This manual covers the Franklin 6A4 Series Aircraft Engine, including variants such as the 6A4-150-B3, 6A4-150-B31, and 6A4-165-B3. These air-cooled, horizontally opposed, 6-cylinder engines are known for their reliability and were commonly used in Stinson Aircraft and other aviation applications. With a displacement of 310.4 cubic inches, these engines offered power outputs of 150 hp or 165 hp, making them suitable for a range of general aviation needs. Their robust engineering ensures dependable performance in demanding flight conditions.

The purpose of this Service and Repair Manual is to provide comprehensive guidance for the maintenance and repair of the Franklin 6A4 Series Aircraft Engine. It details essential procedures, technical specifications, and troubleshooting steps necessary for optimal engine operation and longevity. This document is an indispensable resource for owners, mechanics, and technicians, offering clear instructions on everything from routine oil changes and spark plug replacement to major overhauls, ensuring the continued airworthiness and performance of the engine.

This manual covers the Franklin 6A4 Series Aircraft Engine, including variants such as the 6A4-150-B3, 6A4-150-B31, and 6A4-165-B3. These air-cooled, horizontally opposed, 6-cylinder engines are known for their reliability and were commonly used in Stinson Aircraft and other aviation applications. With a displacement of 310.4 cubic inches, these engines offered power outputs of 150 hp or 165 hp, making them suitable for a range of general aviation needs. Their robust engineering ensures dependable performance in demanding flight conditions.

The purpose of this Service and Repair Manual is to provide comprehensive guidance for the maintenance and repair of the Franklin 6A4 Series Aircraft Engine. It details essential procedures, technical specifications, and troubleshooting steps necessary for optimal engine operation and longevity. This document is an indispensable resource for owners, mechanics, and technicians, offering clear instructions on everything from routine oil changes and spark plug replacement to major overhauls, ensuring the continued airworthiness and performance of the engine.