Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 164Get this manual
Selecting New Connecting Rod Bearings 1locate the connecting rod bearing code letter that is scribed on the side of the connecting rod2Refer to the following reference chart to select
the correct connecting rod bearings3Use the color coded connecting rod bearings that match the connecting rod bearing code letter
Installing Connecting Rod Bearings
IMPORTANT: Do not interchange used connecting rod bearingsReinstall bearings in their original position1Clean all the oil from the bearing surfaces on the connecting rod 2Install connecting rod beari ngsMake sure the locking lug on each bearing fits into its notch