2007 Infiniti G35 Water Pump Replacement
2007 Infiniti G35 Water Pump Replacement: A Comprehensive Guide
The 2007 Infiniti G35, powered by the venerable VQ35DE engine, is known for its performance and reliability. However, like all vehicles, certain components are subject to wear and tear. The water pump, a critical component of the cooling system, is one such item. A failing water pump can lead to overheating, potentially causing severe engine damage. This guide provides a detailed walkthrough of the water pump replacement process for the 2007 Infiniti G35, catering to both experienced mechanics and DIY enthusiasts.
Tools and Materials Required
Before commencing the replacement, ensure you have all the necessary tools and materials readily available. This will streamline the process and minimize downtime. The following list is comprehensive but may vary slightly based on your specific vehicle configuration or preferred techniques:
- New water pump with gasket
- Coolant (Nissan/Infiniti OEM recommended)
- Distilled water
- Socket set (metric)
- Wrench set (metric)
- Screwdrivers (Phillips and flathead)
- Pliers
- Torque wrench
- Drain pan
- Funnel
- Jack and jack stands
- Wheel chocks
- Rags or shop towels
- Safety glasses
- Gloves
- Coolant drain plug socket (often a square drive)
- Serpentine belt tool (optional, but recommended)
- Penetrating oil (e.g., PB Blaster)
- Scraper or gasket remover
Preparation and Safety Precautions
Safety is paramount when working on any vehicle. Before starting, ensure the vehicle is parked on a level surface, the parking brake is engaged, and the wheels are chocked. Allow the engine to cool down completely before beginning. Hot coolant can cause severe burns.
Disconnect the negative battery terminal to prevent electrical shorts. Raise the vehicle using a jack and secure it with jack stands. Never work under a vehicle supported only by a jack.
Step-by-Step Replacement Procedure
1. Draining the Coolant
Locate the radiator drain plug, typically situated at the bottom corner of the radiator. Position a drain pan underneath the plug. Slowly open the drain plug to allow the coolant to drain. If the drain plug is seized, apply penetrating oil and allow it to soak before attempting to loosen it. Alternatively, you can disconnect the lower radiator hose to drain the coolant, but this method can be messier. Be sure to safely dispose of used coolant according to local regulations. Coolant is toxic and should not be poured down drains or into the environment.
2. Removing the Serpentine Belt
The serpentine belt drives various engine accessories, including the water pump. Use a serpentine belt tool or a wrench to relieve tension on the belt tensioner. Carefully remove the serpentine belt, noting its routing for reinstallation. A diagram is often located under the hood. If the belt is worn or cracked, now is a good time to replace it.
3. Accessing the Water Pump
The water pump on the VQ35DE engine is typically located on the front of the engine, driven by the timing chain. Removing surrounding components may be necessary to gain access. This may include:
- Upper radiator hose
- Lower radiator hose
- Heater hoses
- Throttle body (in some cases, to improve access)
- Various brackets and wiring harnesses
Carefully disconnect these components, labeling any wires or hoses to ensure proper reassembly. Take pictures as you disassemble to serve as a visual reference.
4. Removing the Old Water Pump
With the surrounding components removed, the water pump should be visible. Remove the bolts securing the water pump to the engine block. These bolts may be tight, so use penetrating oil if necessary. Once all the bolts are removed, carefully detach the water pump. It may be stuck due to the old gasket. Use a rubber mallet or pry bar (gently!) to break the seal. Be prepared for some residual coolant to spill out.
Inspect the water pump mounting surface on the engine block for any corrosion or debris. Clean the surface thoroughly with a scraper or gasket remover, ensuring a smooth, clean surface for the new gasket.
5. Installing the New Water Pump
Install the new water pump gasket onto the water pump or the engine block, depending on the design. Ensure the gasket is properly aligned. Carefully position the new water pump onto the engine block, aligning the bolt holes. Install the water pump bolts and tighten them to the manufacturer's specified torque. Use a torque wrench to avoid over-tightening, which can damage the threads or the water pump housing. Consult a repair manual for the correct torque specifications for the 2007 Infiniti G35 VQ35DE engine.
6. Reassembly
Reinstall all the components that were removed during the disassembly process. This includes:
- Upper radiator hose
- Lower radiator hose
- Heater hoses
- Throttle body (if removed)
- Various brackets and wiring harnesses
- Serpentine belt
Ensure all connections are secure and properly tightened. Double-check your work against the pictures you took during disassembly.
7. Filling the Cooling System
Close the radiator drain plug securely. Slowly fill the cooling system with a 50/50 mixture of Nissan/Infiniti OEM coolant and distilled water. Use a funnel to avoid spills. Bleed the cooling system to remove any air pockets. Air pockets can cause overheating and damage the engine. Consult your vehicle's repair manual for the proper bleeding procedure. This usually involves running the engine with the radiator cap off (while cold) and monitoring the coolant level.
8. Testing and Inspection
Start the engine and allow it to reach operating temperature. Monitor the temperature gauge closely to ensure the engine does not overheat. Check for any leaks around the water pump, hoses, and radiator. If leaks are present, tighten the connections or replace the affected components. Allow the engine to cool completely, then recheck the coolant level and top off if necessary.
Common Issues and Troubleshooting
Overheating: If the engine overheats after replacing the water pump, suspect air pockets in the cooling system, a faulty thermostat, or a problem with the radiator. Bleed the cooling system thoroughly and check the thermostat for proper operation.
Leaks: Leaks around the water pump typically indicate a problem with the gasket or improper installation. Ensure the gasket surface is clean and the bolts are tightened to the correct torque. If the leak persists, the water pump itself may be defective.
Noise: A noisy water pump can indicate a failing bearing. If the new water pump is noisy, it may be defective and need to be replaced.
Preventative Maintenance
To prolong the life of your water pump and cooling system, consider the following preventative maintenance measures:
- Use only Nissan/Infiniti OEM coolant or a coolant specifically formulated for Asian vehicles.
- Flush the cooling system every 30,000 miles or as recommended by the manufacturer.
- Inspect the hoses and belts regularly for cracks, leaks, or wear.
- Replace the thermostat when replacing the water pump.
- Address any cooling system issues promptly to prevent further damage.
Conclusion
Replacing the water pump on a 2007 Infiniti G35 is a manageable task for experienced mechanics and DIY enthusiasts. By following these detailed instructions and taking the necessary safety precautions, you can effectively restore the cooling system to proper working order and prevent costly engine damage. Remember to consult a repair manual for specific torque specifications and procedures for your vehicle. Regular maintenance and prompt attention to cooling system issues will ensure the longevity and performance of your VQ35DE engine. Understanding the nuances of the VQ35DE engine is key to successful repairs and maintenance on the G35.