Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 365Get this manual
RIGHT HAND NON-RATCHETING
7Remove locknuts from bottom middle of anti-cavitation plate
aBolt (Secures Trim Tab)Bolt (Inside Trim Tab Cavity)Locknuts and Washers 8Remove locknut from the front gear housing mounting stud9Loosen the side mounting locknuts(DO NOT attempt to remove one nut before opposite side is loosened sufficiently, or driveshaft housing could be damaged 10Pull gear housing away from driveshaft housing as far as the loosened nuts (in Step 9) will allow, then remove loosened nuts(DO NOT allow gear housing to fall, as it now is free 11Pull gear housing from driveshaft housing