3.0 DDTI injector service gotchas

[poddy]

It's a 2008 3.0 with CRD

Been thinking about taking out the fuel injectors and then having them taken to a shop to get them serviced.

I am allways on a budget.

I am searching on them internets on my own, but I thought I'd cast here too, there's allways some gems I pick up here along the way.

So the question is:

Can I replace the diesel injector nozzles on my own? Without any specialised tools?

And then, I gues this is related to the above paragraph, the manual says that whenever the high pressure fuel line gets undone from the top of the injector, it should be replaced with a new piece. But that kinda seems far fedged, no? I mean it's a steel fitting no? I am thinking there is likely just a little o-ring sitting inside that needs to be replaced, but surely not the whole pipe...?

[mudski]

You can't service the injectors, they are a sealed non servicable part. You can remove and refit by yourself. Replace the seals while your at it. You should replace the injector pipes as the manual says because you will have around 30,000psi of fuel pressure through them and if you could damage a pipe or connection without knowing. There's no oring in them too.

[growler2058]

It's a 2008 3.0 with CRD

Been thinking about taking out the fuel injectors and then having them taken to a shop to get them serviced.

I am allways on a budget.

I am searching on them internets on my own, but I thought I'd cast here too, there's allways some gems I pick up here along the way.

So the question is:

Can I replace the diesel injector nozzles on my own? Without any specialised tools?

And then, I gues this is related to the above paragraph, the manual says that whenever the high pressure fuel line gets undone from the top of the injector, it should be replaced with a new piece. But that kinda seems far fedged, no? I mean it's a steel fitting no? I am thinking there is likely just a little o-ring sitting inside that needs to be replaced, but surely not the whole pipe...?

Keen to learn more about this too. I heard its $4500-$5000 to get injectors replaced. Waaaaaay exxy!!!

[mudski]

Keen to learn more about this too. I heard its $4500-$5000 to get injectors replaced. Waaaaaay exxy!!!

if you can use a spanner, you can replace them. Not hard, just time consuming.

[growler2058]

if you can use a spanner, you can replace them. Not hard, just time consuming.

I was more worried about the 30,000 psi taking me out

[mudski]

I was more worried about the 30,000 psi taking me out

Pressure in those lines is gone soon after shut down.

[poddy]

You can't service the injectors, they are a sealed non servicable part. You can remove and refit by yourself. Replace the seals while your at it. You should replace the injector pipes as the manual says because you will have around 30,000psi of fuel pressure through them and if you could damage a pipe or connection without knowing. There's no oring in them too.

So is it not a thing anymore? Like, back in the good old days, I was able to remove the injectors off the engine, take them to a shop where they plugged them into their ultra-sound machine, run some special cleaner through them at high pressure (I'm guessing?), and checked for spray pattern and what-not.

Is that it? The only possibility is to replace the injector? End of story?

[poddy]

Keen to learn more about this too. I heard its $4500-$5000 to get injectors replaced. Waaaaaay exxy!!!

I believe it can easily be that high.
If you pay someone else to do it for you (like a service centre)
If you use the genuine Nissan set of injectors (cheapest genuine Nissan part I found was around $650/pop) $$$ (But the bosch part of e-bay goes for around $320/pop and they are allegedly made in Japan...)
If you replace the whole system, including the common rail, high pressure diesel pipes, low pressure diesel hoses. (The genuine common rail itself is around $0.9k, plus the high pressure pipes are $50-$100 depending on which one)
And if you want to replace the diesel pump with a genuine Nissan part too, you're well over $5k - no questions asked.

With that said, there is an alternative route:
You do the work yourself.
You use the cheaper bosch parts off ebay.
You have the diesel pump rebuilt instead of buying a new one.

[poddy]

There's no oring in them too.

I see what you're saying; What if I was to use a copper washer that fits and torque them high pressure lines to spec, that should do the trick, no?

[mudski]

I see what you're saying; What if I was to use a copper washer that fits and torque them high pressure lines to spec, that should do the trick, no?

Too hard to explain why without showing what the end on the tubes look like under the nut, but no.


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