21449 Mercury SCREW, CRANKCASE TO CYLINDER BLOCK (2")

At operating temperature, the engine cooling system is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap on the radiator is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
1. Drain the coolant from the cooling system into a suitable container for storage or disposal. 2. Loosen bolts (10) on water pump drive (9).3. Remove V-belt (8) from the pulley drive on water pump (4) and the pulley on water pump drive (9).4. Loosen two hose clamps (2). Disconnect the hose used between water pump (4) and the water temperature regulator housing at water pump (4).5. Loosen two hose clamps (6). Slide the heater hoses off the fittings on water pump (4).6. Remove coolant water tube (1) from water pump (4).7. Remove bolt (5) and clip from water pump (4).8. Loosen clamp (7) and slide the water pump inlet hose from water pump (4).9. Remove bolts (3) that hold water pump (4) to the front of the engine. Carefully remove water pump (4) and the two O-ring seals from the front of the engine. The following steps are for the installation of the water pump.10. Check the condition of the two O-ring seals used between water pump (4) and the cylinder block. If the seals are damaged, use new parts for replacement.11. Install the O-ring seals in the cover of water pump (4). Put water pump (4) in position on the front of the engine, and install bolts (3) that hold it.12. Connect the short hose used between water pump (4) and the water temperature regulator housing to water pump (4). Secure the hose with two clamps (2).13. Connect the water inlet hose from the radiator to the water pump (4). Secure the water inlet hose with clamp (7).14. Connect the two heater hoses and secure with clamps (6) to water pump (4).15. Install coolant water tube (1) to water pump (4).16. Position the clip and install bolt (5) to water pump (4).17. Install V-belt (8) to water pump drive pulley (9) and the water pump pulley.18. Tighten bolts (10).19. Adjust the tension of the V-belt. Refer to the "Operation & Maintenance Manual" for the correct adjusting procedure. Fill the cooling system to the correct level. Refer to the "Operation & Maintenance Manual" for the correct filling procedure.End By:a. install hoodDisassemble & Assemble Water Pump
Start By:a. remove water pump 1. Remove two O-ring seals (1) from the rear cover of the water pump. Remove four bolts (2) and the washers. Remove the rear cover and the gasket. 2. Put the water pump in a press. Use spacer plates to level the water pump as shown.3. Using a suitable size drive plate from Tool (A) and a press, push the shaft and pulley (3), as a unit, out of impeller (4). Remove the impeller.
Do not allow the shaft and pulley to fall to the floor as it is being removed from seal (5) and the water pump housing. Damage to the shaft and pulley will result.
4. Continue to push the shaft and pulley out of seal (5) and the water pump housing. 5. Using the handle from Tool (B) and a press, remove seal (5) from the water pump housing. 6. Using a press, remove the shaft and bearing assembly from pulley (3). The following steps are for the assembly of the water pump. 7. Using a press, install the shaft and bearing assembly into pulley (3). Install the shaft until it is flush with the end of the pulley. 8. Press the shaft, bearing assembly and the pulley, as a unit, into the water pump housing. Install the unit until the distance between the front face of pulley (3) and the machined surface of the water pump housing is 103.8 0.3 mm (4.09 .01 in). Refer to Illustration D22490.9. Using Tool (C) and a press, install seal (5) in the water pump housing.10. Using a press, install impeller (4) on the shaft of the water pump. Install the impeller until the distance between the impeller and the machined surface of the water pump housing is 0.75 0.25 mm (.030 .010 in). Refer to Illustration D22490.11. Check the condition of the gasket used between the rear cover of the water pump and the water pump housing. If the gasket is damaged, use a new part for replacement.12. Put the gasket and the cover in position on the water pump housing. Install four bolts (2) and the washers that hold the rear cover in position.13. Check the condition of two O-ring seals (1). If the seals are damaged, use new parts for replacement. Install two O-ring seals (1) in the rear cover.End By:a. install water pump