1. Engine Manufacturer’s Manual  2. BuAer Manual 14-101 to 14-506  References:  In starting, proceed as follows:  (a) In cold weather plug in oil tank electric heater until  tank feels warm to the hand.  (b) Turn the engines over four or five revolutions by pull› ing the propeller through by hand.  (c) Set carburetor heat control in "cold" position.  -53- The starters are of the hand electric inertia type.  (a) K-3 thru K-8 :  Take-off rating:  Normal rating:  Gear Ratio:  Fuel:  Oil:  (b)  From K-9 on:  Normal Rating:  Gear Ratio:  Fuel:  R-975-28 Wright Aero.  450 H.P. at 2250 r.p.m. at  sea level.  420 H.P. at 2200 r.p.m. at  sea level.  Direct Drive  Aviation grade, 91 octane,  AN Spec. AN-F-26  W.A.C. Spec. No. 5815  R 1340 - AN Pratt & Whitney Wasp  425 H.P. at 1775 r.p.m. at  sea level  3:2  AN Spec. No. AN-VV-0-446a  A. ENGINES  =======III- POWER •PLANT  (1) General Characteristics  (2) Starting 