TM 9-2320-209-20-3-1 4-20. ENGINE MANIFOLD HEATER PUMP LINES AND FITTINGS REMOVAL AND REPLACEMENT (TRUCKS WITH ENGINES LDS 427-2 AND LDS 465-l). TOOLS : Flat-tip screwdriver 7/16-inch open end wrench 9/16-inch open end wrench l/2-inch open end wrench 9/16-inch socket wrench Pliers 3/8-inch open end wrench SUPPLIES: Solvent, dry cleaning type II (SD-2), Fed. Spec P-D-680 Sealer compound, type II, Mil Spec S-45180 EQUIPMENT CONDITION: Truck parked, engine off, manifold heater switch in OFF position, handbrake set. a. Preliminary Procedures. (1) (2) Take off intake air cleaner. Refer to para 4-3. Disconnect battery ground cable. Refer to para 7-58. NOTE Tag all fuel lines before taking them off so that they will be put back in the same place. b. Removal. 1. Using 3/8-inch open end wrenches, unscrew coupling nut (1) from union (2). 2. Pull fuel supply tube (3) away from union (2). 3. Using 7/16-inch open end wrench, unscrew coupling nut (4) from elbow (5). 4. Pull fuel return tube (6) away from elbow (5). GO TO FRAME 2 TA 047040 4-102