WATER PUMP ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT FOR COOLANT LEAK

   Engine water pump assemblies with inspection window type pulleys (w/ Inspection Window Water Pump Pulley) can be inspected for engine coolant leaks while on the vehicle.

   

   *A	w/o Inspection Window	*B	w/ Inspection Window
   *1	Water Pump Pulley	*2	Inspection Window

   Tip:

   • The sliding surface inside the engine water pump assembly is lubricated by engine coolant. As some engine coolant is discharged during normal operation, engine coolant residue (solids) may be found on the drain plug or the bottom of the engine water pump assembly. Also, 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. In this case, check the area around the engine water pump assembly.

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

   • 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. Remove the V-ribbed belt.

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   3. Inspect the area around the engine water pump assembly.

      Tip:

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

      1. 

         *a	Water Pump Pulley
         *b	Drain Plug
         *c	Inspection Window

         Rotate the water pump pulley and align the inspection window with the drain plug.

         Tip:

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

         • Use a mirror to check that the inspection window and drain plug are aligned.

      2. 

         *a	Paper Towel
         *b	Hexagon Wrench

         Wrap a thin paper towel around an L-shaped tool such as a hexagon wrench, and insert it into the inspection window.

         Tip:

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

         • The diameter of the inspection window is 12 mm (0.472 in.).

         • The distance from the inspection window to the drain plug is 13 mm (0.512 in.).

      3. 

         *a	Paper Towel
         *b	Hexagon Wrench

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

         Tip:

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

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

2. INSPECT ENGINE WATER PUMP ASSEMBLY

   1. 

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

      If necessary, replace the engine water pump assembly.

   2. Install the V-ribbed belt.

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