1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 117Get this manual
Assembly 1Position the spring and washer onto the plunger shaft2I nstall three new a-rings onto plunger shaft 3I nstall new a-ring onto the end cap and position the end cap onto the plunger shaft4Insert plunger shaft and end cap into primer pump housingReinst all retainer clip5 Position primer pump clamp Tighten primer mounting nut6To bench test the primer pump after assembly, connect inch piece of hose to the large nipple and place the other end of hose in container of alcoholPlace hose on the small nipple and place other end of hose to drain into containerHold primer pump in horizontal position as it would be installed on the engineMove plunger back and forth ten timesPrimer should pump approximately 10 cc of alcohol in 10 strokesIf pump fails to pump alcohol, disassemble and check for missing, cut or split a-rings or damaged check valvesInstallation 1I nstall fuel inlet hose onto primer pump housing2Secure hose with new ie strap3Attach primer pump to lower engine cover using two screwsTighten screws to torque of 7-9 Nm (60-80 inIbs4Attach primer hose to top of pump5 Reconnect fuel hoseCheck for leaks by connecting fuel tank line to motor and squeezing primer bulb until definite pressure is felt in the bulb