JEGS 601090 Billet Aluminum Flexplate User Manual

1. Introduction

This manual provides essential information for the JEGS 601090 Billet Aluminum Flexplate. Designed for Small and Big Block Chevy engines, this flexplate is engineered for high performance and durability. Please read this manual thoroughly before installation and use to ensure proper function and safety.

2. Product Overview

The JEGS 601090 Flexplate is a precision-engineered component critical for transmitting power from the engine to the transmission. Its billet aluminum construction offers superior strength and reduced rotational mass compared to traditional steel flexplates.

Key Features:

• Designed for Small & Big Block Chevy applications.
• Features a 168-tooth replaceable gear for extended lifespan.
• Internally balanced for smooth operation and reduced vibration.
• Compatible with 2-piece rear main engine configurations.
• Offers dual converter bolt patterns (10.75" & 11.5") for versatility.
• SFI 29.1 Rated, ensuring compliance with safety standards for racing applications.
• Manufactured in the USA.

This image shows the full view of the JEGS 601090 Billet Aluminum Flexplate, highlighting its 168-tooth design and the SFI 29.1 certification label.

A detailed close-up of the JEGS flexplate, showing the precision-machined gear teeth and the secure mounting bolt for the replaceable gear.

3. Setup and Installation

Installation of a flexplate requires specialized tools and automotive knowledge. It is highly recommended that installation be performed by a qualified professional to ensure proper fitment, alignment, and safety.

General Installation Guidelines:

1. Safety First: Always disconnect the battery and ensure the vehicle is securely supported on jack stands or a lift. Wear appropriate personal protective equipment.
2. Compatibility Check: Verify that the flexplate's bolt patterns and balance type (internal) match your engine and torque converter specifications.
3. Cleanliness: Ensure all mating surfaces (crankshaft flange, flexplate, torque converter) are clean and free of debris, oil, or grease.
4. Mounting: Carefully align the flexplate with the crankshaft bolt holes. Use new, high-quality flexplate bolts and apply thread locker as recommended by engine manufacturer.
5. Torque Specifications: Torque all flexplate-to-crankshaft bolts to the manufacturer's specified values using a calibrated torque wrench. Follow a crisscross pattern for even tightening.
6. Torque Converter Engagement: Ensure the torque converter is fully seated into the transmission pump before mating the transmission to the engine. The flexplate should not be used to pull the torque converter into place.
7. Converter Bolt Torque: Once the transmission is bolted to the engine, install and torque the torque converter bolts to the flexplate, again following manufacturer specifications and a crisscross pattern.

Improper installation can lead to severe damage to the engine, transmission, and flexplate, and may void any warranties.

4. Usage Considerations

The JEGS 601090 Billet Aluminum Flexplate is designed for high-performance applications. Its SFI 29.1 rating signifies that it meets stringent safety standards for competitive motorsports, providing confidence in its structural integrity under extreme conditions.

The internally balanced design ensures smooth engine operation and minimizes vibrations, which is crucial for engine longevity and overall vehicle performance. The replaceable gear ring extends the life of the flexplate, allowing for cost-effective maintenance if the starter ring gear becomes worn.

5. Maintenance

Once properly installed, the JEGS 601090 Billet Aluminum Flexplate requires minimal routine maintenance. However, periodic inspection is recommended, especially during other drivetrain service or repair.

Inspection Points:

• Visual Inspection: Check for any signs of cracks, bends, or deformation on the flexplate surface.
• Gear Teeth: Inspect the 168-tooth gear for excessive wear, chipping, or damage, particularly where the starter engages.
• Bolt Tightness: Verify that all flexplate-to-crankshaft and flexplate-to-torque converter bolts remain tight and have not loosened over time.
• Balance Weights: Ensure any balance weights (if applicable and visible) are securely attached.

If any damage or excessive wear is observed, the flexplate should be replaced immediately to prevent further damage to the engine or transmission.

6. Troubleshooting and Common Inquiries

While the JEGS 601090 Flexplate is a robust component, certain issues can arise, often related to installation or other drivetrain components.

Common Issues and Potential Causes:

• Vibration: Can be caused by improper installation, incorrect balancing (though this flexplate is internally balanced), or issues with the torque converter or crankshaft. Ensure all bolts are torqued correctly.
• Starter Engagement Issues: Often due to worn starter motor, worn flexplate gear teeth, or improper shimming of the starter. Inspect the flexplate gear for damage.
• Cracks or Breakage: Typically a result of extreme stress, improper torque converter spacing, or incorrect installation. Immediate replacement is necessary.
• Noise from Bellhousing: Could indicate loose bolts, a cracked flexplate, or issues with the torque converter. Professional diagnosis is recommended.

For persistent issues, consult a certified automotive technician. Do not attempt to operate the vehicle with a damaged flexplate.

7. Specifications

8. Warranty and Support

For information regarding product warranty, returns, or technical support, please refer to the official JEGS website or contact JEGS customer service directly. Keep your purchase receipt as proof of purchase.

JEGS Contact Information:
Official JEGS Website
Refer to the website for current contact methods (phone, email, chat).