Use and Operation of Natural Gas Engines

3.1 Unpacking of natural gas engines

After unpacking the natural gas engine, the user shall count the engine and its accessories first in accordance with the packing list. After that, the user shall check the engine appearance for damage and the connecting pieces for looseness, and complete the following works:

◆ Wipe the antirust coat and corrosion inhibitor on the exposed parts;

◆ If the oil pan is not filled with oil, according to the agreement between the manufacturer and the user, fill oil into it. If the oil pan is filled with engine oil containing running-in accelerating agent before leaving our factory, we suggest that the user drain off the old oil and replace with new oil after 50 hours of trial operation.

◆ If the engine is filled with coolant before leaving our factory based on the user needs, according to the agreement between the manufacturer and the user, the user shall check the performance of coolant after unpacking the engine. The coolant is usable if it can lower the freezing point down to -30℃ or -35℃, with a PH value between 7 and 8 (neutral) and the total hardness value is between 5 and 15°d [9 and 15°f (hardness)]; otherwise, the user shall drain off the coolant, and refill coolant containing anti-freeze additive into the engine.

3.2 Lifting of natural gas engines

Being lifted, the center line of engine crankshaft shall keep horizontal. Lifting when engine is not upright or without lifting frame is strictly prohibited. The lifting up and down shall be carried out slowly (see Figure 3-1). Figure 3-1 Lifting diagram of natural gas engines 3.3 Installation of natural gas engines

1. During installation, the center line of engine crankshaft and the input shaft axis of transmission gear (gear case, gearbox or generator, etc) shall be coaxial, and the crankshaft shall not be subject to the additional axial force caused by installation.

2. The natural gas system design shall minimize the number of connection points on the high-pressure pipeline and guarantee the convenient construction, good sealing, easy-to-check and high reliability of connection points on the pipeline.

3. The high-pressure pipeline of natural gas system shall be provided with an upstream over-current protection device to cut off the natural gas line reliably when the ignition switch is off, the engine is not running or a lot of gas is leaking from the low-pressure pipeline accidentally.

4. Test each connection point of the natural gas system with leakage detecting liquid under the rated working pressure of the natural gas system, and each connecting point shall be free from any bubble within 1 minute. Correct Wrong Operation & Maintenance Manual for WP13NG Series Gas Generators Green Power International Weichai 17 Alternatively, test each connection point of the natural gas system with a gas detector which is not lower than 25× 6 10 in measurement accuracy, and the detector shall not give an alarm.

5. The materials of gas interface parts shall fit to the gas medium, service life and ambient temperature; the interface shall be made of corrosion-resistant metallic material. The copper which is sparkproof by friction is preferred. Its copper content shall not be higher than 70% and its hardness shall not be lower than HRB60.

6. The power ground wire and the digital/analogue ground wire of the system shall be connected to the negative electrode of battery separately.

3.4 Preparatory work before startup

1. Check the coolant level If the coolant is insufficient, open the filler cap to add more coolant. If the engine is hot when the filler cap provided with a pressure relief valve and an exhaust button is opened, the operator shall stop the engine, and fill coolant after the engine is cooled down. Filling a lot of coolant when the engine is still hot is strictly prohibited, as the great change in temperature may cause parts damage.

2. Check the engine oil level The engine oil level shall be between the upper and lower scale marks of oil dipstick. Fill engine oil via the filler if necessary.

3. Check various engine accessories Check whether each engine accessory is connected reliably; if not, correct the same. Check whether the circuit of starting system is connected normally and whether the battery is charged sufficiently.

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