1999 Volvo Penta "WT" Models Workshop Manual, Page 325Get this manual
& Safety Warnings
Before working on any part of the engine or related system, read the section called Safety at the end of this manualReplace any locking type fastener (example: locknut or patch screw) whose locking feature becomes weakDefinite resistance to turning must be felt or locking fastener is not suitable for continued useReplace only with authorized replacement part or equivalent