Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 147Get this manual
fgh Continue to heat water until thermostat is completely open Unplug thermostat testerReplace thermostat, if it fails to open at the specified temperature, or if it does not fully open
NOTE BE SURE that water in thermostat tester is allowed to cool sufficiently [below 130" (56" C)) before testing the other thermostat
A torque wrench is essential for correct reassembly of powerheadDO NOT attempt to reassemble powerhead without using torque wrenchAttaching bolts for covers, housings and cylinder heads MUST BE torqued by tightening bolts in progressive steps (following specified torque sequence) until specified torque is reached (see pie,n following)EXAMPLE: If cylinder head attaching bolts require torque of 20 lbft(27.1 N'm), a) tighten all bolts to 1bft(6.8 Nm)following specified torque sequence, b) tighten all bolts to 10 lbft (13.5 N'm)following torque sequence, then finally c) tighten all bolts to 20 lbft(27.1 N'm), following torque sequence
IMPORTANT: If oil pump drive gear has been removed from crankshaft, GEAR MUST BE REIN STALLED WITH GEAR FLANGE FACING DOWN TOWARDS BALL BEARING1Slide oil pump drive gear (flange facing down) onto crankshaft Align slot in gear with keyway on crankshaftSeat gear against counter weight shoulder