Download 1990 Nissan Maxima Service & Repair Manual –

Changing the gearbox (transmission) oil on a Nissan Maxima is an important maintenance task that helps ensure the smooth operation of the vehicle’s transmission system. click here for more details on the download manual…..

Here is a detailed guide on how to perform a gearbox oil change, including the necessary components and steps involved.

### Tools and Materials Needed:
1. **Tools:**
– Socket set (including a ratchet and extension)
– Wrench set
– Screwdrivers (flathead and Phillips)
– Pliers
– Torque wrench
– Funnel
– Oil drain pan
– Safety glasses
– Gloves

2. **Materials:**
– New transmission fluid (check the owner’s manual for the correct type, typically Nissan Matic S or similar)
– New transmission filter (if applicable)
– Gasket or sealant (if needed)
– Rags or paper towels

### Step-by-Step Guide:

#### 1. Preparation:
– **Park the Vehicle:** Ensure the vehicle is parked on a flat surface, and engage the parking brake.
– **Gather Materials:** Collect all tools and materials needed for the job.
– **Safety Gear:** wear safety glasses and gloves to protect yourself from any spills or debris.

#### 2. Locate the Transmission:
– **Identify the Transmission:** The transmission is typically located underneath the vehicle, just behind the engine. It may be covered by a protective plate that may need to be removed.

#### 3. Drain the Old Fluid:
– **Position the Drain Pan:** Place the oil drain pan underneath the transmission pan to catch the old fluid.
– **Remove the Drain Plug:** Use a socket wrench to remove the drain plug if equipped. Allow the old transmission fluid to completely drain into the pan.
– **Inspect the Fluid:** Check the condition of the old fluid. If it appears burnt or has a strong odor, it may indicate a problem.

#### 4. Remove the Transmission Pan (if applicable):
– **Remove Bolts:** If your Maxima has a removable transmission pan, use a socket wrench to remove the bolts securing the pan.
– **Gently Pry Off the Pan:** Use a flathead screwdriver to gently pry the pan loose. Be careful not to damage the mating surface.
– **Clean the Pan:** Clean the inside of the transmission pan with rags and let it dry. If it has a filter, replace it as needed.

#### 5. Replace the Transmission Filter (if applicable):
– **Remove the Old Filter:** If your model has a filter, remove the old filter. It may be secured with screws or clips.
– **Install the New Filter:** Install the new filter, ensuring it is seated properly and secured.

#### 6. Clean the Gasket Surface:
– **Remove Old Gasket Material:** If there is a gasket, scrape off the old gasket material from the transmission pan and the transmission housing.
– **Prepare the Surface:** Clean the surfaces thoroughly to ensure a good seal with the new gasket.

#### 7. Install the New Gasket:
– **Position the New Gasket:** If you are using a new gasket, position it onto the transmission pan.
– **Apply Sealant (if needed):** If your model requires sealant instead of a gasket, apply it according to the manufacturer’s instructions.

#### 8. Reattach the Transmission Pan:
– **Align the Pan:** Carefully align the transmission pan with the bolt holes and press it into place.
– **Secure with Bolts:** Hand-tighten the bolts initially, then use a torque wrench to tighten them to the manufacturer’s specified torque settings (usually found in the service manual).

#### 9. Refill with New Transmission Fluid:
– **Locate the Fill Plug:** Find the transmission fluid fill plug, typically located on the side or top of the transmission.
– **Remove the Fill Plug:** Use a socket or wrench to remove the fill plug.
– **Add New Fluid:** Use a funnel to pour the new transmission fluid into the fill hole. Add fluid slowly download Nissan Maxima workshop manual and check the level using the dipstick (if applicable) or by checking the fill hole level.

#### 10. Check for Leaks:
– **Start the Engine:** Start the vehicle and let it run for a few minutes. shift through all gears to circulate the fluid.
– **Check Fluid Level:** Stop the engine, wait a few moments, then check the fluid level again, adding more fluid if necessary.
– **Inspect for Leaks:** Inspect the area around the transmission pan and drain plug for any signs of leaks.

#### 11. Clean Up:
– **Dispose of Old Fluid:** Properly dispose of the old transmission fluid at a recycling center or automotive store.
– **Tools and Materials:** Clean your tools and the work area.

### Conclusion:
Regularly changing the gearbox oil in your Nissan Maxima helps maintain the health of the transmission, promoting longevity and performance. Always refer to your vehicle’s owner’s manual for specific instructions and specifications related to your model year. If you’re uncomfortable performing this task, consider seeking assistance from a professional mechanic.
The coolant reservoir, also known as the overflow tank or expansion tank, is a crucial component of a vehicle’s cooling system. Its primary function is to hold excess coolant, a mixture of water and antifreeze, that circulates through the engine to regulate temperature and prevent overheating. The coolant absorbs heat from the engine and dissipates it through the radiator, and during this process, the coolant expands. The coolant reservoir provides a safe space for this excess fluid to flow into as the engine heats up.

Typically made of plastic, the coolant reservoir is located near the engine bay and is marked with minimum and maximum fill lines. This allows vehicle owners or mechanics to easily check the coolant level. When the engine cools down, the coolant contracts and is drawn back into the engine, maintaining an optimal coolant level within the system.

A properly functioning coolant reservoir is vital for the overall health of the engine. If the reservoir is cracked or damaged, it can lead to coolant leaks, resulting in low coolant levels and potential overheating. Moreover, if the reservoir becomes contaminated, it can affect the performance of the cooling system. Regular inspection and maintenance of the coolant reservoir are essential to ensure the longevity and efficiency of a vehicle’s engine.

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