M7 TM 9-774 CONFIGURATIONS PAGE 2
M7 " HALF-TRACK" IN SUMMER CONFIGURATION
In the above picture you get a nice view of the seating arrangement and the flue for the  engine preheater. Th flue is in its stored positon in the photo. To get proper draft and burning in the kerosene heater the flue has three sections the top teo storing inside the fixed bottom piece and pulled up for operation. The square hatch that can be seen between the right front tire and the right track gives you access to the preheater. You would open a butterfly clamp and rotate the door out of the way giving you access to the bottom of the preheater for starting the burner.