Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT FOR COOLANT LEAK

HINT:

• 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.

(a) Visually check the engine water pump assembly.

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

HINT:

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

(b) Remove the V-ribbed belt.

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(c) Remove the water pump pulley.

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HINT:

Move the water pump pulley so that the drain plug can be reached.

(d) Inspect the area around the engine water pump assembly.

HINT:

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

(1) Press a piece of paper towel against the drain plug and check that the paper towel is not wet and that there are no deposits on the lip of the drain plug. If the paper towel is wet, replace the engine water pump assembly. If the paper towel is not wet, thoroughly clean the area around the engine water pump assembly.

*a Drain Plug

(e) Install the water pump pulley.

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2. INSPECT ENGINE WATER PUMP ASSEMBLY

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

(b) Install the V-ribbed belt.

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