1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 118Get this manual
POWERHEAD REASSEMBLY Place cenlermai crankshaft roll er bearings on upper and lower main bearing journals as shownInstall ce nt ermain bearing races as shown
Secu re cenlermain bearing races (a) together with retaining ringsMak sure retai ning ring bridges the separa ting lines of Ihe bearing race