spark plug thread repair

[vintage terror]

i have a 9.9 johnson 2 stroke circa 78'

one of the spark plug blew out and threads are gone

any way to fix this?

[holy mackerel]

heli coil insert available at most autoparts

[NitroMusky]

Pretty sure you have to tap the head to use the heli coils. That means taking the head off so you can clean/remove the metal shavings so they aren't left in the combustion chamber; but that is your best bet.

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[FSNmachine]

Yea helicoils work great but not sure how you are going to get them in without shavings except to take the head off

[vintage terror]

i researched the heli coils and i guess alot of grease on the tap is the best bet for catching shavings.

im not sure if I should try it myself or call a mechanic. thanks for the replies

maybe someone that reads and has any other ideas?

[58Johnson]

Grease on tap is correct. If you miss a little, the shavings are aluminum and very soft. I've done several and never removed the head.

They are pretty easy to do yourself.

[t2al]

You can flush it of with a shopvac or blow it out with compress air. done it many time on car engine

[58Johnson]

Here is a Duckworks article on the repair:

http://www.duckworksmagazine.com/10/howto/plug/index.htm

[Fish Hunter]

When you break the s/s tang off, make sure that is removed as well.

Small needle-nose pliers work well, if the head is left on.

[vintage terror]

thanks everyone, got the kit and will let you know how it worked in a few days

[vintage terror]

worked great, bought the kit 30 bucks. installed it, used alot of grease and even tilted the motor on its side while i tapped it.

fired right up and runs great

thanks again