1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 408Get this manual
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C OA2466
34Remove the high pressure port O-ring35Remove the trim-down relief valve and spring36Clean and inspect the components of the trim-down pump relief valveReplace the rubber sealif necessaryThe seal can be easily removed from the valve with your fingernailPress new seal in place 37Remove the spring from the expansion relief valve 38Using hooked tool, remove the expansion relief valve coreUse caution when using th is tool, as the va Ive seat can be scored by the hooked tool if the hooked portion is too long or has sharp edgesDo not allow tool to slip out of the valve when removing39 Using the hooked tool, remove the expansion relief valve seat40Clean and inspect all the components of the expansion relief valveReplace all O-rings if necessaryacross the front of the 41Remove the three check valves manifold using drag link socket or simi lar toolThese check valves are identicalLocated on the lower port side of the manifold is the tilt trim separation valve Q) Remove the valveThis check valve is longer than the other three check valves42Located under the impact letdown valve is the letdown control pistonUsing pair of long-nosed pliers, remove the letdown control pistonE u