page_title: Daimler Double-Six sleeve-valve V12
section_title: Design changes
hierarchical_section_title: Daimler Double-Six sleeve-valve V12 / 5.3-litre Double-Six 30/40 or Light Double-Six / Design changes
caption_attribution_description: Queen Mary's State Limousine
context_page_description: Daimler Double-Six piston engine was a sleeve-valve V12 engine manufactured by The Daimler Company Limited of Coventry, England between 1926 and 1938 in four different sizes for their flagship cars.
context_section_description: Engine
  Cylinder block a one-piece light alloy casting
  Distributors were moved to the back of the engine
  Cover plates provided in the crankcase which could be removed to reveal the sleeve-eccentric links
  Carburettors moved forward
  Lubrication by two submerged helical-gear pumps, one feeding all moving parts, the other circulating oil through the oil radiator
  Oil radiator to maintain a constant 130 °F (54 °C)
  Cold viscid oil forced open valves allowing oil into troughs below the big-ends to provide cold-start splash lubrication of the sleeves
  Hand-operated oil cleaner
  Water pumps on outside of each cylinder bank mounted in tandem with dynamos
  This model was usually supplied with a taller and more slender radiator.
  Chassis
  Grouped chassis lubrication
  Back axle incorporating dip-stick cum oiling syringe
  Hydraulic shock absorbers
  Wheelbase:
  Short wheelbase 138 in (3,505 mm) Track 60.0 in (1,524 mm)
  Medium wheelbase 147.5 in (3,746 mm) Track 60.0 in (1,524 mm)
  Long wheelbase 157.0 in (3,988 mm) Track 60.0 in (1,524 mm)
caption: Double-Six 40/50 limousine
  for King George V
exif: {"Image Orientation": "Horizontal (normal)", "Image Software": "Microsoft Windows Photo Gallery 6.0.6001.18000", "Image DateTime": "2010:06:27 20:09:33", "Image ExifOffset": "2202", "Image Padding": "[]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "1/0", "Thumbnail YResolution": "1/0", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "4420", "Thumbnail JPEGInterchangeFormatLength": "2383", "EXIF ImageUniqueID": "7BE56C72A3E24821BE2282A81215D321", "EXIF Padding": "[]"}