Target Audience:
Aircraft maintenance technicians, engine rebuilders, and owners of aircraft powered by Franklin 6A4-150 series engines
Primary Use:
Parts identification and ordering for overhaul, repair, and routine maintenance
Key Feature:
Exploded views and part number listings for the 6A4-150-B3 and 6A4-150-A3 engines, with a 1968 price supplement
Crankcase Section:
Crankcase halves, studs, bushings, and seals
Crankshaft Group:
Crankshaft, counterweights, bearings, and related hardware
Cylinders and Pistons:
Cylinder assemblies, pistons, rings, pins, and plugs
Connecting Rods:
Rods, bearings, bolts, and bushings
Valvetrain:
Camshaft, lifters, pushrods, rockers, valves, and springs
Oil System:
Oil pump, sump, lines, filters, and fittings
Fuel System Components:
Carburetor adapter and fuel system hardware
Ignition Components:
Magnetos, drive couplings, spark plugs, and harness hardware
Cooling:
Baffles, deflectors, and cooling air shrouding
Accessories:
Starter, generator, and accessory drive parts
Mounting Hardware:
Engine mounts and mounting cushions
Exploded Views:
Illustrated assemblies for locating individual parts
Part Numbers:
Complete Franklin part number listings for each assembly
Price Information:
1968 price supplement included
Effectivity:
Covers 6A4-150-B3 and 6A4-150-A3 variants
Parts Information:
Reference numbers keyed to illustrations for accurate ordering
Overhaul Procedures:
N/A - this is a parts catalog, not a service manual; overhaul tolerances are not included
Torque Specifications:
N/A - not specified in a parts catalog; consult the engine service manual
Wiring Diagrams:
N/A - not included in this publication
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Crash Test Ratings:
N/A - engine parts catalog; safety ratings apply to airframes, not engines
Related Systems:
Ignition, fuel, and oil system parts affecting engine reliability are covered
Airworthiness Note:
Use correct part numbers per catalog to maintain airworthiness; always follow FAA-approved data
Service Intervals:
N/A - not covered in a parts catalog; refer to the engine service manual and FAA requirements
Oil System Parts:
Pump, sump, lines, and filter hardware listed for overhaul and replacement
Common Wear Items:
Piston rings, bearings, valves, valve springs, and seals are individually itemized
Rebuild Support:
Complete part numbering supports full teardown and rebuild projects
Fluid Specifications:
N/A - use aviation-grade oil per the engine service manual
Manufacturer:
Franklin engine heritage through Aircooled Motors (Syracuse, New York)
Model Evolution:
6A4 series developed from the four-cylinder Franklin line into six-cylinder 150 hp variants, including the 6A4-150-A3 and -B3
Production Era:
1960s; catalog includes 1968 price list
Production Location:
Syracuse, New York, USA (Aircooled Motors era)
