1974 Johnson 135 HP Outboard Motors Service manual, Page 123Get this manual
9-11 gDisassemble relief valve by removing snap ring from hex housing with tru-arc pliershRemove valve housing from valve guideHold valve guide from turning during disassembly by engaging slots in flange with hacksaw blade iUnscrew piston rod from loop by engaging holes in piston with span-
ne wrench (Special Tool 11 22727 or 1122728)jRemove end cap [rom piston rod and discard Internal and external
"0" rings and wiperk Piston should be removed fr om pi st on od only if necessary for service1Us stem valve socket wrench (Special Tool H122729) emove te valve assembly from cylinderDiscard "0" ring under tem
mRemove upper oil line from cylinder and band only If necessa ry
CLEANING, INSPECTION AND REPAIR
Clean cylinde and components in solvent and dry thoroughly Examine cylinder for scoringReplace if badly scored or worn