Overkill82k5
Petty Officer 3rd Class
- Joined
- Jul 29, 2009
- Messages
- 78
Has anyone ever had a spark plug separate on them while running?
I took the family to the local swimming hole on Monday. On the way home we were running about 3/4 throttle when I heard a loud bang and a hissing sound in time with the engine rpm's. I shut the motor down to investigate (thinking I blew up my motor) and found a plug wire just hanging solo. A minute later I found the porcelain insert part of a spark plug in the bilge. The metal threaded part and cathode were still in the head, but the center porcelain part got spit out. It was the strangest thing I've ever seen.
We limped the rest of the way home not knowing how much damage there was to the engine.
Once home I pulled the threaded part out and inspected it. It was in perfect shape except for missing the porcelain center. I replaced the plug and the motor fired and ran well. I've also since replaced the other 7. I was just curious if this may be an indication of some deeper issue that may need attention before I do blow it up or if it's was likely just a bum plug.
The motor is a mercruiser 260 that I rebuilt in 2011. Had zero issues til this. The spark plug was a Champion RV8C. I changed to Bosch plugs, hoping it was just a faulty plug issue.
Any thoughts/ideas?
I took the family to the local swimming hole on Monday. On the way home we were running about 3/4 throttle when I heard a loud bang and a hissing sound in time with the engine rpm's. I shut the motor down to investigate (thinking I blew up my motor) and found a plug wire just hanging solo. A minute later I found the porcelain insert part of a spark plug in the bilge. The metal threaded part and cathode were still in the head, but the center porcelain part got spit out. It was the strangest thing I've ever seen.
We limped the rest of the way home not knowing how much damage there was to the engine.
Once home I pulled the threaded part out and inspected it. It was in perfect shape except for missing the porcelain center. I replaced the plug and the motor fired and ran well. I've also since replaced the other 7. I was just curious if this may be an indication of some deeper issue that may need attention before I do blow it up or if it's was likely just a bum plug.
The motor is a mercruiser 260 that I rebuilt in 2011. Had zero issues til this. The spark plug was a Champion RV8C. I changed to Bosch plugs, hoping it was just a faulty plug issue.
Any thoughts/ideas?
