2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 236Get this manual
GEARCASE LUBRICANT
LUBRICANT
Draining
IMPORTANT: Gearcase lubricant may be under pressure andor hotIf plug is removed from recently operated outboard, take precautions to avoid injuryRemove the lubricant level plug, then the lubricant drainfill plug, and drain the lube from the gearcase into containerInspect the lube and the magnets on the plugs for metal chips
To check for water contaminationdrain lubricant into suitable glass containerAllow the drained oil to settle for minimum of one hour to determine if there is an abnormal amount of water in the oilSome gearcase lubricants are designed to mix with small amount of water from normal water vapor condensation within the gearcaseRefer to LEAK TEST PROCEDURE on p236Overheated lubricant will have black color and burned odorInternal gearcase inspection is recommended when lubricant is contaminated or shows signs of failure
Filling
Secure the gearcase in vertical positionRemove the lubricant level plug and the lubricant drainfill plug