Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 221Get this manual
GEAR HOUSING
Zinc Anode
1Secure zinc anode with boltTorque bolt to 70 lb-in(8 Nm)
aZinc Anode (1999)BoltZinc Anode (2000 and Later)
Water Pickup Screen
1Secure pick-up screen using screw