The Kinner R-440 (and its civilian counterparts, the B-5 and R-5 series) was a foundational American radial engine that powered the majority of primary trainers used by the U.S. and its allies during World War II. This structured collection brings together service manuals, overhaul instructions, parts catalogs, and operational documentation for the complete Kinner R-440/B-5/K-5/R-5 family, covering variants from the original 125 hp B-5 through the refined 160 hp R-56.

Definitive Collection with Free Lifetime Updates: This is a living collection that we continuously expand and refine. As we acquire additional Kinner documentation, technical bulletins, or variant-specific materials, we update this collection and provide free lifetime updates to all purchasers. Your one-time purchase guarantees access to all future additions and improvements to this collection.

Historical Note

The Kinner R-440 series emerged in the early 1930s as an evolution of the earlier 100 hp Kinner K-5, with increased cylinder bore delivering 125 hp in the B-5/R-440-1 configuration. Kinner Airplane & Motor Corporation (later Kinner Motors Inc.) introduced the B-5 in 1930 and the enlarged R-5 in 1932, creating a family of simple, rugged five-cylinder radial engines that would become synonymous with primary flight training.

During World War II, Kinner engines powered thousands of primary trainers including the Ryan PT-22 Recruit, Fleet Finch, and Meyers OTW, teaching a generation of Allied pilots the fundamentals of flight. The R-55 and R-56 military variants incorporated refinements such as torsional vibration dampers and automatic valve gear lubrication, while maintaining the characteristic exposed pushrods and rockers that required manual greasing before each flight.

Produced in the thousands from the early 1930s through 1945, Kinner engines earned a reputation for being "rough running" but highly reliable. Post-war, surplus Kinner-powered aircraft flooded the civilian market, finding new life in crop dusting operations and vintage biplane restorations. Today, Kinner R-440 engines continue to power flying Ryan PT-22s, Fleet Finches, and various Waco and Great Lakes replicas, maintained by dedicated vintage aviation enthusiasts.

Manuals Included in This Collection

• Kinner R-5-1, R-5 Series 2, R-53, R-55 Aircraft Engine Parts Manual - 1942
• Kinner R-52, R-55, R-53 Aircraft Engine Overhaul Manual
• Kinner R-52, R-55, R-53 Aircraft Engine Operating Maintenance Manual
• Kinner R-56 Aircraft Engine Parts Catalog Manual
• Kinner K-5 Aircraft Engine Lubrication Instructions Manual
• Kinner K-5 Aircraft Engine Instructions for the Care and Operation Manual
• Kinner B-5, B-5R, B-54 Aircraft Engine Instructions for Operation and Maintenance Manual - 1943
• Kinner B-5 Aircraft Engine Instructions for the Care and Operation Manual
• Kinner R-440-3 Aircraft Engine Overhaul Manual
• Kinner Service Bulletins - 1940
• Kinner Service Bulletins (additional)
• Kinner Brochures, Documents, and Technical Information

This collection spans the complete Kinner R-440 family from the original B-5 and K-5 through the military R-52, R-53, R-55, and R-56 variants, providing comprehensive coverage of parts identification, overhaul procedures, operational guidelines, and service bulletins from the 1930s through 1945.

Engineering Norms and Standards

Military Specifications: Kinner R-5 series engines (R-52, R-53, R-55, R-56) were developed to military specifications for primary trainer aircraft, meeting U.S. Army Air Corps requirements for reliability, maintainability, and standardized training operations.

Civilian Type Certificate: The B-5 and R-5 civilian variants operated under CAR 13 (Civil Air Regulations) certification standards of the 1930s and 1940s. Current Type Certificate holder is Gladden Products Corp, the historical successor maintaining certification records.

Technical Specifications:

• Engine type: Five-cylinder, air-cooled, radial
• Displacement: 441 cubic inches (7.23 liters) for B-5/R-440; 540 cubic inches (8.85 liters) for R-5/R-540
• Horsepower range: 125 hp (B-5) to 160 hp (R-5/R-55/R-56)
• Bore and stroke: 4.625 x 5.25 inches (B-5); 5.0 x 5.5 inches (R-5)
• Compression ratio: 5.25:1 (B-5) to 5.5:1 (R-5)
• Weight: Approximately 295 lbs (B-5) to 330–350 lbs (R-5 series)
• Fuel type: 73 octane aviation gasoline

Kinner Engineering Practices: Kinner engines featured simple, rugged construction with exposed valve train components requiring manual lubrication. The design prioritized ease of maintenance and field serviceability, with straightforward overhaul procedures suitable for military training environments and civilian operators.

Specialized Documentation

Service Bulletins & Airworthiness Directives: Active Service Bulletins and ADs address cylinder head cracking and master rod inspections. Operators of flying Kinner-powered aircraft should consult Gladden Products Corp and the FAA for current airworthiness requirements.

Operational Notes: Kinner engines require pre-flight manual greasing of exposed pushrods and rockers. The characteristic "rough running" operation is normal for this engine family and reflects the five-cylinder configuration and valve train design.

Where to Find Additional Documentation

Official Support: Gladden Products Corp maintains the Type Certificate for Kinner engines and can provide current airworthiness guidance, Service Bulletins, and certification records.

Historical Archives: The Antique Airplane Association, Ryan PT-22 Recruit Association, and vintage trainer enthusiast forums maintain extensive Kinner engine knowledge bases, operational experiences, and restoration guidance from active operators.

Specialty Vendors: Online Aviation Library and similar documentation providers offer historical manuals and reference materials. Specialized engine overhaul shops with Kinner experience can provide practical operational guidance and parts sourcing assistance.

Format and Delivery

This collection is delivered as an instant digital download in PDF format. All manuals are organized in a clear folder structure, fully searchable, and compatible with Windows, Mac, iOS, and Android devices. Files are print-friendly for workshop reference and can be viewed on tablets or smartphones in the hangar or field.

Disclaimer

These manuals are provided for historical reference, research, and educational purposes only. For current airworthiness requirements, maintenance procedures, and operational guidance for flying aircraft, always consult the current Type Certificate holder (Gladden Products Corp), applicable Airworthiness Directives, and FAA-approved maintenance procedures. This digital compilation, structure, indexing, and presentation are © Sicuro Publishing.