Donnie- just out of curiousity, what SPARK PLUG and GAP was running in the engine?
Donnie- just out of curiousity, what SPARK PLUG and GAP was running in the engine?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Running NGK IZFR6J gapped at .043. This set had 16 hours on them.Originally Posted by EuropeanAM
What did the previous set look like (and how old/how many hours on those)? Electrode and arm intact on the last set?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
I went back and looked at the plugs that came out of it and couldn't see tell tale signs of any problems, in fact the old plugs looked really good. Checked the gap and the gap is still at .043. I change the plugs every 100 hours so those had 100 hours on them. That's why I think it's a shame for this to happen with just 316 hours.
Last edited by Donnieb; 11-11-2019 at 03:02 PM.
Will be interesting to see some pictures when that head is removed.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Don sent you some photos to your e mail address, let me know if you get them.
Trying to send them from my phone, don't think they are going through, Send me a good e mail addy and I will send them again
Last edited by Donnieb; 11-11-2019 at 05:45 PM.
If you would, try posting those pictures here, or on a sharing site such as Shutterfly (my email storage costs are starting to break the bank).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Sorry Don but I have no idea how to post pictures
Select Insert Image. The rest should be self-explanatory.
Last edited by EuropeanAM; 11-12-2019 at 04:36 PM. Reason: Makeum Big Picture.
"Better to remain silent and be thought a fool than to speak out and remove all doubt."
That's about the best I could do
Thanks BruceSelect Insert Image. The rest should be self-explanatory.
I think you'll find the problem started IN THE CRANKCASE (oil line problem, rod bolt failed, etc). The piston damage may have been an "aftermath" situation (and it does NOT appear that the cylinder was "lean").
Ring definitely hung in the port, but this usually does not result in a broken rod.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
well I guess it doesn't matter at this point what came first the chicken or the egg, Mercury has said they won't help.Just a shame as I have said before that a motor with low hours and taken care of like this one was to go like that. Mercury said that if it was a mechanical issue it would have shown up way before 300 hours. Maybe so I don't know.
In this case what would the chain of events be to cause the ring to hang?
Debris lodged between piston and port.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
What kind of debris may be a reed?
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