1993 Johnson Evinrude "ET" 40 thru 55 Service Repair Manual, P/N 508283, Page 153Get this manual
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113 mm(12"j
10mm(3S"j
Safety Warning
2S mm(11S"j
Cold Roll Steel Heat treatment: Carbonize 0,3-0,5 mm(0.015-0.020 in deepQuench and harden to 58-62