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ok, i have a 99 bayliner with a 3.0 liter 4 cylinder i/o. i was doing a tune up and the last plug was rusted in pretty good. i chipped away at the rust so i could get the socket on it. i soaked the plug for about 2 hours with PB blaster to help break the rust. anyway, the plug snapped off at the block. cheapest marine mech. out here is about 70 bucks an hour. anyone got any sure fire ideas how to remove lower half of plug without having to take head off????
just a thought and ive never tried it,on a boat engine,but try to drill a hole in the center of the plug,and using the right size e z out.do not go all the way through the plug when drilling as that will put shavings in the cylinder and then you will have to pull the head any how. is there enough room to try to weld a bolt to the plug? you can that way have something to keep trying to turn the plug out.and keep saoking wih the penetrant,also a little heat may help to break it free. good luck.
im not sure if its cast iron. i dont think it is. as far as welding a bolt on it, it has a porcelain core. i have very limited room for a torch. but thats a great idea.
If it turns out you have to drill, coat the drill bit with heavy grease. Most of the metal shavings will stick to it. Drill slow, clean and recoat often. If it's that tight it sounds like a aluminum head and steel plug with no antiseize. If that is the case you will probably pull the threads out with the plug. Locate a heli-coil for the spark plug threads before you start.
PB Blaster works but it can take up to 18-24 hours for a seriously seized part to be freed. I was working on a cam chain tensioner on my motorcycle and let the bolt sit for 2 hours, tried to unscrew it, and it wouldn't budge. I let it sit overnight and it was very easy. So YMMV.
This happened to me a few years back on an old pickup. I used an ez out. My ez out fit right in the plug opening and gripped what was left of the plug. In fact about six or seven of the eight plugs broke and they all came out ez with the ez out. They were in there a long time. I think after the 2nd one broke I actually welded the ez out to a socket and that worked good. But you only have one so you don't have to do that. Soak it with PB for awhile. My porcelain cores must have broken away because they were not in the way.
I Over Tightend My Spark Plug And It Snaped In The Hole How can i Get It Out Please Helpp
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