Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 133Get this manual
3Refer to section 2A for removal of the following componentsaTiming belt bIgnition Coil cSpark plug 4Refer to section 3A for removal of fuel pump Oil Pump
1Remove oil pump bolts2Separate oil pump from cylinder head
Cylinder Head and Oil Pump Removal
Cylinder Head
1Remove cylinder head cover bolts2Remove cylinder head cover
aBolls (4)
Oil Pump Disassembly
1Heat screws to loosen Loctite sealantRemove screws