Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 335Get this manual
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POWERHEAD
40 37 36 35
41 32 33 44 43 34
2-4-C With Teflon (92-825407A12)
A Tighten and back off 12 turn Stud must come through nylon on nut