Download Chevrolet Lanos 1999 Factory Service Repair Manual –

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You’ve come to the right place if you’re looking for a detailed explanation of how to repair the automatic transmission on a Chevrolet Lanos. Now, this is quite an intricate process, so I’ll take my time to ensure you understand every step and the tools involved along the way. Let’s dive right in!

### Understanding the Automatic Transmission

First, let’s get a grasp of what we’re dealing with. The automatic transmission in a Chevrolet Lanos is a complex hydraulic system that enables the vehicle to change gears automatically, without the need for a clutch pedal. It consists of various components like the torque converter, valve body, clutches, and bands, all of which work together to provide smooth gear transitions.

### Tools Required

Before we start, let’s list the tools you’ll need:

1. **Socket Set**: A complete metric socket set, usually ranging from 8mm to 19mm, is essential for removing bolts and nuts.
2. **Torque Wrench**: This tool helps you tighten bolts to the manufacturer’s specified torque settings, ensuring everything is fastened correctly.
3. **Screwdrivers**: A set of flathead and Phillips screwdrivers will be necessary for various fasteners.
4. **Pliers**: Needle-nose and regular pliers will be helpful for gripping and twisting.
5. **Transmission Jack**: This special jack is designed for safely supporting and maneuvering the transmission when it’s removed from the vehicle.
6. **Fluid Pump**: If you need to add or remove transmission fluid, a fluid pump will simplify the process.
7. **Gasket Scraper**: This tool is crucial for removing old gasket material from the transmission housing.
8. **Oil Catch Pan**: To catch any transmission fluid that may spill during the repair process.
9. **Cleaning Solvent**: For cleaning the internal components of the transmission.
10. **Replacement Parts**: Depending on the issue, you may need new gaskets, seals, filters, or even internal components like clutches or bands.

### Step-By-Step Process

#### Step 1: Preparation

Start by ensuring you have a clean, well-lit workspace. Gather all your tools and replacement parts. Make sure you have safety glasses and gloves on to protect yourself from any sharp edges and fluids.

#### Step 2: Disconnect the Battery

For safety, disconnect the negative terminal of the battery. This prevents any electrical shorts while you’re working on the transmission.

#### Step 3: Lift the Vehicle

Using a hydraulic floor jack, lift the front of the Chevrolet Lanos and secure it on jack stands. Always ensure that the vehicle is stable before working underneath it.

#### Step 4: Remove the Transmission Pan

Now, place the oil catch pan underneath the transmission pan to catch any fluid that may spill. Use your socket set to remove the bolts securing the transmission pan. Once all bolts are removed, gently pry the pan loose with a gasket scraper. Be careful, as the pan may still have some fluid inside.

#### Step 5: Drain the Fluid

Allow the old transmission fluid to drain completely into the catch pan. After draining, you can inspect the fluid for any metallic particles that could indicate internal damage.

#### Step 6: Inspect the Filter

Once the pan is removed, you’ll see the transmission filter. This filter should be inspected and replaced if it’s clogged or damaged. Remove the filter by pulling it straight off its mounting points.

#### Step 7: Examine the Internal Components

At this stage, you can visually inspect the internal components of the transmission, such as the clutches and bands. Look for any signs of wear, such as discoloration or burning.

#### Step 8: Replace Worn Components

If any components are worn out, you’ll need to replace them. This could involve removing the valve body, which can be done by unscrewing the bolts holding it in place. Be mindful of the small springs download Chevrolet Lanos workshop manual and check balls that may fall out when you remove it.

#### Step 9: Clean the Gasket Surface

Using the gasket scraper and cleaning solvent, thoroughly clean the mating surfaces of the transmission pan and the transmission housing. This ensures a proper seal when you reassemble everything.

#### Step 10: Reassemble the Transmission

Now it’s time to reassemble everything. Start by installing the new filter, ensuring it fits snugly. Next, replace the valve body if you removed it, making sure to replace any seals or gaskets. Tighten all bolts to the manufacturer’s specified torque using your torque wrench.

#### Step 11: Reinstall the Pan

Once everything is in place, reinstall the transmission pan with a new gasket. Tighten the bolts in a crisscross pattern to ensure even pressure across the pan.

#### Step 12: Refill Transmission Fluid

Using the fluid pump, refill the transmission with the appropriate type and amount of fluid specified for the Chevrolet Lanos. It’s essential to use the correct fluid to ensure proper operation.

#### Step 13: Reconnect the Battery and Test

Reconnect the negative terminal of the battery. Start the engine and let it idle for a few minutes. Shift through all the gears to circulate the fluid and ensure everything is working correctly. Check for any leaks underneath the vehicle.

### Conclusion

And there you have it! That’s a detailed step-by-step guide on how to repair the automatic transmission on a Chevrolet Lanos. Remember, working on transmissions can be complex, and if you’re unsure at any step, it’s always best to consult a professional mechanic. Safety first, and happy wrenching!
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