1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 89Get this manual
GENERAL INFORMATION PowerheadDisassembl y" ndReassembl y" insl ructions are printed in seque nce that should be followed to assure best result when removing or replacing power head component sIf complete disassembl is not necessary, sta rt reassembl at poi III disassembly was stopped(Refer 10Index", precedi ng Usually, complete disassembly of powerhead will be requ iredIf major powerhead repairs are to be performed remove powerhead from drive shaft ho usi ngRemoval of powerhead is nol requ ired fo I) inspecti on of cylinder walls and pistons (refer toPo we rh ead Remo val and Di sasse mbl y"fo llowing, and remove cylinder heads and exhaust covers), 2) minor repairs on componen ts, such as ignition systemcarb uretorsreed block and cylinder headsand hecking operati on of thermos tats