not so sure. For now I'm hoping to avoid getting to the turbo, will try the above first, see how that goes and report results.

Thank you all for the advice and guidance - much appreciated. :awesomework
 

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Gentlemen, I do believe the best strategy is a two-pronged approach involving the intercooler and smoke chip. Take off the IC and have it tested & fixed, that should take care of the oil leak. Also check that all joints are properly sealed to ensure there is no boost leak. Like mentioned before, I have wanted to take the chip out from the get-go and that should make a difference to the smoke & fuel consumption.
Still finding the right mechanic to do this, I don't want just anyone fiddling with it considering the complexity of the V9X. Just getting the IC out among the 6 other coolers probably a tough job!



Only test the mechanic mentioned was that he measured boost pressure which is still OK. Then pointed out the oil and hence turbo diagnosis, that's why I'm not so sure. For now I'm hoping to avoid getting to the turbo, will try the above first, see how that goes and report results.

Thank you all for the advice and guidance - much appreciated. :awesomework
Did you get a resolution?
 

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Afternoon, Gents.

Sorry for slow reply - busy @ work and not much time spent on here recently.

Quick update: dropped the truck off at mechanic's (not the one who made the turbo diagnosis); instructed them to 1) find & remove 'smoke generator' and 2) remove intercooler so I can get it flushed & fixed.
Got a call from the tech few hours ago - no sign of a chip ANYWHERE. Not even one that had been there and was removed. This despite having an invoice for installation of a chip & pedal accelerator from a previous owner....... Sounds fishy, but OK, now I needn't worry about the smoke generator any more. Tech says it does seem as if intercooler's tank is busted, sent it off to radiator repair place and should have it back Monday. Once it's back in, I might have them run diagnostics and update software, if available/possible. Will advise about results next week.

Wish everyone a good weekend, cheers for now!
 

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Sounds like the previous owner lied to you, I bet he took the chip off and sold it. You will probably find in on ebay under completed listings.

Useful to know if the intercooler can be repaired, a new one is £1,000 from Nissan or about £400 elsewhere. (multiply by 20 for NAD)
 
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