Spark plug for Johnson 60 (1983) with 18mm thread

[akeake]

My old Johnson spitted out its champion QL77JC4 plug and my Helicoil repair came out as well...
Now I wonder if there is a plug with 18mm thread that I could use instead of this 14mm standard plug (the local repair shop can drill me 18mm thread but they did not have ideas about plugs to fit in it)

 

[wilde1j]

Re: Spark plug for Johnson 60 (1983) with 18mm thread

Replace the head. See Salvage Yards under Top Secret Files. Fitting a plug is not the issue ... you must run the right one.

 

[seasprayralph]

Re: Spark plug for Johnson 60 (1983) with 18mm thread

Hi, this might be the best solution to your problem,, good luck

http://www.locknstitch.com/sparkpluginserts.htm

 

[wilde1j]

Re: Spark plug for Johnson 60 (1983) with 18mm thread

He doesn't have enough remaining metal. The hole could be welded and retapped for the correct size or replaced.

 

[akeake]

Re: Spark plug for Johnson 60 (1983) with 18mm thread

Thanks for your consultations. I opened the head and the gasket in the top cyl is faulty and the thermostat is broken. Ill take the head to the shop for welding - lets see if the motor will run ever again.