1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 12Get this manual
Flushing Outboard Cooling System
bFlush until discharged water is clearIn saltwater areas, run outboard to minutescStop engine before turning off water
When flushing, be certain that area in vicinity of propeller is clear and that no person is standing nearbyto avoid possible injuryIt is recommended to remove propeller as precautionary measure
6Stop engine, turn water off and remove flushing attachment from gear housingIMPORTANT: While and after flushing, keep outboard in upright position until all water has drained from drive shaft housing to prevent water from entering the powerhead via drive shaft housing and exhaust ports
1Install Quicksilver Flushing Attachment (44357A2) [or equivalent tool] on the gear housing from the FRONT side, positioning the rubber cups over the water intake openings
Following Complete Submersion
Submerged engine treatment is divided into distinct problem areasThe most critical is submersion in salt water; the second is submersion while runningSALT WATER SUBMERSION (SPECIAL INSTRUCTIONS)