injector service

Submitted: Monday, Aug 18, 2003 at 21:29
ThreadID: 6668 Views:1657 Replies:3 FollowUps:0
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My GU 2.8 is coming up to 110000k. I am quite happy with its performance as it has taken us everywhere we have wanted to go. My question is "when should injectors be serviced?" I have had some differing advice and would like to hear the experiences of others.

regards JIm
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Reply By: Truckster (Vic) - Monday, Aug 18, 2003 at 21:36

Monday, Aug 18, 2003 at 21:36
It wouldnt hurt at 100,000, one place told me every 20,000, I laughed and walked out...

its around $65-80 per injector+ Labour...
AnswerID: 28368

Reply By: Hugh - Monday, Aug 18, 2003 at 22:45

Monday, Aug 18, 2003 at 22:45
Hi Jim,

I have a GU 2.8 which will reach 110,000 km this week. Great unit for touring.

Anyhow, back to injector nozzles. Mine have yet to be checked and still running fine, similar to yours. A check of the factory manual reveals the maintenance interval to be 40,000 km (with a note). The note reads "If engine power decreases, black exhaust smoke is emitted or engine noise increases, check and, if necessary, adjust the fuel injection nozzle's pressure and the fuel spray pattern". I take the note to mean "if it isn't broken then don't fiddle with it".

Nissan schedule all major service at 40,000 km intervals so perhaps 120,000 km would be a good time to have the injectors checked. If you do have them checked likely best to take them to a recommended diesel injection specialist. I'm lucky enough to work for gasoline injection R&D company with a fuels labs to do myself. Things to test are 1) initial injection pressure (pressure adjusted by shims over spring); 2) tip leakage (deposits or nozzle damage from poor servicing can lead to tip leak under pressure); and 3) spray pattern (deposits can affect spray shape similar to gasoline port injectors - should be symmetrical and uniform distribution).

When serviced be sure to have the nozzle gaskets replaced. The lower is also a combustion chamber seal and is shaped to take a crush on preload (has to be installed correct orientation). There was an earlier post where these weren't replaced and the guy had very noisy injectors. Anyhow, I'm sure all this will done by a reputable business.

AnswerID: 28377

Reply By: colin - Friday, Aug 22, 2003 at 15:17

Friday, Aug 22, 2003 at 15:17
i have a 92 4.2 patrol with 260,000ks i have never touched the injectors or pump, it doesnt blow any smoke or any loss of power, every couple of months i throw a double dose of injector cleaner through and at every sevice which is 5,000ks on my vehicle i change the fuel filter, some say this is an over kill, but the prove is my vehicle runs sweet as, and keeps up with most modern diesals. Col
AnswerID: 28746

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