30720 Mercury SCREW, WATER PUMP BODY TO GEAR HOUSING (2 1/4")

Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7575 Link Bracket 2
B 2P-8312 External Retaining Ring Pliers 1 Start By:
Install the wheel chocks. Refer to Disassembly and Assembly, "Wheel Chock (Front and Rear) - Remove and Install".
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
Install caps and plugs on all openings in order to prevent dirt or debris from entering the system. Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal components.
Position a suitable container under the radiator drain valves in order to contain the coolant for storage or disposal. Drain coolant from the radiator until the level is below the level of the expansion tank. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct procedure.
Illustration 1 g00592039
Remove three bolts (1) and the washers that hold cover (4) to expansion tank assembly (3) and platform (2). Repeat this procedure for the remaining cover on expansion tank assembly (3).
Illustration 2 g00592043
Disconnect wire harness (6) at the electrical connection. Remove bolt (5), the washer and the clip that holds wire harness (6) to expansion tank assembly (3). Place wire harness (6) aside.
Remove level switch (7) from expansion tank assembly (3). Disconnect hose assembly (8) from expansion tank assembly (3). Repeat this procedure on the remaining side of expansion tank assembly (3).
Illustration 3 g00592045
Remove four bolts (9) and the washers that hold tube assembly (10) to expansion tank assembly (3). Place tube assembly (10) and the rectangular seal (not shown) aside.
Illustration 4 g00592046
Remove four bolts (11) and the washers that hold tube assembly (12) to expansion tank assembly (3). Place tube assembly (12) and the rectangular seal (not shown) aside.
Illustration 5 g00593858
Attach Tooling (A) to expansion tank assembly (3), as shown. Position a suitable lifting device to Tooling (A). Secure the lifting device to a hoist.
Remove ten bolts (13) and the washers that hold expansion tank assembly (3) to platform (2). Remove expansion tank assembly (3) from platform (2). The weight of expansion tank assembly (3) is 97 kg (214 lb).
Illustration 6 g00592237
Remove five bolts (14) and the washers that hold relief valve cover (15) to expansion tank assembly (3). Remove relief valve cover (15) from expansion tank assembly (3).
Illustration 7 g00592178
Remove two valve gaskets (16) and (18), pressure valve plate (17), and pressure relief valve assembly (19) from relief valve cover (15).
Illustration 8 g00592240
Remove four bolts (20) and the washers that hold liquid level indicator (21) to expansion tank assembly (3). Remove liquid level indicator (21) and the gasket (not shown) from expansion tank assembly (3).