WATER PUMP ON-VEHICLE INSPECTION

PROCEDURE

1. Click here

   INSPECT FOR COOLANT LEAK

   Tip:
   

   • The sliding surface inside the engine water pump assembly is lubricated by engine coolant. As some engine coolant is discharged during normal operation, coolant residue (solids) may be found on the drain plug or the bottom of the engine water pump assembly. Engine coolant may leak if foreign matter enters the engine water pump assembly, however the sealing performance will recover when the foreign matter is pushed out or breaks into fine pieces.

   • Before performing this inspection, check that there is no coolant leaking from any parts other than the water pump. If there are leaks, inspect those areas.

   • Perform this inspection when the engine is cold.

   
   

   1. Visually check the engine water pump assembly.

      
      

      1. Check that engine coolant is not dripping from the engine water pump assembly.

         Tip:
         

         • If engine coolant is dripping, replace the engine water pump assembly.

         • If engine coolant is not dripping, perform the following check.

   2. Inspect the area around the water pump.

      Tip:

      Check for deposits around the drain plug of the water pump.

      
      
      1. 

         Rotate the crankshaft pulley and align the water pump pulley hole with the drain plug.

         Table 1. Text in Illustration

         *1	Water Pump Pulley
         *2	Drain Plug
         *a	Water Pump Pulley Hole

         Tip:
         

         • The drain plug is at the bottom of the water pump.

         • Use a mirror to check that the pulley hole and drain plug are aligned.

      2. 

         Wrap a paper towel around an L-shaped tool such as a hexagon wrench, and insert it into the water pump pulley hole.

         Table 2. Text in Illustration

         *1	Thin Paper Towel

         Tip:
         

         • Use a 3 mm (0.118 in.) hexagon wrench.

         • The diameter of the water pump pulley hole is 6 mm (0.236 in.).

         • The distance from the water pump pulley hole to the drain plug is 18 mm (0.709 in.).

      3. 

         Move the hexagon wrench as shown in the illustration, and press the thin paper towel against the coolant (solid matter) adhering to the drain plug or the edge of the drain plug, and check the condition of the thin paper towel.

         Table 3. Text in Illustration

         *1	Hexagon Wrench

         Tip:
         

         • If the thin paper towel is wet, replace the water pump assembly.

         • If the thin paper towel is dry, clean the area around the water pump.

2. Click here

   INSPECT WATER PUMP ASSEMBLY

   
   

   1. Remove the fan and generator V belt (Click here).

   2. 

      Turn the pulley and check that the water pump bearing moves smoothly and quietly.

      If necessary, replace the water pump assembly.

   3. Install the fan and generator V belt (Click here).