TM 9-2320-209-20-3-1 4-22. MANIFOLD HEATER IGNITION UNIT REMOVAL AND REPLACEMENT (TRUCKS WITH ENGINES LDS 427-2 AND LDS 465-1). WARNING Voltage output of ignition unit can cause dangerous electrical shock. Do not touch any uninsulated or live connections until you make sure manifold heater switch is in OFF position. TOOLS : 1/2-inch wrench Socket set, 3/8-inch drive 7/8-inch wrench Pliers SUPPLIES : None PERSONNEL: One EQUIPMENT CONDITION : Truck parked, engine off, manifold heater switch in OFF position, handbrake set. Preliminary Procedure. Open hood and right side panel for engine access. Refer to TM 9-2320-209-10. b. Removal. FRAME 1 I 1. Using pliers, unscrew connector (1) and take it off ignition unit (2) . 2. Using 7/8-inch open end wrench, unscrew nut (3) and pull ignition lead (4) out of ignition unit (2) . GO TO FRAME 2 4-123