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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