I have a 1998 Evinrude 25hp twin cylinder. Awhile back I noticed both of my spark plug threads were starting to strip, so I used a thread chaser to clean the threads, however this only woked for a little while before more drastic action had to be taken.
I then went to Napa and purchased a 14mm cylinder head rethreader kit. It came with an assortment of threaded inserts, a reamer tap, and a small tube of loctite red.
After tapping the holes, I cleaned the threads with solvent, applied the loctite and screwed in the new inserts, after letting the loctite sit up for 24 hours I removed the plugs and torqued them down to 22 ftlbs. I then patted myself on the back for a job well done.
I've come to find out if I run my motor for any length of time the heat weakens the adheasive, and now the insert comes out with the plug. I am also finding out that the quality of the threads you can cut with a reamer tap isn't that great, so you can't use them too many times.
I would like to find a thread adheasive that will hold the inserts in even after repeated heating and cooling cycles.
Any suggestions would be greatly appreciated.
Thanx: Charlie
I then went to Napa and purchased a 14mm cylinder head rethreader kit. It came with an assortment of threaded inserts, a reamer tap, and a small tube of loctite red.
After tapping the holes, I cleaned the threads with solvent, applied the loctite and screwed in the new inserts, after letting the loctite sit up for 24 hours I removed the plugs and torqued them down to 22 ftlbs. I then patted myself on the back for a job well done.
I've come to find out if I run my motor for any length of time the heat weakens the adheasive, and now the insert comes out with the plug. I am also finding out that the quality of the threads you can cut with a reamer tap isn't that great, so you can't use them too many times.
I would like to find a thread adheasive that will hold the inserts in even after repeated heating and cooling cycles.
Any suggestions would be greatly appreciated.
Thanx: Charlie
