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Discussion Starter #1
hello guys, its been a while now that i've noticed a strange ticking coming from the top of the engine.
I don't know too much about mechanics but after some research it seems that it might be related to fueling?
I took it to my mechanic and he said that its normal for a diesel and to bring it back if it gets worse.
I am about to move interstate with a trailer and I would like to get all the problems with the rig sorted before I go.
since my mechanic mostly deals with petrols I was wondering if i should take it to Nissan and let them tell me whats wrong or should I ask my mechanic to test injectors and rule out things as we go?
thanks guys
 

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GUII ZD30DI Wgn
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hello guys, its been a while now that i've noticed a strange ticking coming from the top of the engine.
I don't know too much about mechanics but after some research it seems that it might be related to fueling?
I took it to my mechanic and he said that its normal for a diesel and to bring it back if it gets worse.
I am about to move interstate with a trailer and I would like to get all the problems with the rig sorted before I go.
since my mechanic mostly deals with petrols I was wondering if i should take it to Nissan and let them tell me whats wrong or should I ask my mechanic to test injectors and rule out things as we go?
thanks guys
With a long screw driver placed against the skull behind the ear you can move the tip along parts of the engine to establish a location of strange sounds. Not easy to get all spots but maybe able to tel top, side, back or front, sounds move around so much under normal hearing.
 

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Discussion Starter #4
Thanks mate , i tried that and i can hear it from the top/ front but the most ticking i was able to hear was from the top of the injectors, thing is, i was able to hear the same tick from all the injectors.
Would that mean that is something internal and its not the injectors?
I think its worth getting the injectors tested and i am not sure where to go,
My mechanic or nissan.
What do you guys wreken?

Thank you all so much!
 

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GUII ZD30DI Wgn
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Yes, Injectors can be noisy, where are you located? we may be able to recommend a place to remove and test injectors, not a big deal.
 

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GUII ZD30DI Wgn
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Won't need to replace fuel lines and rocker gasket usually survives at least one removal, injector seals probably will need to be replaced as well as glow plug seals if there has been a bit of crap around the rocker cover. It isn't a hard job removing injectors, time consuming if you have never done it before. I don't know if you have done it already but download the factory workshop manual from the DI archives (post #9), it cover all the way to late model CRD.
 

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Discussion Starter #9
Good day guys, my mechanic said that he can't really test the injectors, and if they are the originals its worth changing the set anyway, what do you think? Should i just bring it to nissan? Or does anyone know someone honest and reliable in adelaide that deals in injectors ?
Thanks again
 

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GUII ZD30DI Wgn
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CRD Injectors are not cheap so you need to be sure, sorry, I don't know anyone in SA that does pumps and injectors, maybe someone else can help there. Maybe a diagnostic by Nissan could help but be aware they will probably try to sell you more stuff.
 

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Discussion Starter #13
Gday mate, i just spoke to nissan and they said they dont test injectors, they recomended mtq engine sistems and hi tech diesel, i will let you know how it goes hopefully i will find a good one and the next person with my situation in adelaide will know where to go 👍
Thank you again
 

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Hi everybody from Austria,

Regarding the Injectors there are a few tricks where you can find out if the injectors are to blame. First, you can measure the amount of fuel that comes back from the Injectors return fuel lines. Here in Europe I bought this kit for some AUD 30 and the test is really simple. You disconnect the return line (which is on top of each injector) and you put in this hose which goes to s small reservoir.
The amount of Diesel that should come back from the Return line within 2 Minutes is about 25ml per Injector. Within the last years I have made this test with every oil service and I have recorded the data so if you have 25ml the chance that the injector(s) is / are ok, is fair good.

This test takes you about 1 hour. The clips which are on top of the injector shall not be taken out - just push them in and disconnect the fuel line.
This is how the Test kit looks like:


And this are the results after I have installed new Injectors into my car (cleaned, tested and all moving parts new).


What I have done regularly to clean the Injectors (with every Oil Service) is the Liqui Moly Diesel Purge. For the case that one of your injectors is contaminated they can be cleaned with this (or any other) Injector cleaner.

You just disconnect the Fuel Line after the Fuel Filter (the line which goes into the Engine) and you disconnect the Fuel Line (on the fuel filter) which comes from the Engine. Both tubes have to be extended into a bin with Liqui Moly Injector Cleaner (or anything else you trust)..
Then you start the engine and the Engine takes only the Injector Cleaner to run - into the engine and back into the bin.
If everything is ok with the injectors - the Engine consumes within 5 Minutes exact 100ml (no aircondition on !).

Once I had a faulty injector and both, the amount of fuel from the return line was too high at two cylinders and the amount of consumed fuel within 5 minutes from the Diesel Purge test was also too high.
After this test - I do let the engine burn / take another 500ml Diesel with some 2 Stroke Oil from this bin.

Here is my video about this Injector cleaning:
This Injector cleaning takes about 35 Minutes.

If this noise is still there or you haven´t checked the Injectors for the last 100.000km´s, you could take them out and bring them to a Injector Specialist. Myself, I take them out once a year, I clean them in an ultrasonic cleaner, then I put them into a Diesel Pressure device and I activate the Injector with a Common Rail Tester to check if the Injectors drop Diesel and how they spray in certain frequencies.

Here are the necessary infos for taking out the Injectors and putting them in again. Hope this helps.

Cheers from Austria (the small county somewhere in Europe with some Mountains around :), and sorry for any mistakes in my English language!








 

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Gday mate, i just spoke to nissan and they said they dont test injectors, they recomended mtq engine sistems and hi tech diesel, i will let you know how it goes hopefully i will find a good one and the next person with my situation in adelaide will know where to go 👍
Thank you again
Hi Tech Diesel do amazing work.
 

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Discussion Starter #17

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Hey mate, this is unreal! I actually found the same kit.

Sounds easy enough to do it my self to be honest.
This will be very useful to many people I'm sure.
Thanks champ!
Yes, this is the kit I am also using.

I do have a Bosch Document (regrettably only in German language that says the following) where is is described how to do the Test (see attached).

The amount of Diesel that comes out of the return line should be as follow: The difference between the Injector with the lowest amount of reflow to the Injector with the highest amount of reflow should be maximum three times higher.

See page 5 on the attached document where the reccommendation is to replace (repair) Injector 1, The longer you let the engine run, the better you can see the difference. 2 Minutes are enough to see how the injectors bring back Diesel.

Diesel should always come back in drops and should never "flow" out of the return line.

My tip to see good results is as follow: Start the engine, let the return lines fill with Diesel (empty the small bins so that there is no Diesel in it), and then start the test run for about 2 Minutes.
 

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