Junkers Jumo 210 — Engine Manuals Collection

A curated collection of 14 primary-source factory documents covering the Junkers Jumo 210 liquid-cooled inverted V-12 aircraft engine, variants B/C, D, and G. All documents are in German language unless otherwise noted.

The Jumo 210 was Germany's first production gasoline V-12 and the primary Luftwaffe fighter engine of the pre-war era, powering the Messerschmitt Bf 109, Junkers Ju 87 Stuka, Bf 110, and Heinkel He 112. Evolved from the Junkers L10 project, it saw combat in the Spanish Civil War with the Condor Legion. Over 6,400 units were produced between 1934 and 1938.

Variant B / C — 4 Manuals

• Jumo 210 B/C Operating Instructions
  Jumo 210 B and C Aircraft Engine Operating and Maintenance Instructions Manual — Betriebsanweisung und Wartungsvorschrift (German Language)
• Jumo 210 B/C Engine Subsystems — 3 documents:
  – Bosch GE 12 BRS 162/163 Magneto Manual — Bosch Magnetzünder GE 12 (German Language)
  – Junkers Fuel Pump Size 3 Manual — Kraftstoff-Förderpumpe Grösse 3 Linkslaufend (German Language)
  – SUM 676 Carburetor for Jumo 210 B and C Piston Aero Engine Manual — SUM-Vergaser 676 (German Language)

Variant D — 4 Manuals

• Jumo 210 D Operating Instructions
  Jumo 210 D Aircraft Engine Operating and Maintenance Instructions Manual — Betriebsanweisung und Wartungsvorschrift (German Language)
• Jumo 210 D Repair Instructions
  Jumo 210 D Aircraft Engine Description and Partial Overhaul Instructions Manual — Beschreibung und Teilüberholungsanleitung (German Language)
• Jumo 210 D Engine Subsystems
  Jumo 210 D Aircraft Engine Operating and Maintenance Instructions Manual Part 12 — Carburetor / Vergaser (German Language)
• Jumo 210 D Illustrated Parts Catalog
  Jumo 210 D Aircraft Engine – Illustrated Parts Catalog — Ersatzteilliste (German Language)

Variant G — 2 Manuals

• Jumo 210 G Operating Instructions
  Jumo 210 G Aircraft Engine Operating and Maintenance Instructions Manual — Betriebsanweisung und Wartungsvorschrift (German Language)
• Jumo 210 G Repair Instructions
  Jumo 210 G Aircraft Engine Description and Partial Overhaul Instructions Manual — Beschreibung und Teilüberholungsanleitung L.Dv.T. 861/2 (German Language)

Non-Variant Manuals — 4 Manuals

• Jumo 210 Illustrated Parts Catalog
  Jumo 210 Aircraft Engines Electrical Equipment Spare Parts Catalog — Ersatzteile für die elektrische Ausrüstung von Junkers Flugmotoren (German Language)
• Jumo 210 Technical Publications
  Development of the Junkers High-Power Aero Engine Jumo 210 — Entwicklung des Junkers-Hochleistungs-Flugmotors JUMO 210 (German and English Language)
• Jumo 210 Brochures & Training
  Jumo 210 Aircraft Engine Training Course Data Sheet — Lehrgang für Flugmonteure Motor – Mustertafel (German Language)
• Jumo 210 Ground Support Equipment
  Motorrüst- und Abstellböcke C und D — Engine Stands C and D, Operating and Application Instructions — Motorrüst- und Abstellböcke (German Language)

Historical Background

Designed by Junkers Flugzeug- und Motorenwerke AG and evolved from the Junkers L10 project, the Jumo 210 was Germany's first production gasoline V-12 aero engine. Its key variants:

• Jumo 210 A/B/C/D — Carburetor-equipped early production variants
• Jumo 210 G — Landmark variant introducing direct fuel injection and a two-speed supercharger — the world's first production engine with this technology

The Jumo 210 saw its combat debut in the Spanish Civil War with the Condor Legion, before being superseded by larger, more powerful engines as the war progressed.

Technical Specifications

• Type: Liquid-cooled inverted V-12 piston engine
• Cylinders: 12 in 60° inverted V configuration
• Displacement: 19.7 litres (1,202 cu in)
• Bore × Stroke: 124 mm × 136 mm
• Compression Ratio: 6.5:1
• Power Output: 600 – 720 hp (610 – 730 PS)
• Dry Weight: 442 kg (974 lbs)
• Fuel: B4 grade, 87 octane aviation gasoline

Notable Engineering Features

• Three valves per cylinder (two intake, one exhaust)
• World’s first production engine with direct fuel injection — introduced on the Jumo 210G variant
• Two-speed supercharger on the G variant

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