1978 Johnson 55 HP Outboards Service Manual, Page 67Get this manual
(3) Worn, galled, or abraded surfacesThese may be caused by too loose fit, or bearing locked by dirt and turning on shaft or in housingWORN RING GROOVES
(4) Badly discolored rollers and racesThis is usually due to an inadequate supply of lubricantModerate discoloration is not cause for discardfReplace top crankcase bearing seal and "0" ring
WARPED RING INSUFFICIENT GAP
gLower crankcase seal and "0" rings should be replacedPISTONS