Download 1999 MITSUBISHI DIAMANTE Service and Repair Manual –

Rebuilding the transmission of a Mitsubishi Diamante is a complex task that requires a good understanding of automotive mechanics, specialized tools, and a safe working environment. click here for more details on the download manual…..

below is a detailed guide that outlines the components involved in a transmission rebuild and the steps necessary to complete the task. Please note that this guide is not exhaustive and should be used in conjunction with a service manual specific to the Mitsubishi Diamante.

### Components of the Transmission

1. **Transmission Case**: The housing that contains all the internal components of the transmission. It is typically made from aluminum or cast iron.

2. **Torque Converter**: A fluid coupling that transmits power from the engine to the transmission. It allows for smooth acceleration and can multiply engine torque.

3. **Planetary Gear Set**: A series of gears that provide different gear ratios, allowing for forward and reverse motion.

4. **Clutch Packs**: Sets of friction plates that engage and disengage to allow for shifting between gears. They are critical for the automatic transmission’s operation.

5. **Valve Body**: The control center of the transmission that directs hydraulic fluid to the appropriate clutch packs and bands based on input from the transmission control module or driver input.

6. **Hydraulic Pump**: Pressurizes the transmission fluid, enabling various components to operate correctly.

7. **Shift Linkage**: The mechanism that connects the gear shifter to the transmission, allowing the driver to select gears.

8. **Seals and Gaskets**: Used throughout the transmission to prevent fluid leaks.

9. **Fluid Filter**: Removes contaminants from the transmission fluid, ensuring proper operation and longevity of the components.

10. **Transmission Fluid**: The hydraulic fluid that lubricates and cools the transmission while providing the necessary hydraulic pressure for operation.

### Tools Required

– Socket set (metric)
– Wrenches (metric)
– Screwdrivers (flathead and Phillips)
– torque wrench
– Transmission jack
– Oil drain pan
– Pliers
– Snap ring pliers
– Clean rags
– Transmission rebuild kit (seals, gaskets, clutches, etc.)

### Step-by-Step Transmission Rebuild Procedure

#### 1. Preparation
– **Safety First**: Ensure you are working in a well-ventilated area and wear safety glasses and gloves.
– **Disconnect the Battery**: Remove the negative terminal to prevent electrical shorts.

#### 2. Remove the Transmission
– **Drain the Fluid**: Place an oil drain pan under the transmission pan and remove the drain plug. If there is no plug, remove the transmission pan bolts and let the fluid drain.
– **Disconnect Linkages**: Detach the shift linkage and any electrical connectors from the transmission.
– **Remove the torque Converter**: If applicable, unbolt the torque converter from the flex plate.
– **Unbolt the Transmission**: Remove the mounting bolts securing the transmission to the engine and any crossmembers.
– **Lower the Transmission**: Use a transmission jack to carefully lower the transmission from the vehicle.

#### 3. Disassemble the Transmission
– **Remove the Transmission Case**: Unbolt and separate the transmission case from the valve body and other internal components.
– **Inspect Components**: As you disassemble, inspect each component for wear or damage. Take notes or photos for reference during reassembly.
– **Remove the Clutch Packs and Gears**: Carefully take out the clutch packs, planetary gears, and valve body. Note the order and orientation of the components.

#### 4. Clean and Replace Components
– **Clean the Case download MITSUBISHI DIAMANTE workshop manual and Components**: Use a solvent and a brush to clean all components, especially the case. Make sure to remove old gasket material.
– **Inspect and Replace**: Replace any worn or damaged parts, including seals, gaskets, and clutches. Use a transmission rebuild kit that matches your specific model.

#### 5. Reassemble the Transmission
– **Reinstall Clutch Packs**: Place the new clutch packs in the correct order, ensuring proper alignment.
– **Reinstall planetary Gear Set**: Ensure that the gears are properly seated and lubricated.
– **Reattach the Valve Body**: Align and bolt the valve body back into position, ensuring all passages are clear.
– **Install New Seals and Gaskets**: Use new seals and gaskets to prevent leaks during operation.

#### 6. Reinstall the Transmission
– **Reattach the Transmission Case**: Carefully align and bolt the transmission case back together.
– **Lift the Transmission Back into Place**: Use the transmission jack to raise the transmission back into the vehicle.
– **Reconnect Components**: Reattach the torque converter, shift linkage, electrical connectors, and any other components you removed.

#### 7. Refilling and Testing
– **Refill with Transmission Fluid**: Use the recommended type and amount of transmission fluid for the Mitsubishi Diamante.
– **Reconnect the Battery**: Reattach the negative battery terminal.
– **Start the Engine**: Allow the engine to idle and check for leaks. Cycle through the gears while the vehicle is stationary, checking for proper engagement.
– **Test Drive**: Take the vehicle for a short test drive to ensure proper operation of the transmission.

### Conclusion
Rebuilding a transmission requires patience and attention to detail. always consult a service manual for specific torque specifications and detailed procedures. If you are unsure or inexperienced, consider seeking help from a professional mechanic. This guide serves as a general overview and may not cover all aspects of the rebuild process specific to your Mitsubishi Diamante’s model year and transmission type.
The crankshaft seal is a vital component in an internal combustion engine, playing a crucial role in maintaining engine performance and longevity. Positioned at the ends of the crankshaft, the seal serves to prevent engine oil from leaking out of the engine while also blocking contaminants from entering the crankcase. Typically made from durable materials such as rubber or silicone, crankshaft seals are designed to withstand high temperatures and pressures, adapting to the dynamic environment of the engine.

There are generally two primary crankshaft seals: the front crankshaft seal and the rear crankshaft seal. The front seal is located at the front of the engine, where the crankshaft connects to the timing belt or chain, while the rear seal is positioned at the back, where the crankshaft connects to the transmission. Both seals are essential for ensuring that the engine operates smoothly and efficiently.

Over time, crankshaft seals can wear out due to factors like heat, oil degradation, and mechanical stress. Signs of a failing crankshaft seal include oil leaks, oil spots under the vehicle, and, in some cases, engine performance issues. Regular inspection and replacement of these seals are crucial during routine maintenance to prevent costly engine damage and ensure optimal performance. Overall, the crankshaft seal is an often-overlooked yet integral component that contributes significantly to the engine’s overall health and functionality.