Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 225Get this manual
General Information Powerhead "Disassembly" and "Reassembly" instructions are printed in sequence that should be followed to assure best results when removing or replacing powerhead componentsIf complete disassembly is not necessary, start reassembly at point disassembly was stopped(Refer to "Table of Contents," preceding If major powerhead repairs are to be performed, remove powerhead from drive shaft housingRemoval of powerhead is not required for 1) inspection of cylinder walls and 2) minor repairs on components such as ignition system, carburetors, reed blocks, cylinder heads and checking operation of thermostats