Replacing Oil Pan In Mitsubishi Lancer: Step-By-Step Guide

The Mitsubishi Lancer is a car that has been in production since 2002. Over time, the oil pan in this model may need to be replaced due to damage or leaks. This is a complex process that involves jacking up the car, removing the old oil pan, cleaning the engine block, applying a new gasket, and refilling the engine with oil. The oil pan bolt size and the number of bolts vary depending on the Lancer model and year. It is recommended to get an oil change when replacing the oil pan. The cost of replacing the oil pan gasket ranges from $293 to $926.83.

Detecting oil pan gasket leaks

Detecting an oil pan gasket leak in a Mitsubishi Lancer can be done by following these steps:

• Lift your vehicle using a floor jack.
• Clean the dirt and oil residue around the oil pan.
• Inspect the area around the oil pan and the engine block for signs of oil leaks. If engine oil residue, wetness, or dripping is found around the pan’s edges, a gasket replacement is needed. An ASE-certified mechanic may also use a UV light to identify other leak sources and recommend repairs.

If a leak is detected, the oil pan gasket will need to be replaced. This can be a messy job, so it is recommended to visit an auto repair shop for the job. The estimated cost for an oil pan gasket replacement is between $450 and $600, including parts and labor.

Before attempting to replace the oil pan gasket, it is important to confirm that the leak is indeed coming from the gasket. Other common areas for leaks in the Mitsubishi Lancer include the oil cooler lines, timing chain cover, turbo oil return, and the overfilled transfer case.

To replace the oil pan gasket, follow these general steps:

• Place a drain pan under the vehicle and let the old oil drain out completely.
• Remove the oil pan bolt, being careful not to damage the oil pick-up located inside the oil pan.
• Remove the motor mount, oil pan, and old gasket.
• Clean and dry the lower engine block, the oil pan, and the motor mount.
• Apply a thin film of RTV (silicone rubber) to the mounting surface.
• Position the new oil sump gasket and apply pressure.
• Use wire strands to loosely twist around the new gasket to keep it in place while you install the pan bolt.
• Torque the oil pan bolt according to the manufacturer’s specifications.
• Reinstall the oil filter, oil drain plug, and refill the crankcase with new motor oil.
• Lower the vehicle and start the engine, checking for any signs of an oil leak.

Removing the oil pan

First, you will need to lift and support the vehicle using jacks and jack stands. Place a drain pan underneath the vehicle to catch the oil, then undo the oil filter and oil drain plug to allow the oil to drain out.

The next step is to remove the oil pan bolt and the oil pan itself. This can be challenging, as the oil pan may be stuck to the engine block. You may need to use a pry bar or a specialised gasket separator tool to separate the oil pan from the engine. Be careful not to damage the oil pick-up located inside the oil pan during this process.

Once the oil pan is removed, use a clean rag to wipe away any metal debris and residue from the engine block, oil pan, and motor mount. Allow these components to dry for a few minutes.

It is important to note that the oil pan gasket should also be replaced during this process. The new gasket should be positioned against the mounting surface, and a thin film of RTV (silicone rubber) should be applied to ensure a proper seal.

Finally, refer to the manufacturer's specifications for torque settings when reinstalling the oil pan bolt. Reinstall the oil filter, oil drain plug, and refill the crankcase with new motor oil.

Always consult a qualified mechanic or a professional repair shop if you are unsure about any part of this process.

Cleaning the engine block

Engine block cleaning is a crucial step in maintaining the health and performance of your Mitsubishi Lancer's engine. Here are some detailed instructions on how to clean the engine block:

Step 1: Remove the Engine Block

Carefully remove the engine block from your Mitsubishi Lancer, placing it in an area where you can work comfortably and safely. Ensure you have a clean workspace to avoid any debris or contaminants getting into the engine.

Step 2: Initial Cleaning

Use a brush or compressed air to remove any large debris, grease, or oil from the engine block. Pay close attention to the oil galleries, as these need to be thoroughly cleaned. You can use a special oil gallery cleaning tool with a brush to ensure these areas are free of debris.

Step 3: Wash the Block

Use a cleaning solution specifically designed for engine blocks. You can choose from various options, including aqueous solutions with detergents or alkalines, chemical solvents, or ultrasonic cleaning. Ultrasonic cleaning uses high-frequency sound waves to create tiny bubbles that implode against the metal surface, effectively removing contaminants. This method is excellent for reaching hidden areas like blind holes and internal passageways.

If you opt for a chemical solvent, be aware that their use may be restricted due to environmental concerns. Aqueous solutions typically require heat (around 130 to 170 degrees F) and agitation for the best results.

Step 4: Rinse and Dry

Rinse the engine block thoroughly to remove any remaining cleaning solution. Use compressed air or a dry cloth to ensure the block is completely dry. Pay attention to the cylinder walls, as these are particularly susceptible to rusting if left wet.

Step 5: Apply Penetrating Oil

Immediately after drying, apply a light coat of penetrating oil to the cylinder walls. This step is crucial to prevent rust and corrosion.

Step 6: Final Inspection

Before reassembling the engine, inspect the engine block for any remaining debris or residue. Ensure that all oil lines, galleries, and other critical areas are free of sludge, varnish, or carbon deposits.

By following these steps, you can effectively clean the engine block of your Mitsubishi Lancer, ensuring its optimal performance and prolonging its lifespan. Remember always to refer to your owner's manual or seek professional assistance if you have any doubts or concerns during the cleaning process.

Applying RTV to the mounting surface

When replacing the oil pan in a Mitsubishi Lancer, it is important to follow the correct procedure to ensure a proper seal and avoid oil leaks. Here is a detailed, step-by-step guide for applying RTV to the mounting surface during this process:

Before applying the RTV, ensure that the mounting surface is clean and dry. Use a clean rag to wipe away any dirt, oil residue, or old RTV from the engine block, oil pan, and motor mount. It is crucial to start with a clean surface to achieve a strong bond. Allow the surfaces to dry completely before proceeding.

Once the surfaces are prepared, it's time to apply the RTV. RTV, or Room Temperature Vulcanizing rubber, is a type of silicone rubber used to create a seal between the oil pan and the engine block. Apply a thin film of RTV to the mounting surface of the engine block. Ensure that the RTV is applied evenly and that it does not get onto the outside of the bolt holes. You can use a caulking gun or a similar tool to control the bead size and ensure a neat application.

After applying the RTV, it's important to follow the manufacturer's instructions for the curing or "skin time." Some RTVs may require you to let the sealant dry for a specific period before proceeding. Refer to the instructions on the RTV packaging to determine the recommended curing time.

While waiting for the RTV to cure, prepare the new oil sump gasket. Position the gasket against the mounting surface, ensuring that the bolt holes in the gasket and the pan are properly aligned. You can use a few loose strands of wire, peeled of their insulation, to keep the gasket in place temporarily.

Finally, install the oil pan bolt and torque it according to the manufacturer's specifications. Be careful not to over-tighten or under-tighten the bolt, as this can lead to oil leaks. Refer to your Mitsubishi Lancer's repair manual or seek advice from a certified mechanic if you are unsure about the correct torque settings.

By following these steps and allowing the RTV to cure properly, you can effectively apply RTV to the mounting surface when replacing the oil pan in a Mitsubishi Lancer. Remember to work carefully and ensure that all surfaces are clean and dry before applying the RTV.

Reinstalling the oil filter and drain plug

Once the new oil pan has been installed, the next step is to reinstall the oil filter and drain plug. This is a crucial step in the process, as it will ensure that the oil system is sealed and can function properly.

First, locate the oil filter and drain plug. These are usually found near the oil pan, and may have been removed at the beginning of the oil pan replacement process. If they are still in place, you will need to remove them before continuing.

Next, take the new oil filter and drain plug, and fit them into the appropriate spaces. Make sure that they are securely fitted and tightened, as any leaks could cause a loss of oil and potential damage to the engine.

After the oil filter and drain plug have been replaced, the crankcase can be refilled with new motor oil. It is important to use the correct type and amount of oil for your vehicle, as specified in the owner's manual or by the manufacturer.

Finally, lower the vehicle and start the engine. Let it run for a few minutes, and check for any signs of oil leaks. If there are no leaks, then the oil pan, filter, and drain plug have been successfully replaced.

Frequently asked questions