RM3660EC _51 Engine / Hybrid System _080776 NR Series COOLING _0392638 WATER PUMP G

NR Series COOLING WATER PUMP ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

HINT:

Water Pump Construction

Evaporation Port and Drain Plug:

2.406,0.563 3.302,0.771 true 3.833,1.354 4.677,1.563 4.677,1.563 3.833,1.052 true 3.583,1.698 4.563,2.104 true 2.5,2.073 3.292,1.771 true 2.198,0.5 2.51,0.698 0.313,0.198 10 false *1 4.771,1.521 5.083,1.719 0.313,0.198 10 false *2 4.625,2.063 4.969,2.323 0.344,0.26 10 false *3 2.302,2.042 2.615,2.24 0.313,0.198 10 false *4 0.135,0.073 0.448,0.271 0.313,0.198 10 false *a

*1	Evaporation Port	*2	Mechanical Seal
*3	Fluid Catch Pocket	*4	Drain Plug
*a	Typical Water Pump Assembly	-	-

Water Pump Mechanical Seal

The water pump shaft is sealed by a mechanical type seal.

Mechanical Seal Components:

5.479,1.646 5.938,1.271 true 4.813,1.885 3.875,1.271 true 4.177,1.958 3.802,1.708 true 5.823,2.229 6.031,2.469 true 5.521,2.188 5.74,2.583 true 6,1.167 6.313,1.365 0.313,0.198 10 false *1 3.698,1.188 4.01,1.385 0.313,0.198 10 false *2 3.604,1.625 3.917,1.823 0.313,0.198 10 false *3 5.99,2.5 6.302,2.698 0.313,0.198 10 false *4 5.698,2.615 6.01,2.813 0.313,0.198 10 false *5

*1	Spring: Applies pressure to the seal ring to ensure the seal ring and mating ring are in constant contact.	*2	Seal Ring: Stationary sealing member in the water pump housing, held in place by the cartridge.
*3	Mating Ring: Rotates with the water pump shaft and provides sealing surface for the seal ring.	*4	Cartridge: Locates the seal ring and bellows in the water pump housing.
*5	Bellows: Seals the cartridge and the seal ring.	-	-

Temporary Leaks

As the water pump assembly rotates, a small amount of engine coolant is discharged to cool and lubricate the sliding surface of the mechanical seal and evaporates.

Water pump replacement is not necessary

If debris becomes lodged between the mating ring and seal ring a small gap is formed. This allows coolant to bypass the mechanical seal, flow into the fluid catch pocket, and drain out of the weep hole. This condition is temporary and will no longer be present once the debris breaks up or works its way out of the seal.

Water pump replacement is not necessary

Examples (Dry Coolant Residue):

Examples (Wet Coolant Residue/Drips):

Debris in Mechanical Seal:

2.417,1.063 2.865,1.49 true 2.708,0.75 3.479,1.458 true 4.354,1.188 4.792,0.906 true 4.667,1.594 5.24,1.469 true 4.458,1.708 4.906,2.333 true 4.865,0.813 5.177,1.01 0.313,0.198 10 false *3 2.521,0.656 2.833,0.854 0.313,0.198 10 false *2 2.24,0.979 2.552,1.177 0.313,0.198 10 false *1 5.292,1.365 5.604,1.563 0.313,0.198 10 false *4 4.865,2.354 5.177,2.552 0.313,0.198 10 false *5 5.031,0.333 5.344,0.531 0.313,0.198 10 false *6 1.927,0.323 2.24,0.521 0.313,0.198 10 false *7

*1	Mating Ring	*2	Seal Ring: gap formed by debris
*3	Spring	*4	Cartridge
*5	Bellows	*6	Housing Side
*7	Impeller Side	-	-

PROCEDURE

Hide Display 1. INSPECTION METHOD

Perform a cooling system pressure check to confirm if there are leaks present from areas of the cooling system other than the water pump.

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING SYSTEM>ON-VEHICLE INSPECTION201906,999999,_51,_080776,_0392635,RM100000001HRVO_01_0001,

Are leaks preset in the cooling system other than from the water pump?

Result:

Result	Proceed to
Yes	Continue leak diagnosis per the RM and correct any other cooling system leaks first before proceeding
No	Go to Step (b)

Is the coolant level below the "low" indicator on the reservoir?

Result:

Result	Proceed to
Yes	Replace the water pump
No	Go to Step (c)

Does the water pump pulley/bearing have excessive free play or does not turn smoothly?

Result:

Result	Proceed to
Yes	Replace the water pump
No	Go to Step (d)

A paper towel should be used to determine if a leak is active or was temporary due to debris that has now cleared.

Apply a dry paper towel to the coolant deposits around the water pump. If the paper towel remains dry the leak was temporary and the water pump does not need to be replaced.

If the paper towel becomes wet the leak is active and the water pump should be replaced.

3.438,0.563 3.75,0.76 0.313,0.198 10 false *a 5.458,0.563 5.771,0.76 0.313,0.198 10 true *b

Dry Paper Towel:
DO NOT Replace Water Pump

Wet Paper Towel:
Replace Water Pump

Is the coolant residue wet on the paper towel?

Result:

Result	Proceed to
Yes	Replace the water pump
No	No active leak is present, confirm coolant level in the reservoir is correct, clean any coolant residue from the engine and surrounding areas and return the vehicle to the customer.