2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 164Get this manual
Upper case
Checking the oil strainer
1Check the oil strainer for dirt or residueClean if necessary
Assembling the oil pan
1Install new gasket onto the exhaust guide 12Install new gasket and the oil strainer onto the exhaust guide, and then tighten the bolts to the specified torque