TM 9-2320-361-20 1-19. POWER SYSTEMS OPERATION (Contd) e. Exhaust System Operation. The exhaust system directs exhaust gases away from the vehicle and crew compartment. The exhaust configuration is identical for all models covered in this manual with the exception of the M50A2 and M50A3 models which have an exhaust pipe cap. Both configurations are covered here: EXHAUST PIPES - Direct exhaust gases away from vehicle and crew compartment. EXHAUST PIPE SHIELD - Protects personnel from hot exhaust pipes. EXHAUST PIPE CAP (M50A2 and M50A3 only) - Used in cold weather to prevent exhaust gases from escaping from exhaust pipe. This forces gases through the exhaust pipes beneath the water tank keeping the water from freezing. Gases then exit through rear of vehicle. 1-53