Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 138Get this manual
20Remove and discard a-ring seal from end cap 23Remove crankshaft and place in powerhead stand as
21Remove oil seals from end cap by driving seals out with
a punch and hammer
IMPORTANT: DO NOT remove crankshaft sealing rings from crankshaft, unless replacement of sealing ring(s) is necessaryUsually, crankshaft sealing rings do not require replacement, unless broken
CAUTION
Safety glasses should be worn when removing or installing crankshaft sealing ringsIMPORTANT: DO NOT remove oil pump drive gear on crankshaft unless gear is damaged; I.ecracked, gear eeth chipped or fretting, or excessive loosenessRefer toSection 8" for proper oil drive gear installation procedures