1977 Evinrude 55 HP Outboards OMC Service Repair Manual P/N 5307, Page 59Get this manual
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(3) Worn, galled, or abraded surfacesThese caused too 100se fit, or bearing 10cked dirt and turning shaft or in housil1gWORN RING GROOVES
Check the pistol1s for roundness, excessive skirt