Safety First:
* Work on a level surface: This ensures accurate fluid level measurements.
* Wear safety glasses: Transmission fluid can splash.
* Use jack stands: Never work under a vehicle supported only by a jack.
* Let the transmission cool: Hot fluid can cause serious burns.
Tools and Materials:
* New transmission fluid: Use the correct type and amount specified in your owner's manual (usually GL-4 or GL-5 gear oil). The exact quantity needed will vary.
* Drain pan: Large enough to hold the old fluid.
* Socket wrench set: You'll need sockets to remove the drain plug and the fill plug (sizes will vary). A box end wrench might be helpful for stubborn plugs.
* Torque wrench: Crucial for tightening the drain and fill plugs to the correct specification; over-tightening can damage the threads.
* Funnel: To avoid spills during refilling.
* Pump (optional but recommended): A fluid pump makes filling the transmission much easier. A hand pump or a small power pump are good choices. Trying to pour fluid directly from a container is difficult and messy.
* Rags or shop towels: For cleaning up spills.
* Gloves: Protect your hands from the old transmission fluid.
* Jack and jack stands: As mentioned above.
Procedure (General Steps – Consult your manual for specific locations and details):
1. Locate the drain plug and fill plug: These are typically on the bottom and side of the transmission case, respectively. Your repair manual will show their exact locations.
2. Warm up the transmission: Run the engine for 10-15 minutes to warm the fluid, making it flow more easily. Don't overheat it.
3. Secure the vehicle: Use jack stands to safely lift and support the Rodeo.
4. Position the drain pan: Place it under the drain plug.
5. Remove the drain plug: Carefully remove the drain plug using the appropriate socket. The old fluid will drain out; be patient.
6. Replace the drain plug: Once the fluid stops dripping, replace and tighten the drain plug to the correct torque specification (found in your manual).
7. Locate the fill plug: This is usually on the side of the transmission case.
8. Remove the fill plug: This allows you to check the fluid level.
9. Refill the transmission: Use your funnel and pump to add new transmission fluid through the fill hole. The repair manual will provide the correct amount. It is extremely important to get this right, as overfilling can damage the transmission.
10. Check the fluid level: Once you've added the fluid, check the level by using the fill plug. You should be able to get a finger into the hole (with the engine running briefly) and barely touch the fluid level or see the level almost up to the opening. The exact method for checking fluid level is usually described in the repair manual.
11. Replace the fill plug: Tighten the fill plug to the specified torque.
12. Lower the vehicle: Carefully lower the vehicle using your jack.
13. Check for leaks: Inspect the area around the drain and fill plugs for any leaks.
Important Considerations:
* Partial vs. Full Flush: A partial change is easier but less effective at removing all the old fluid. A full flush requires specialized equipment and may be best left to a professional.
* Fluid Type: Using the wrong type of transmission fluid can severely damage your transmission. Always use the type specified in your owner's manual.
Disclaimer: This information is for general guidance only. Always consult your 1992 Isuzu Rodeo repair manual for detailed instructions, torque specifications, and safety precautions specific to your vehicle. Incorrect procedures can result in damage to your transmission or personal injury. If you are unsure about any part of this process, it's best to consult a qualified mechanic.
