Has anyone ever heard of ?spark plug failure? on a boat? We had our 1989 Sea Ray 220DA with 5.7 Mercruiser out yesterday and had a spark plug fly out of the head (see attached photo). The failure appears to have occurred internal to the plug but it is likely that the plug was lose, as it came out of the head with only a few turns.
We had the boat out Saturday as well and it ran fine but on the way home it felt like I had a little bit of hesitation that felt like bad fuel, so I didn?t think much of it. Aside from this there were no warning signs.
Has anyone ever had this issue before? I?m heading back to the boat this afternoon with a new spark plug but before I run it too much, I?d like to see if there is anything else I should look at. I?m not 100% sure if the threads for the spark plug are stripped or not, but assuming I can get the plug in, is there anything else I should keep an eye out for? I started it up for ~10 seconds and there was definitely compression coming from the spark plug hole?
We had the boat out Saturday as well and it ran fine but on the way home it felt like I had a little bit of hesitation that felt like bad fuel, so I didn?t think much of it. Aside from this there were no warning signs.
Has anyone ever had this issue before? I?m heading back to the boat this afternoon with a new spark plug but before I run it too much, I?d like to see if there is anything else I should look at. I?m not 100% sure if the threads for the spark plug are stripped or not, but assuming I can get the plug in, is there anything else I should keep an eye out for? I started it up for ~10 seconds and there was definitely compression coming from the spark plug hole?