1999 Volvo Penta "WT" Models Workshop Manual, Page 378Get this manual
PartMarine Products and safety of People Who Use Them
Enjoyable boating is the goal of people who design and build marine productsTo reach this goal, manufacturers are careful to make sureProduct User is informedProducts are safe and reliableIt's up to you, the People whoInstall accessoriesService and Maintain the boatService and maintain the sterndriveto keep the products safe and reliableThis section talks about safe boating and how you can help keep it safeSome things you may know but others you may not
A word about fasteners plain special all screws, nuts, washers and bolts
Do Not Substitute Fasteners