TM 10-3930-671-24 Precise   distribution   between   cylinders,   inherent   in   the pump design, and the ability to preset fuel flow eliminates lengthy  periods  on  the  test  stand.    The  pump  is  self- lubricated, contains essentially the same number of parts regardless    of    the    number    of    cylinders    served,    and operates in any position. IMPROVED DESIGN FEATURES The  addition  of  the  Model  DB2  injection  pump  to  the Roosa Master line of fuel injection equipment incorporates  many  design  improvements  and  has  been durability  tested  for  more  than  200,000  hours  prior  to release for production. IMPROVED DESIGN FEATURES INCLUDE: 1. Housing a. Cast-in, hardened throttle bosses. b. Larger diameter advance bosses. c. Cast-in  wrench  boss  for  timing  (on  some models). d. New straight thread return oil fitting. 2. Head and Rotor a. Easily accessible vent wire assembly. b. Integral angled discharge fittings. 3. Automatic Advance a. Sintered  metal  cam  standard  on  light  duty applications. F-213