Tools You'll Likely Need:
* Socket wrench set: You'll need sockets of various sizes, likely including a 13mm, 15mm, and possibly others.
* Ratchet: A good quality ratchet will make the job easier.
* Extension(s): To reach the starter bolts in tight spaces.
* Wrench (possibly): Depending on the bolt access, you may need a wrench as well.
* Jack and jack stands (recommended): For safety and easier access. Support the vehicle properly!
* Gloves: To protect your hands.
* Safety glasses: To protect your eyes from flying debris.
* Wire brush (optional): To clean the battery terminals and starter connections.
* Penetrating oil (like PB Blaster): To help loosen stubborn bolts.
Procedure:
1. Disconnect the Battery: This is crucial to prevent accidental short circuits. Disconnect the negative (-) terminal first, then the positive (+) terminal.
2. Safety First: Secure the vehicle using jack stands after raising it with a jack. Never work under a vehicle supported only by a jack.
3. Locate the Starter: The starter is usually located on the engine block, near the transmission bellhousing. Its position varies slightly by engine type. Consult a repair manual or online diagrams specific to your engine for precise location.
4. Remove the Starter Wiring:
* Positive Cable: There's usually a large positive cable connected to the starter. Loosen the bolt holding it on and disconnect it.
* Small Wire: There's also usually a smaller wire connected to the starter solenoid. This often has a smaller nut or bolt holding it in place. Disconnect it.
5. Remove the Starter Bolts: Typically, there are two bolts holding the starter to the engine block. Use your sockets and ratchet to remove these bolts. Penetrating oil might help if they're stubborn.
6. Remove the Starter: Once the bolts are removed, the starter should be relatively free. Gently wiggle and pull the starter out. It might be a little snug due to its position, so take your time.
7. Clean the Mounting Surface: Clean any corrosion or debris from the starter mounting area on the engine block before installing the new starter.
8. Install New Starter (Reverse of Removal): Follow the above steps in reverse order to install the new starter. Ensure the wires are securely connected and the bolts are tightened to the manufacturer's specifications.
9. Reconnect the Battery: Reconnect the positive (+) terminal first, then the negative (-) terminal.
10. Test the Starter: Try starting the vehicle to verify the starter is working correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 1990 S-10 and engine type is highly recommended. It will provide detailed diagrams and torque specifications for the bolts.
* Variations: The exact process might differ slightly based on the specific engine in your truck. Pictures and diagrams are extremely helpful here.
* Stubborn Bolts: If you encounter extremely stubborn bolts, don't force them. Apply penetrating oil, let it sit, and try again. Stripping a bolt will significantly complicate the repair.
If you are uncomfortable performing this repair yourself, it's best to take your truck to a qualified mechanic. Working on your vehicle involves risks, and safety should always be your top priority.
