16100-69405 WATER PUMP Fits 1610069405 TOYOTA GRANVIA GRAND HIACE HILUX SURF T100 5VZ-FE V6

Product Description

Product Function Description

The water pump is a critical component of your Toyota engine‘s cooling system. Its primary function is to circulate coolant through the engine block, cylinder head, and radiator, dissipating the intense heat generated by the combustion process. For the 3.4L 5VZ-FE V6 engine found in Toyota Granvia, Grand Hiace, Hilux Surf, T100,  and Tacoma models, the water pump is driven by the timing belt and sits behind the front covers. A properly functioning pump is essential for maintaining optimal engine temperature, preventing overheating, and protecting engine components from thermal damage. This component is designed to factory specifications, ensuring proper fit and reliable cooling system operation.

How to Diagnose a Faulty Water Pump

Before purchasing a replacement, perform these simple checks to confirm the water pump is the issue:

• Visual Inspection: Look for coolant stains or crusty residue around the water pump mounting area, especially near the weep hole on the underside of the pump housing. Check for play in the pulley.

• Physical Test: With the engine off and cool, remove the drive belt and spin the water pump pulley by hand. Feel for roughness, play, or wobble. A smooth rotation indicates good bearing condition.

• Road Test: Monitor the temperature gauge while driving. If the engine runs hotter than normal, especially under load or at low speed, this indicates insufficient coolant circulation.

• Coolant Level Check: If the coolant level keeps dropping with no obvious hose leaks, the pump is a prime suspect.

Product Specifications

Why Choose This Water Pump?

Restores Cooling System Function – A failing water pump causes overheating and engine damage. This pump restores proper coolant flow, keeping your engine at optimal operating temperature for reliable performance.

Prevents Costly Engine Damage – Overheating from a failed water pump can cause warped cylinder heads, blown head gaskets, and severe engine damage. Replacing a failing pump early is cost-effective protection.

Direct Replacement – Precision-engineered to match the original water pump specifications. Direct bolt-on replacement – no modifications required.

Proven Compatibility – This pump is confirmed compatible with Toyota Granvia, Grand Hiace, Hilux Surf, T100, Tacoma, and Tundra models equipped with the 3.4L 5VZ-FE V6 engine. 

Quality Construction – Manufactured with cast aluminium housing and quality bearings to withstand demanding operating conditions and provide long service life.

Installation Tips & Common Mistakes

The Mistake When Replacing a 5VZ-FE Water Pump:

❌ Wrong: Replacing the water pump without checking or replacing the timing belt.

✅ Correct:

1. Always replace the timing belt at the same time – On the 5VZ-FE engine, the water pump is driven by the timing belt. The scheduled service interval for 5VZ-FE is typically around 150,000 km .

2. Always use a new gasket – Reusing an old gasket is the most common cause of leaks.

3. Use the correct coolant – Toyota red Long Life Coolant at 50/50 with demineralised water is recommended .

4. Bleed the system properly – Air pockets can cause hot spots and overheating .

5. Check the timing belt tensioner – While the timing belt is off, inspect the tensioner and idler pulleys.

⚠️ Remember: The 5VZ-FE water pump is behind the timing cover, so a failed pump means removing the timing belt again. Doing both jobs at once saves time and money.

Industry Knowledge

Toyota 5VZ-FE 3.4L V6 Engine & Its Water Pump:

The 5VZ-FE is a 3.4L V6 engine used extensively in Toyota's truck and SUV lineup, including the Hilux Surf, 4Runner, Tacoma, T100, Tundra, as well as passenger vans like the Granvia and Grand Hiace . It is a DOHC naturally aspirated engine with VVT-i on later versions, known for its durability and reliability.

Engine Specifications:

• Displacement: 3.4L (3378 cc)

• Configuration: V6, DOHC, naturally aspirated

Key Fitment Note:

• The 5VZ-FE engine uses a timing belt (not a chain) to drive the camshafts and the water pump 

• The water pump and timing belt share the same drive system, making it economical to replace them together

• Scheduled service interval for timing belt on 5VZ-FE is typically around 150,000 km 

Why This Pump is Different:

• The water pump is located behind the timing cover

• The pump is driven by the timing belt, not the accessory belt

• Replacement requires removal of the timing belt

Package Contents

• 1 × Water Pump Assembly

• Protective packaging with part number label

Note: The water pump gasket may or may not be included. Confirm with your specific seller. The timing belt is not included.

After Replacement Still Having Issues?

Replaced the water pump but still having cooling issues? Check these :

1. Was the timing belt replaced? – If the timing belt was old, it may have affected pump operation or timing

2. Is there air in the cooling system? – Bleed the system properly with the heater set to hot 

3. Is the thermostat working? – A stuck thermostat can cause overheating regardless of the water pump 

4. Is the radiator blocked? – Debris or scale in the radiator can restrict coolant flow

5. Are the hoses in good condition? – Collapsed or cracked hoses can restrict flow

6. Is the coolant mixture correct? – 50/50 coolant to demineralised water is essential 

7. Could it be a head gasket issue? – Internal head gasket leaks can cause overheating without oil/coolant mixing 

Quality Assurance & Service Commitment

Quality Assurance:
Every component is manufactured under controlled production processes to ensure consistent dimensional accuracy and material integrity. Each unit undergoes the following quality checks before packaging:

• Dimensional inspection – critical mounting points are verified against design specifications

• Bearing rotation test – smooth operation is confirmed

• Seal integrity check – sealing surfaces are inspected for proper fit

• Surface finish inspection – corrosion protection and surface quality are visually verified

Packaging Protection:
Each water pump is individually sealed in protective packaging to prevent contamination and physical damage during storage and transit. The packaging includes a clear part number label for easy identification.

Service Commitment:

 Related Product Recommendations

When replacing the water pump on the 5VZ-FE engine, it is strongly recommended to inspect and replace the following related components at the same time .

Recommended Related Parts:

Timing Belt Kit – The water pump is driven by the timing belt. Replace both at the same time to save labor and prevent future failure. The scheduled interval for 5VZ-FE is typically around 150,000 km .

Timing Belt Tensioner – The tensioner maintains proper belt tension. Replace during timing belt service .

Thermostat – Regulates coolant flow between the engine and radiator. Original opening temperature is 82°C. A stuck thermostat can cause overheating. Replace at the same time as the water pump for optimal cooling system performance.

Coolant Temperature Sensor – Sends engine temperature data to the ECU. A faulty sensor can cause cooling fan issues, rough idle, or hard starting. Inspect or consider replacing while the cooling system is drained.

Crankshaft Front Seal – Located behind the timing belt cover. A common leak point that can contaminate the timing belt. Inspect and replace when the timing belt is removed.