1. Introduction
Thank you for choosing the ACT MB012 Performance Organic Street Style Clutch Disc. This manual provides essential information regarding the proper handling, installation considerations, operational characteristics, and maintenance of your new clutch disc. Designed for enhanced performance and durability in street applications, this product is engineered to deliver reliable power transfer and smooth engagement. Please read this manual thoroughly before any installation or use to ensure optimal performance and longevity of the product.
2. Product Overview
The ACT MB012 Performance Organic Street Style Clutch Disc is a high-quality component designed to upgrade your vehicle's clutch system. It features premium organic friction material, offering a balance of high heat tolerance, quick recovery, and excellent friction characteristics for a long service life. The disc's construction includes steel-backed linings for superior burst strength and a robust center section engineered to resist failure even under demanding conditions. Its spring center design effectively dampens torsional vibrations, contributing to quieter operation and improved drivability.
Key Features:
- Special performance friction materials designed to withstand increased heat and abuse.
- Engineered for smooth engagement, quiet operation, and improved durability.
- Steel back linings provide extremely high burst strength.
- Center section built to resist failure even under harsh conditions.
- Modified for quicker shifting response.
- Certified SFI Spec. 1.1 for safety and performance standards.
Figure 2.1: Front view of the ACT Performance Clutch Pressure Plate Assembly. This component works in conjunction with the clutch disc to engage and disengage power from the engine to the transmission.
Figure 2.2: Angled view of the ACT Performance Clutch Pressure Plate Assembly, showing its robust construction and design features.
3. Setup and Installation
Installation of a clutch disc is a complex procedure that requires specialized tools, knowledge, and experience. It involves removing the transmission, flywheel, and old clutch components, followed by careful alignment and installation of the new clutch disc and pressure plate. ACT strongly recommends that installation be performed by a certified professional mechanic or a qualified automotive technician. Improper installation can lead to premature wear, poor performance, and potential damage to the clutch system or other vehicle components.
General Considerations for Professional Installers:
- Flywheel Inspection: Always inspect the flywheel for hot spots, cracks, or excessive wear. Resurfacing or replacement of the flywheel is often necessary to ensure proper clutch break-in and engagement.
- Pilot Bearing/Bushing: Replace the pilot bearing or bushing during clutch installation. A worn pilot bearing can cause input shaft wobble and premature clutch failure.
- Release Bearing: Always replace the release bearing (throw-out bearing) with a new one. Ensure it moves freely on the transmission input shaft sleeve.
- Clutch Alignment: Use a clutch alignment tool to properly center the clutch disc with the pilot bearing and pressure plate during installation.
- Torque Specifications: Adhere strictly to the manufacturer's torque specifications for all fasteners, especially pressure plate bolts.
- Cleanliness: Ensure all mating surfaces are clean and free of oil, grease, or debris. Even small amounts of contaminants can affect clutch performance.
Figure 3.1: The ACT MB012 Performance Organic Street Style Clutch Disc. This component is crucial for transmitting power from the engine to the transmission.
4. Operating Principles
The clutch disc is a critical component of a manual transmission system, enabling the driver to connect and disconnect the engine's power from the transmission. When the clutch pedal is released, the pressure plate clamps the clutch disc against the flywheel, creating friction that allows the engine's rotational energy to be transferred to the transmission input shaft. This engagement facilitates vehicle movement.
When the clutch pedal is depressed, the pressure plate disengages from the clutch disc, breaking the connection between the engine and transmission. This allows for smooth gear changes without grinding or stalling the engine. The organic friction material of the ACT MB012 disc is designed to provide a balance of aggressive grip for performance and smooth, street-friendly engagement, minimizing harshness during daily driving.
5. Maintenance
While the ACT MB012 clutch disc is designed for durability, proper driving habits and periodic inspection can significantly extend its lifespan. As a wear item, the clutch disc will eventually require replacement. There is no routine maintenance required for the clutch disc itself once installed, but the overall clutch system should be monitored.
Tips for Extending Clutch Life:
- Avoid Riding the Clutch: Do not keep your foot on the clutch pedal unnecessarily, as this causes the clutch to slip and wear prematurely.
- Smooth Engagement: Engage the clutch smoothly and quickly, avoiding excessive slipping during acceleration from a stop.
- Proper Shifting: Ensure complete disengagement of the clutch before shifting gears to prevent grinding and undue stress on the clutch disc.
- Minimize Idling in Gear: When stopped for extended periods, shift to neutral and release the clutch pedal.
- Regular Inspections: During other transmission or engine work, have a qualified technician inspect the clutch system for signs of wear or fluid leaks.
6. Troubleshooting
If you experience issues with your clutch system, it's important to diagnose the problem correctly. Many clutch-related symptoms can be attributed to various components within the system, not just the clutch disc itself. Always consult a qualified mechanic for accurate diagnosis and repair.
Common Clutch Symptoms and Potential Causes:
| Symptom | Potential Cause(s) |
|---|---|
| Clutch Slipping (engine RPM increases but vehicle speed does not) | Worn clutch disc, oil/grease on friction surfaces, weak pressure plate, improper clutch adjustment, worn flywheel. |
| Clutch Grabbing/Chattering (rough engagement) | Contaminated friction surfaces, worn flywheel, worn pilot bearing, damaged pressure plate, loose engine/transmission mounts. |
| Difficulty Shifting Gears (especially into reverse or first) | Clutch not fully disengaging (dragging), air in hydraulic system, worn master/slave cylinder, bent clutch fork, worn pilot bearing. |
| Clutch Pedal Pulsation | Warped flywheel, worn pressure plate, bent input shaft. |
| Unusual Noises (squealing, grinding, rattling) | Worn release bearing, worn pilot bearing, worn input shaft bearing, damaged clutch components. |
7. Specifications
The following table provides key specifications for the ACT MB012 Performance Organic Street Style Clutch Disc:
| Specification | Value |
|---|---|
| Manufacturer | ACT |
| Brand | ACT |
| Item Weight | 3 pounds |
| Item Model Number | MB012 |
| Manufacturer Part Number | MB012 |
| OEM Part Number | MB012 |
| ASIN | B000CIK33E |
| Date First Available | November 23, 2005 |
8. Warranty and Support
The ACT MB012 Performance Organic Street Style Clutch Disc is backed by a 90-day limited manufacturer's warranty. This warranty covers defects in materials and workmanship under normal use and service. Please retain your proof of purchase for any warranty claims.
For technical support, warranty inquiries, or further assistance, please contact ACT customer service through their official website or authorized distributors. Always provide your product model number (MB012) and purchase details when seeking support to expedite the process.
For more information about ACT products and support, you may visit the official ACT store on Amazon: ACT Store.