ACDelco Gold TB122 Timing Belt Instruction Manual

1. Introduction

The ACDelco Gold TB122 Timing Belt is a premium aftermarket replacement component designed to synchronize the rotation of the engine's crankshaft and camshaft(s). This synchronization ensures that the engine's valves open and close at the correct times in relation to the piston positions, which is critical for proper engine operation. This instruction manual provides essential information regarding the installation, maintenance, and specifications of your ACDelco Gold TB122 Timing Belt.

2. Safety Information

Warning: Working on automotive engines can be hazardous. Always observe the following safety precautions:

• Disconnect the vehicle's battery before beginning any work to prevent accidental starting or electrical shorts.
• Allow the engine to cool completely before working on it to avoid burns.
• Wear appropriate personal protective equipment, including safety glasses and gloves.
• Ensure the vehicle is securely supported on jack stands if raised. Never rely solely on a jack.
• Refer to your vehicle's specific service manual for detailed procedures and torque specifications.
• If you are not experienced with automotive repairs, it is highly recommended to seek professional installation by a qualified mechanic.

3. Product Overview

The ACDelco Gold TB122 Timing Belt is constructed from durable rubber and nylon materials, engineered for reliable performance. It is designed to meet the specifications for fit, form, and function for General Motors vehicles as well as most makes and models, serving as a high-quality alternative to Original Equipment (OE) parts.

Image 1: The ACDelco Gold TB122 Timing Belt, showing its ribbed design and material construction.

4. Installation

Installation of a timing belt is a complex procedure that varies significantly between vehicle models. The following steps are a general overview and should not replace your vehicle's specific service manual. Professional installation is strongly recommended.

1. Preparation: Ensure the engine is cold. Disconnect the negative battery terminal. Secure the vehicle on a level surface.
2. Access: Remove any components obstructing access to the timing belt, such as engine covers, accessory belts, pulleys, and engine mounts.
3. Engine Timing: Rotate the crankshaft to align the engine's timing marks (crankshaft and camshaft(s)) to the Top Dead Center (TDC) position for cylinder 1. This is crucial to prevent engine damage.
4. Old Belt Removal: Loosen the timing belt tensioner and carefully remove the old timing belt. Inspect all associated components (tensioners, idlers, water pump if driven by the timing belt) for wear and replace as necessary.
5. New Belt Installation: Install the new ACDelco Gold TB122 Timing Belt, ensuring that the timing marks remain perfectly aligned. Follow the vehicle manufacturer's specific routing diagram.
6. Tensioning: Adjust the timing belt tensioner according to the vehicle manufacturer's specifications. Incorrect tension can lead to premature belt failure or engine noise.
7. Verification: Manually rotate the crankshaft two full revolutions and re-check all timing marks to confirm they are still aligned.
8. Reassembly: Reinstall all removed components in reverse order. Reconnect the battery.

5. Operation

Once correctly installed, the ACDelco Gold TB122 Timing Belt operates continuously to maintain the precise synchronization between the crankshaft and camshaft(s). This ensures the engine's valves open and close at the exact moments required for optimal combustion, contributing to efficient engine performance and fuel economy.

6. Maintenance

Regular inspection and timely replacement are key to the longevity of your timing belt and the health of your engine.

• Inspection: Periodically inspect the timing belt for signs of wear, cracking, fraying, glazing, or missing teeth. Check for proper tension. Any visible damage warrants immediate replacement.
• Replacement Interval: Refer to your vehicle manufacturer's service schedule for the recommended timing belt replacement interval. This is typically based on mileage or time, whichever comes first. Adhering to this schedule is critical to prevent catastrophic engine damage from a broken timing belt.
• Associated Components: It is highly recommended to replace the timing belt tensioner, idler pulleys, and any water pump driven by the timing belt simultaneously with the timing belt itself. These components have similar lifespans and replacing them together saves labor costs and prevents future failures.

7. Troubleshooting

A failing or improperly installed timing belt can lead to serious engine problems. Be aware of the following symptoms:

• Engine Misfires or Rough Idling: Can indicate incorrect timing due to a stretched or worn belt.
• Ticking or Whining Noise from Engine: May suggest a loose or worn timing belt, or a failing tensioner/idler pulley.
• Engine Not Starting or Cranking but Not Firing: A broken timing belt will prevent the engine from running as the crankshaft and camshaft are no longer synchronized. This often results in severe internal engine damage.
• Check Engine Light: Modern vehicles may trigger a check engine light if timing issues are detected.

If you experience any of these symptoms, cease operation of the vehicle immediately and have it inspected by a qualified mechanic. Continuing to drive with a compromised timing belt can lead to irreversible engine damage.

8. Specifications

9. Warranty Information

For specific warranty details regarding your ACDelco Gold TB122 Timing Belt, please refer to the warranty documentation provided at the time of purchase or visit the official ACDelco website. Warranty terms and conditions may vary.

10. Support

If you require further assistance, have questions about installation, or need to locate an authorized service center, please visit the official ACDelco website or contact their customer support services. Always provide your product model number (TB122) and any relevant vehicle information when seeking support.