1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 199Get this manual
3Clean all sealant from the threads on the two upper mount bracket to steering bracket screwsSpray threads of screws with GMC Locquic PrimerApply GMC Nut Lock to threads of screwsPosition the swivel bracket assembly on the exhaust housing Install the two upper mount bracket screws and mount link Tighten screws to torque of 96- 120 in Ibs(11-14 Nm)Use extreme caution when installing the upper mount bracket screwsBe careful not to pinch or tear the seal IZ]
4 Place the lateral mounts in the lower mount bracketsApply GMC Gasket Sealing Compound to threads of lower mount bracket screwsInstall the lower mount bracketsTighten screws to torque of 60-84 in Ibs(7-9 Nm)
f81 5Position new idle relief muffler gasketInstall the muffler to the exhaust housingTighten the screws to torque of 48-60 inIbs(5-7 Nm)6Position the lower engine cover on the exhaust housing