Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 263Get this manual
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Install crankshaft as follows: 1Lubricate crankshaft sealing rings with light oil2Check cylinder block to be sure that dowel pins are in place
aDowel Pins 3Position all crankshaft seal ring gaps straight up4Align hole in each center main bearing race with dowel pin5Gently push crankshaft down into position making sure that the dowel pins are lined up with the holes in center main bearings and crankshaft seal rings are in place6Lubricate crankshaft ends (oil seal areas) with light oil, then install upper and lower end caps ("a" and "b")Secure end caps to cylinder block with attaching boltsDO NOT tighten end cap bolts at this time