Pittsburgh Automotive torque wrenches are a popular choice for both professional mechanics and DIY enthusiasts due to their balance of quality and affordability. However, using a torque wrench incorrectly can lead to stripped bolts, damaged parts, and even injury. This guide will walk you through the proper steps to use a Pittsburgh torque wrench effectively and safely.
Understanding Torque and its Importance
Before diving into the specifics of using your Pittsburgh torque wrench, it's crucial to understand what torque is and why it matters. Torque is the rotational force applied to a fastener (like a bolt or nut). Applying the correct torque ensures the fastener is tightened sufficiently to maintain its integrity without being over-tightened, which can cause damage. Over-tightening can strip threads, break bolts, or even warp components. Under-tightening, conversely, can lead to loose parts and potential failure.
Types of Pittsburgh Torque Wrenches
Pittsburgh offers several types of torque wrenches, each with its own mechanism and operation:
1. Beam-Type Torque Wrenches
These are the simplest and most affordable type. They feature a calibrated beam that bends when the set torque is reached. While less precise than other types, they're excellent for infrequent use and basic applications. Always visually check the beam for deflection; do not rely on sound.
2. Click-Type Torque Wrenches
These are the most common type and offer greater accuracy than beam-type wrenches. They feature a mechanism that produces an audible "click" when the pre-set torque is reached. This provides a clear and precise indication of when to stop tightening.
3. Electronic Torque Wrenches
These are the most advanced and accurate type, often featuring digital displays to show the applied torque in real-time. They provide excellent precision and are ideal for demanding applications requiring very precise torque control. Electronic wrenches often have additional features like peak torque hold and various measurement units (Nm, ft-lb, in-lb).
Step-by-Step Guide to Using a Pittsburgh Torque Wrench (Click-Type Example)
This guide focuses on using a click-type torque wrench, the most prevalent type. Adaptations for beam-type or electronic wrenches will be noted.
1. Setting the Torque Value:
- Consult your vehicle's repair manual or the manufacturer's specifications for the correct torque setting for the specific bolt or nut you are working on. This information is crucial to avoid damage.
- Use the adjustment mechanism on your Pittsburgh torque wrench (usually a dial or ring) to set the desired torque value. Ensure the wrench is set correctly before beginning.
2. Attaching the Socket:
- Ensure the correct socket size is used for the bolt or nut. Using the wrong size can damage both the socket and the fastener.
- Securely attach the socket to the square drive of the torque wrench.
3. Applying Torque:
- Position the wrench on the fastener and apply steady, even pressure.
- Avoid jerky movements or sudden force. Consistent, smooth tightening is key.
- Listen carefully for the distinct "click" that indicates the pre-set torque has been reached. Stop tightening immediately upon hearing the click. For beam-type, watch for the deflection. Electronic models will display the torque value.
4. Releasing the Fastener:
- Once the click is heard (or the beam deflects, or the electronic display shows the value), carefully release the pressure on the wrench and remove it from the fastener.
5. Re-checking Torque (Optional):
- For critical applications, it's often recommended to re-check the torque value using a different torque wrench or a separate measuring tool to confirm the accuracy.
Maintaining Your Pittsburgh Torque Wrench
Proper maintenance is key to ensuring the accuracy and longevity of your torque wrench.
- Regular Calibration: Torque wrenches should be calibrated regularly (at least annually) to ensure accuracy. Many tool shops offer calibration services.
- Cleanliness: Keep your torque wrench clean and free of debris.
- Proper Storage: Store your torque wrench in a safe, dry place, away from extreme temperatures and impacts. Avoid dropping it or subjecting it to harsh conditions.
By following these guidelines, you can confidently use your Pittsburgh torque wrench to ensure your projects are completed correctly and safely. Remember, always consult your vehicle's repair manual or the manufacturer's specifications for accurate torque settings. Using the wrong torque can lead to costly repairs or even safety hazards.
