Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Optimax spark plug change/Why?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Optimax spark plug change/Why?

    Just because you can doesn't mean you should.

  • #2
    Re: Optimax spark plug change/Why?

    If it matters to you that much, you should call customer service at Mercury Marine Fon du Lac, Wi. 920-929-5000 is the switch board or your local dealer should have a service bulletin on the change.

    Comment


    • #3
      Re: Optimax spark plug change/Why?

      Well, Laddies, it all started like this. I read somewhere that the right spark plug with the right gap was important. Since that time I have posted the same basic question several different ways and still have not had anyone weigh in on it.

      In this instance, - what does it take to make a difference? Is one plug better than another. If so, why? If not, why not? And how much variation in gap makes a difference?

      I've gotten NGK/s view (which is apparently what it is - a view) and I've gotten Merc's specs. There are discrepancies. Are those discrenpanies important - or meaningful at all?

      I just got curious and depend on you folks for enlightenment.

      Now I've gotten curious to know why no one has commented in numerous previous posts. If you are able to enlighten me, why haven't you done so? If not, why are you not interested in the subject?

      Interestingly enough, of the two merc dealers I contacted, neither had a clue nor were they interested enough to refer to any service bulletin. I guess they go to the shelf, get the specified plug, and install it. And, apparently that works or there would be all sorts of conversation about it.

      I'm going overboard with this, aren't I?

      Thanks for the suggestion and the number. I'll follow up with that and post what I find out.
      Just because you can doesn't mean you should.

      Comment


      • #4
        Re: Optimax spark plug change/Why?

        Ok, I don't have any current contacts at Mercury, we all got old and are retired but L made a couple of calls and this is all I could come up with. The first is a link for service bulletins all you need to do is mark the type and year at the top of thr page. http://www.ishopmarine.com/ishop/jsp...smBcatList.jsp
        The second I think may anwser your question as it.s all I can find althougth in the bulletins there are dealer call numbers, that we can't use dealing with fouling. http://www.ishopmarine.com/ishop-cat...2002/EN_22.PDF

        Comment


        • #5
          Just because you can doesn't mean you should.

          Comment


          • #6
            Re: Optimax spark plug change/Why?

            I just tried your second link which is, of course, a repeat of what I've just posted.

            So - new question. Why wouldn't merc address the issue of mixing plug re gapping? Seems to me that it would make a difference. Maybe now is the time to call Merc.

            I didn't know that you were an old merc man. I should have realized given all the posts I've researched with your name on them.

            Thanks for helping me follow through on this.
            Just because you can doesn't mean you should.

            Comment


            • #7
              Re: Optimax spark plug change/Why?

              LOL

              You could ask six different engineers this same question and get six different answers!

              But it always come down to MONEY, the bean counters at the corporate level have determined that Merc can buy the newer plugs from NGK in quantity for less than the old one.

              That AND specifying the more expensive plug, causing NGK's sale #'s on that unit to rise, sweetens the deal NGK gives to Merc.

              Comment


              • #8
                Re: Optimax spark plug change/Why?

                I just contacted the service dept in Wisconsin and was told that it didn't make since to mix and mingle the two different plugs. The iridium plug burns a little bit differently ("crisper" he said) and requires a different gap. As to the service bulletin he wouldn't comment and didn't seem interested in why service bulletin would say it was ok to mix the two or why there was no mention of gap changes if you did.

                It still seems to me that merc has put out a service bulletin that does not adequetly address the situation. My inclination is to follow this to the ends of the earth but since it does not impact me I guess I'm going to have to let it go.

                Thanks for going this far with me.
                Just because you can doesn't mean you should.

                Comment


                • #9
                  Re: Optimax spark plug change/Why?

                  CharlieB hit the nail on the head.
                  With spark plugs, on any engine, Ideally you'd have the gap as large as possible. But the bigger gap you have, the more voltage you need to fire the plug. Merc makes rolling line changes all the time for hundreds of reasons. Some for money, some for product reliability, some for product performance... so on, and so forth.
                  It also take more voltage to fire off a platinum or iridium plug, than it does a standard plug. If merc feels that their ignition coils can reliably fire a different plug, a bigger gap, platinum or iridium, then they will make a line change.
                  If merc gets a better deal on 1 plug or another, and if it will not adversly effect performance.... they make a line change.
                  Maybe the guy you talked to didn't know why there was a service bulletin in the first place. Merc as a company has had thousands of service bulletins over the years, for thousands of different reasons. You can't expect 1 guy on the phone to know them all.
                  Sometimes I pretend I that I don't know what makes sense and what doesn't. I just follow what 10 engineers decided to put in a service bulletin.... and I usually don't have a problem.
                  just because you found it that way does not mean it is supposed to be that way.

                  Comment


                  • #10
                    Sign up today
                    Re: Optimax spark plug change/Why?

                    I just changed the plugs in my 04 150 optimax. When i got to the no. 2 cylinder,. The electrode on that plug was just about burned up and the insulator had a green tint on one side. All the other plugs were the same. I use the NGK Iridium IZFR5G. What would cause that plug to be different? Thanks

                    Comment

                    Working...
                    X