Frequently Asked Questions: I tried to remove the spark plugs on my boat. It looked like the previous owner had not changed them in a long time. I soaked them with penetrating oil for several days. However one of them broke off in the head. The part with the threads is still in the head. I tried an easy out but was afraid it was going to break without any success. Do you have a suggestion?

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FAQ: Ignition System

6. I tried to remove the spark plugs on my boat. It looked like the previous owner had not changed them in a long time. I soaked them with penetrating oil for several days. However one of them broke off in the head. The part with the threads is still in the head. I tried an easy out but was afraid it was going to break without any success. Do you have a suggestion? - Top

I hate to be the messenger of bad news, but (assuming that the "easy-out" option failed) it will almost certainly be necessary to remove your head to remove the broken spark plug.

On the bright side, once the head is off, it is an easy job for any machine shop to drill out the plug, and dress up the threads.

Given the value of an otherwise good quality head, you were wise to stop and think things over a bit before proceeding. Many folks have severely damaged a head before they call for help. - Updated: November 21, 2003

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6. I tried to remove the spark plugs on my boat. It looked like the previous owner had not changed them in a long time. I soaked them with penetrating oil for several days. However one of them broke off in the head. The part with the threads is still in the head. I tried an easy out but was afraid it was going to break without any success. Do you have a suggestion? - Top: I hate to be the messenger of bad news, but (assuming that the "easy-out" option failed) it will almost certainly be necessary to remove your head to remove the broken spark plug.

On the bright side, once the head is off, it is an easy job for any machine shop to drill out the plug, and dress up the threads.

Given the value of an otherwise good quality head, you were wise to stop and think things over a bit before proceeding. Many folks have severely damaged a head before they call for help. - Updated: November 21, 2003

[e-Mail the FAQ's] - [Search our FAQ's] - [Question Not Answered?]