Model Variant:
N/A - multiple sub-variants (e.g., SB, AN, etc.) covered by this manual
Production Years Covered:
1929 to 1950s (historical engine; exact range not specified in manual)
Target Audience:
Aircraft technicians, pilots, and owners of aircraft equipped with the R-985 Wasp Junior engine
Competitive Advantage:
Reliable, proven radial engine with widespread use; manual provides factory operation procedures
Design:
9-cylinder air-cooled radial, direct drive or geared
Power:
450 hp (336 kW) at 2300 rpm
Fuel System:
Carburetor (float-type), dual magnetos
Manual Type:
Operation Manual
Delivery:
Instant download
Engine Operation:
Starting, normal operation, shutdown, emergency procedures
Systems:
Fuel, ignition, lubrication, cooling, induction, exhaust
Maintenance:
Routine checks, servicing, troubleshooting
Fuel System:
Carburetor, fuel pump, lines, primer
Ignition System:
Dual magnetos, spark plugs, ignition harness
Lubrication System:
Wet sump, oil pump, oil cooler, lines
Cooling System:
Air cooling, cylinder fins, baffles
Induction System:
Air filter, carburetor heat, manifold
Exhaust System:
Exhaust collectors, mufflers
Propeller:
Governor, pitch control (if applicable)
Electrical System:
Starter, generator, wiring
Pre-Flight Checks:
Inspection points, fluid levels, controls
Starting Procedures:
Normal, cold weather, hot weather
Operational Checks:
Run-up, magneto check, carburetor heat
In-Flight Management:
Power settings, mixture control, engine monitoring
Shutdown Procedures:
Normal and emergency
Troubleshooting:
Common issues and remedies
Maintenance:
Scheduled inspections, component replacement
Detail Level:
Step-by-step instructions with specifications and tolerances
Illustrations:
Diagrams and schematics included (digital reproduction)
Tables:
Performance data, torque values, fluid capacities
Part Numbers:
Referenced where applicable
Component Identification:
Nomenclature and location
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
Engine Type:
Radial Air-Cooled
Displacement:
985 cubic inches (16.1 L)
Bore:
4.5 inches (114.3 mm)
Stroke:
5.5 inches (139.7 mm)
Power Output:
450 hp (336 kW) at 2300 rpm
Torque:
N/A - not specified in manual
Fuel Type:
Aviation Gasoline (Avgas)
Fuel Octane Rating:
80/87 or higher
Carburetor:
Float-type, with mixture control
Ignition System:
Dual Magnetos
Lubrication System:
Wet Sump
Length:
N/A - not specified in manual
Width:
N/A - not specified in manual
Height:
N/A - not specified in manual
Wheelbase:
N/A - not applicable to engine
Dry Weight:
Approximately 650 lbs (295 kg)
Service Interval:
Refer to Manual
Oil Capacity:
10 gallons (37.8 L)
Recommended Oil Type:
Refer to Manual (Aviation Grade Oil)
Fuel Type:
Aviation Gasoline (Avgas)
Known Issues / Common Wear Items
Common Wear Items:
Spark plugs, ignition harness, oil seals, gaskets
Known Issues:
N/A - refer to manual for troubleshooting
