The Ultimate Guide to How to Change Glow Plugs TD42: Tips and Tricks You Need to Know

Are you experiencing cold starting issues with your Nissan Patrol TD42? If your engine struggles to turn over, coughs, and sputters before finally starting, the culprit could be faulty glow plugs. This blog post will guide you through the process of how to change glow plugs TD42, providing a comprehensive step-by-step guide to tackle this common maintenance task.

Understanding Glow Plugs and Their Importance

Glow plugs are essential components in diesel engines, particularly in cold climates. They act as small electric heaters that preheat the combustion chamber before starting. This preheating process ensures efficient fuel ignition, enabling a smooth and quick start, even in freezing temperatures.

Recognizing the Symptoms of Faulty Glow Plugs

Several signs indicate that your TD42 glow plugs might be failing:

• Difficulty Starting in Cold Weather: The engine struggles to turn over, coughs, and sputters before starting.
• Increased Starting Time: It takes longer than usual for the engine to start, even in moderate temperatures.
• Rough Idle: The engine idles roughly, especially after a cold start.
• White Smoke: White smoke may be emitted from the exhaust during cold starts.
• Glow Plug Light Stays On: The glow plug light on the dashboard remains illuminated for an extended period.

Gathering the Necessary Tools and Materials

Before embarking on the glow plug replacement, ensure you have the following tools and materials:

• New Glow Plugs: Purchase genuine Nissan glow plugs or a reputable aftermarket alternative.
• Socket Wrench Set: A set with a 10mm socket is required to remove and install the glow plugs.
• Torque Wrench: A torque wrench is crucial for tightening the glow plugs to the correct specifications.
• Breaker Bar: A breaker bar can provide extra leverage for removing stubborn glow plugs.
• Penetrating Fluid: Applying penetrating fluid to the glow plugs beforehand helps loosen them.
• Gloves: Protect your hands from heat and potential burns.
• Safety Glasses: Wear safety glasses to protect your eyes from debris and potential splashes.
• Clean Rags: Keep your workspace clean and wipe away any spills or leaks.

The Step-by-Step Guide to Replacing Glow Plugs on Your TD42

Now, let’s dive into the step-by-step process of replacing the glow plugs on your TD42:

1. Prepare Your Vehicle:

• Park your vehicle on a level surface and engage the parking brake.
• Disconnect the negative terminal of the battery to prevent electrical shocks.

2. Access the Glow Plugs:

• Locate the glow plugs on the top of the engine, near the cylinder head. They are usually arranged in a row, and each glow plug has a wire connected to it.
• Remove the air intake hose and any other components that obstruct access to the glow plugs.

3. Loosen the Glow Plugs:

• Spray penetrating fluid onto each glow plug to help loosen them.
• Use a 10mm socket wrench to loosen the glow plugs. Be careful not to strip the threads.
• If a glow plug is particularly stubborn, use a breaker bar for extra leverage.

4. Remove the Old Glow Plugs:

• Once the glow plugs are loosened, carefully remove them by hand.
• Inspect the old glow plugs for signs of damage or wear.

5. Install the New Glow Plugs:

• Apply a thin layer of anti-seize compound to the threads of the new glow plugs. This prevents them from seizing in the future.
• Thread the new glow plugs into the cylinder head by hand, ensuring they are seated properly.
• Use the torque wrench to tighten the glow plugs to the specified torque. Check your vehicle’s manual for the correct torque value.

6. Reconnect and Test:

• Reconnect the wires to the new glow plugs.
• Reinstall the air intake hose and any other components that were removed.
• Reconnect the negative battery terminal.
• Start the engine and check for any leaks or problems.

7. Final Checks:

• Let the engine run for a few minutes to ensure it is functioning properly.
• Check the glow plug light on the dashboard to make sure it turns off after a short period.
• Monitor the engine for any unusual noises or symptoms.

Tips for Success and Avoiding Common Mistakes

• Use the Correct Torque: Over-tightening the glow plugs can damage the threads. Always use a torque wrench and refer to the vehicle’s manual for the correct torque value.
• Clean the Threads: Before installing the new glow plugs, ensure the threads in the cylinder head are clean and free of debris.
• Avoid Stripping the Threads: Be careful not to strip the glow plug threads when loosening or tightening them.
• Inspect the Glow Plugs: Regularly inspect the glow plugs for signs of wear or damage.

A New Lease on Life for Your TD42

By following this guide, you can confidently replace the glow plugs on your TD42 and enjoy reliable cold starts once again. Remember to use the correct tools and follow the steps carefully, and you’ll be back on the road in no time.

Answers to Your Questions

Q1: How often should I replace the glow plugs on my TD42?

A: Glow plugs typically last between 50,000 and 100,000 miles. However, it’s good practice to inspect them every 50,000 miles or when you notice any signs of failure.

Q2: Can I use aftermarket glow plugs on my TD42?

A: While genuine Nissan glow plugs are always recommended, reputable aftermarket brands offer quality alternatives. However, ensure the aftermarket glow plugs are specifically designed for your TD42 engine.

Q3: What should I do if a glow plug breaks while removing it?

A: If a glow plug breaks, it’s best to consult a qualified mechanic. They have specialized tools and techniques for removing broken glow plugs without damaging the cylinder head.

Q4: Can I replace only one or two glow plugs?

A: It’s generally recommended to replace all glow plugs simultaneously. If one is failing, the others are likely nearing the end of their lifespan. Replacing them all ensures consistent performance and prevents future issues.