OEM OMC Johnson/Evinrude lock plate (307578) prevents crankshaft cap screw loosening in 1975+ models. This genuine stamped steel retention washer resists engine vibration.
307578 OMC LOCK PLATE
€ 14,95
OMC lock plate part number 307578 for Johnson/Evinrude crankshaft and piston assemblies. Anti-rotation fastener component used to prevent cap screw loosening in 1975+ Evinrude 4-cylinder outboard engines. Replaces 0304442. Stamped steel lock washer with tabs or mechanical retention features. Installed under cap screw heads in upper crankcase; essential for engine assembly integrity and vibration resistance on vintage Johnson/Evinrude motors.
1 in stock
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