Engine Family:
6A4 series horizontally opposed six-cylinder aircraft engines
Model Variants:
6A4-150 and 6A4-165
Production Years Covered:
N/A - not specified in the manual
Application:
General aviation aircraft, including Stinson models
Target Audience:
Aircraft owners, A&P mechanics, and technicians
Engine Class:
Air-cooled, naturally aspirated, carbureted piston engines
Competitive Advantage:
Detailed tune-up, overhaul, and troubleshooting data in one volume
Key Features:
Horizontally opposed six-cylinder layout
Key Features:
Aluminum alloy cylinders with steel sleeves
Key Features:
Forged steel crankshaft
Key Features:
Magneto ignition
Manual Type:
Service and repair manual
Delivery:
Instant download
Page Count:
N/A - not specified in the source description
Coverage Areas:
Tune-up, lubrication, component overhaul, troubleshooting
Engine Mechanical:
Cylinders, pistons, connecting rods, crankshaft, crankcase
Cylinder Assemblies:
Aluminum alloy cylinders with steel sleeves
Valve Train:
Valve adjustment and service procedures
Ignition System:
Magneto ignition service and timing
Induction System:
Carburetor and induction servicing
Lubrication System:
Oil pump, lines, and lubrication specifications
Cooling:
Air-cooled cylinder and baffle inspection
Fuel System:
Carbureted fuel delivery components
Exhaust:
Exhaust system inspection and service
Accessory Section:
Accessory drives and mounted components
Electrical:
Ignition and related electrical components
Tune-Up:
Detailed tune-up procedures provided
Overhaul:
Component overhaul instructions included
Troubleshooting:
Troubleshooting guidance included
Adjustments:
Engine adjustment procedures described
Inspection:
Inspection and measurement steps covered
Specifications:
Service limits and component specifications
Maintenance Schedules:
Scheduled maintenance intervals provided
Illustrations:
N/A - not specified in the source description
Parts Data:
Component identification and service information for overhaul
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
Configuration:
Horizontally opposed, air-cooled, six-cylinder
Model 6A4-150 Displacement:
232.3 cubic inches (3.81 liters)
Model 6A4-150 Power:
150 horsepower
Model 6A4-165 Displacement:
249.9 cubic inches (4.10 liters)
Model 6A4-165 Power:
165 horsepower
Construction and Fuel System
Induction:
Naturally aspirated, carbureted
Ignition:
Magneto ignition
Cylinders:
Aluminum alloy with steel sleeves
Standard Transmission:
Direct-drive propeller mounting
Optional Transmission:
N/A - no reduction gearing offered for this engine series
Features:
Flanged crankshaft for propeller attachment
Features:
Direct engine-to-propeller drive
Fluid:
N/A - direct drive, no transmission fluid required
Crash Test Ratings:
N/A - not applicable to aircraft engines
Type Certification:
N/A - not specified in the source description
Active Features:
Magneto ignition providing independent ignition circuits
Passive Features:
Air-cooled cylinder construction for thermal stability
Passive Features:
Forged steel crankshaft for structural integrity
Service Intervals:
Scheduled maintenance intervals provided in the manual
Lubrication:
Lubrication specifications included
Tune-Up:
Detailed tune-up procedures included
Valves:
Inspect and adjust valve clearance as scheduled
Ignition:
Magneto and spark plug service at scheduled intervals
Cylinders:
Inspect steel-sleeved cylinder bores for wear
Fluids:
Use lubricants meeting the manual's lubrication specifications
Known Issues:
N/A - refer to the manual's troubleshooting section for symptoms
