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  1. #1
    Join Date
    May 2006
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    Finland
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    Default Replacement injector tips - do you typically change them all?

    I've asked the local service engineer to pull out the injectors and have them tested, as the engines have done 800 hours and I thought it prudent to do so after all this talk of melted pistons, etc.

    The engineer got back to me saying that replacement tips were required to all injectors (12 in all, á 100€).

    I find it very hard to believe that all 12 were failing, especially as there were no obvious symptoms of failure. The soot was very reasonable, engines started well, ran smoothly as ever and gave me close to 32 knots.

    I would have thought that only failing ones would be changed, but Is it typical to change them all while you're at it? I'm feeling dubious about this.

  2. #2
    Join Date
    Apr 2007
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    midlands
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    6,815

    Default Re: Replacement injector tips - do you typically change them all?

    Quote Originally Posted by scubaman View Post
    I've asked the local service engineer to pull out the injectors and have them tested, as the engines have done 800 hours and I thought it prudent to do so after all this talk of melted pistons, etc.

    The engineer got back to me saying that replacement tips were required to all injectors (12 in all, á 100€).

    I find it very hard to believe that all 12 were failing, especially as there were no obvious symptoms of failure. The soot was very reasonable, engines started well, ran smoothly as ever and gave me close to 32 knots.

    I would have thought that only failing ones would be changed, but Is it typical to change them all while you're at it? I'm feeling dubious about this.
    When I pulled them way back you will know when they were cleaned and pressures set , the only comfort you can gain is that you will have a 1000 hours run time before you need look again , price isn’t bad either as long as there genuine Bosch and the Chinese Shyte hasn’t crept into your supply chain like it had this end of Europe . Sorry I mean good old British England .

  3. #3
    Join Date
    May 2001
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    ation, Loc: ation, Loc: ation.
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    13,943

    Default Re: Replacement injector tips - do you typically change them all?

    If it's any consolation, all 12 tips of mine needed replacing this summer @700 hours or so.

  4. #4
    Join Date
    Mar 2002
    Posts
    15,423

    Default Re: Replacement injector tips - do you typically change them all?

    Quote Originally Posted by scubaman View Post
    I would have thought that only failing ones would be changed, but Is it typical to change them all while you're at it?
    Afaik it is, at least for some other engines that I know better than yours (Cat & MAN).
    Otoh, there's also a school of thought according to which, as long as you keep a close eye on any possible sudden excess of dark smoke, the old rule "if it ain't broke, don't fix it" is valid also for injectors and their nozzles...
    In fact, I'm aware of a couple of boats with MAN old(ish) mechanical engines which exceeded 3k hours without ever pulling the injectors.
    Though both are actually commercial boats, and according to all the engineers I came across, that does make a difference, because engines regularly used through the year are known to reach hours counts which are unheard of, in pleasure boats.

  5. #5
    Join Date
    Feb 2008
    Location
    Farndon
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    2,270

    Default Re: Replacement injector tips - do you typically change them all?

    Quote Originally Posted by scubaman View Post
    the engines have done 800 hours .
    Modest hours . Almost run in.

  6. #6
    Join Date
    Mar 2002
    Posts
    15,423

    Default Re: Replacement injector tips - do you typically change them all?

    I just posted a comment in another thread related to how to check (albeit empirically) if each injector is working as it should without pulling them out.
    Not sure about how feasible/easy it can be in VP engines, but fwiw you can see here how to do that on MAN V engines.
    Just in case anyone reading this thread and not the other one might be interested...

  7. #7
    Join Date
    May 2006
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    Finland
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    Default Re: Replacement injector tips - do you typically change them all?

    Quote Originally Posted by volvopaul View Post
    When I pulled them way back you will know when they were cleaned and pressures set , the only comfort you can gain is that you will have a 1000 hours run time before you need look again , price isn’t bad either as long as there genuine Bosch and the Chinese Shyte hasn’t crept into your supply chain like it had this end of Europe . Sorry I mean good old British England .
    Thanks Paul, I did remember that you had them checked, but thought it might be a good time to do it again to be on the safe side. I was expecting a similar outcome now and was a bit surprised to have all of them changed... Well, should be good for many years to come as you say. Trouble is that I have no way of knowing where the nozzles came from.

    I'm going to give the diesel shop a call to learn more.

  8. #8
    Join Date
    May 2006
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    Finland
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    Default Re: Replacement injector tips - do you typically change them all?

    Thank you everyone for your replies. It seems that changing them all is more or less business as usual.


    Quote Originally Posted by MapisM View Post
    I just posted a comment in another thread related to how to check (albeit empirically) if each injector is working as it should without pulling them out.
    Not sure about how feasible/easy it can be in VP engines, but fwiw you can see here how to do that on MAN V engines.
    Just in case anyone reading this thread and not the other one might be interested...
    Thank you, P, for the link.

    If i've understood correctly, one of the ways an injector nozzle can give problems is when it starts to spit out droplets (instead of properly atomised mist, so to say). These droplets when combusted on the piston surface can lead to all sorts of problems.

    But in essence, the amount of fuel given out by the injector pump would be the same, it's just that all the energy (and heat) is concentrated on a very small area.

    On the whole, the amount of fuel burned, and the temp of the exhaust gas would be pretty much the same, and something that would be very difficult the tell by measuring the end of the bolt, as per your post on the other thread?

    Wouldn't this apply to even a totally failed, 'hosing', nozzle in an mechanical engine?

    Hope my explanation makes any sense.

  9. #9
    Join Date
    Oct 2007
    Location
    Belgium
    Posts
    4,511

    Default Re: Replacement injector tips - do you typically change them all?

    fwiw,
    some years ago we changed all nozles on our 2 x MAN's that was after 900hrs
    2y ago, we changed all nozzles on both our genny's, afaik they were never changed during >3500hrs

    in each occasion there was a well noticeable improvement on less smelly (grey blue) smoke
    my feeling is that the injectors (and or the nozzles) suffer a lot,
    so for piece of mind when you consider replacing just do them all

  10. #10
    Join Date
    May 2006
    Location
    Finland
    Posts
    2,074

    Default Re: Replacement injector tips - do you typically change them all?

    Thanks Bart!

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