Toyota Tundra Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT FOR COOLANT LEAK

HINT:

• The sliding surface inside the 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 water pump assembly. Engine coolant may leak if foreign matter enters the 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.

(a) Visually check the water pump assembly.

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

HINT:

• If engine coolant is dripping, replace the water pump assembly.
• If engine coolant is not dripping, perform the following check.

(b) Inspect the area around the water pump assembly.

HINT:

Check for deposits around the drain hole of the water pump assembly.

(1) Press the thin paper towel against the coolant (solid matter) adhering to the drain hole or the edge of the drain hole, and check the condition of the thin paper towel. HINT: If the thin paper towel is wet, replace the water pump assembly. If the thin paper towel is dry, thoroughly clean the area around the water pump assembly.

2. INSPECT WATER PUMP ASSEMBLY

(a) Remove the fan and generator V belt (See page ).

(b) Turn the pulley and check that the water pump bearing moves smoothly and quietly. If necessary, replace the water pump assembly.

(c) Install the fan and generator V belt (See page ).