Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 145Get this manual
3Torque bolts in sequence and in two steps55786
3Refer to section 2A for installation of the following componentsaTiming belt bIgnition Coil cSpark plugs
4Refer to section 3A for installation of fuel pump5Install flywheel cover
Cylinder Head Bolt Torque Center Bolts Oty6 (Larger DiaM9) 151: 17 lbft (23 Nm) 2nd: 34.7 lbft(47 Nm) CylHead Flange Bolts Oty3 (Smaller DiaM6) 151: 53 lbin(6 Nm) 2nd: 106 lbin(12 Nm)