1993 Johnson Evinrude "ET" 40 thru 55 Service Manual, P/N 508283, Page 56Get this manual
Heli-Coillnserts and Installers
L!J threadsThe installation kit consists of drill, tap, and insertion
r:;l Use these Heli-Coil inserts on all models to repair damaged
The 14 mm spark plug inserts are specially made for use in aluminum cylinder headsDo not use substitutes
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