Carrier DM-4 Power Pack Operation And Service Manual

Contents

4-24.2 PRIMING THE FUEL SYSTEMThe engine is equipped with a mechanical fuel liftpump, it is mounted on the engine next to the injectionpump. This pump has a manual plunger for bleeding fuelwhen the fuel tank has been run dry.Since the unit employs a closed fuel circuit, the follow-ing steps are recommended:1. Turn bleed valve (Red) counter---clockwise until ful-ly opened.2. Turn the top of the manual plunger counter-clock-wise to unlock it. Then rapidly hand pump the hand plung-er until positive pressure (resistance) is felt, which will in-dicate fuel flow.3. Depress and turn the top of the manual plungerclockwise to lock it in place.4. Start engine.5. When engine is running properly, turn bleed valveclockwise until fully closed.4.3 ENGINE SERVICE AND COMPONENTS4.3.1 Cooling SystemAir flows through the radiator by using the electricfans. The radiator, externally and internally must be cleanfor adequate cooling. The water pump V-belt must be ad-justed periodically to provide maximum efficiency. (Referto section 4.4.1)Do the following service to the cooling systemCAUTIONUse only ethylene glycol coolant (with inhibitors)in system as glycol by itself will damage thesystem. Always add pre-mixed 50/50 coolant andwater to radiator/engine. Never exceed morethan 50% concentration of coolant. Use a lowsilicate coolant meeting GM specification GM6038M or equal.1. Remove all foreign matter from the radiator coil byreversing the normal air flow. Compressed air or watermay be used as a cleaning agent. It may be necessary to usewarm water mixed with any good commercial detergent.Rinse with fresh water if a detergent is used.2. Drain coolant completely by removing lower radia-tor hose and radiator cap.3. Install hose and fill system with clean, untreated wa-ter to which three to five percent of an alkaline base radia-tor cleaner should be added (6 oz. dry to one gallon)4. Run engine 6 to 12 hours and drain system whilewarm. Rinse system three times after it has cooled down.Refill system with water.5. Run engine to operating temperature. Drain systemagain and fill with treated water/coolant. (see CautionNote and refer to section 1.2) NEVER POUR COLDWATER INTO A HOT ENGINE, however hot water canalways be added to a cold engine.4.3.2 Lube Oil FilterAfter warming up the engine, stop engine, removedrain plug from the reservoir and drain engine lube oil.Lightly oil gasket on filter before installing.CAUTIONWhen changing oil filter, the new filter should beprimed with clean oil, if the filter is not primed,the engine may operate for a period with no oilsupplied to the bearings.Replace filter and add lube oil. (Refer to section 1.4)Warm up engine and check for leaks.4.3.3 Servicing the Speed Control Solenoid and Linkage12 3541. Solenoid2. Bolt3. Solenoid Bracket4. Linkage (Speed)5. ClipFigure 4-1. Speed Control Solenoid1. Disconnect wiring to solenoid. Disconnect linkagearm (item 4) from solenoid. Remove mounting hardwarefrom solenoid and then remove solenoid.2. Install replacement solenoid and mounting hard-ware. Do not tighten at this time.3. Attach linkage to solenoid and install the clip to thesolenoid arm.4. Hold the speed lever against the high speed stop andcheck the rpm (refer to section 1-2) Adjust the low speedstop screw stop if necessary.5. Check engine speed. With the engine stopped, placea mark on the crankshaft sheave (white paint for exam-ple). Speed may be verified by a Strobette model 964(strobe tachometer) Carrier Transicold P/N 07-00206.6. Hold the speed lever against the high speed stop andcheck the rpm (refer to section 1-2). Adjust the high speedstop screw if necessary.7. Energize the speed solenoid. Push the solenoid sothat the speed arm rests against the high speed stop screwand tighten the solenoid mounting bolts. Connect wires tosolenoid.