28770 Mercruiser NUT (5/16-24)

3. Loosen clamp (4) that holds hose (3) to elbow (1).4. Remove bolts (2) that hold the elbow to the water pump and the cylinder head. Remove elbow (1) from the machine. 5. Remove bolts (5) from the gear cover and remove the cover. 6. Disconnect hose (7) from the bottom of the water pump.7. Remove two bolts that hold the water pump to the timing gear cover. Remove water pump (6).Install Water Pump
1. Inspect the O-ring seal for the water pump and make a replacement if it is damaged. 2. Put water pump (1) in position on the timing gear cover and install the two bolts that hold the pump in place.3. Connect inlet hose (2) to the bottom of the water pump. 4. Install gear cover (3) as shown. 5. Inspect the gaskets for elbow (4). Make replacements if the gaskets are damaged. Put elbow (4) in position on the water pump and install the bolts that hold the elbow to the water pump and the cylinder head.6. Tighten clamp (6) that holds hose (5) to the elbow.7. Install the fan guard.8. Fill the cooling system with coolant to the correct level. See LUBRICATION AND MAINTENANCE GUIDE.Disassemble Water Pump
start by:a) remove water pump 1. Remove bolts (1) and cover (2) from the housing. 2. Loosen bolt (4) approximately .25 in. (6.35 mm). Hit the bolt with a soft hammer to remove impeller (3) from the shaft. Remove bolt (4) and impeller (3). 3. Remove spring (5) and the seal assembly from the shaft. 4. Turn the housing over and remove bolt (6) and washer (7) from the gear.5. Remove gear (9) and bearing (8) from the housing. Remove the bearing and gear assembly. The gear is held in place by two pins on the bottom. 6. Remove bearing (8) from the gear with tool (A). 7. Remove snap ring (10). Remove bearing and shaft.8. Remove bearing from shaft with tooling (B) and an arbor press. 9. Remove O-ring seal (12) and lip seal (11) and seal assembly from the housing.Assemble Water Pump
1. Install lip-type seal in water pump housing with tooling (A). The lip of seal must be toward the water pump drive gear. Put clean SAE 30 oil on the lip of the seal. 2. Turn the housing over and install ring and seal (1) with tool (B). Put clean SAE 30 oil on the lip of the seal and install the ring and seal in the pump housing with the shiny face of the ring toward the impeller. The ring and seal can be installed with hand pressure. 3. Turn the housing and install O-ring seal (2) as shown. 4. Install bearing (3) on shaft (4) with tool (C) and an arbor press as shown. 5. Install bearing (3) and shaft in the water pump housing. 6. Install snap ring (5) to hold bearing (3) in place. 7. Use tooling (D) and an arbor press to install bearing (6) on gear (7). 8. Install gear (7) and bearing in the housing in the position shown. Install a bolt and washer to hold gear (7) in place. 9. Install seal (9) and spring (8) on the shaft. 10. Install impeller (10) and hold it with bolt (12) and a washer. Tighten the bolt to a torque of 28 1 lb. ft. (38.0 1.4 N m). 11. Install cover (11) on the housing with the retaining bolts.end by:a) install water pump