ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 1-6 Table 1-2.  ENGINE OPTION CODES - 6 CYLINDER, 6.8 LITER (CONTINUED) ENGINE BASE CODE:  2136F OPTION CODES DESCRIPTION REMARKS 1104 Rocker Arm Cover 1215 Oil Filler Neck 1306 Crankshaft Pulley 1426 Flywheel Housing 1544 Flywheel 1681 Fuel Injection Pump 1729 Air Inlet 1907 Oil Pan 2001 Water Pump 2112 Thermostat Cover 2201 Thermostat 2301 Fan Drive 2486 Fan Belt 2599 Fan Not installed on engine at factory. 2699 Engine Coolant Heater Not installed on engine at factory. 2808 Exhaust Manifold 2999 Ventilator System Not installed on engine at factory. 3044 Starting Motor 3110 Alternator 3518 Fuel Filter 3601 Front Plate 3702 Fuel Transfer Pump 3999 Thermostat Housing Not installed on engine at factory. 4019 Oil Dipstick 4199 Belt Driven Front Auxiliary Drive Not installed on engine at factory. 4399 Starting Aid Not installed on engine at factory. 4401 Timing Gear Cover with Gears 4603 Cylinder Block With Liners and Camshaft 4702 Crankshaft and Bearings 4807 Connecting Rods and Pistons