Moteurs Baudouin 12M26 Series, Operation & Maintenance Manual

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Operation & Maintenance Manual for 12M26 Series Gas Engine
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Table 5-1 Engine faults and analysis
Common Faults Possible Causes Fault Inspection and Treatment
1. The engine
cannot be
started
1. The natural gas bottle is empty or the
hand valve on gas bottle is not opened.
2. The gas pressure is too low.
Check the gas pipeline for gas leak.
Check the gas valve for being open.
Check the solenoid cut-off valve is
work.
3. There is no sufficient gas intake
Check the air filter and gas intake system
for blockage and air leak.
4. The start-up rotating speed is too low
(the minimum start-up rotating speed is
100r/m)
Check whether the battery voltage can
reach 24V.
5. The intake and exhaust valve adjustment
is wrong Check the valve clearance according to the
operation manual for engine.
6. The engine control module (ECU) is
damaged.
Replace the ECU.
7. The melted connector clip of oxygen
sensor causes short circuit.
Replace the oxygen sensor.
8. The electronic throttle valve is broken.
Test the electronic throttle valve using
software.
9. The velocity sensor is in fault.
Check the clearance between fluted disc
and sensor.
10.MAP is broken. Check the MAP by sofeware.
11.Earth trap wire is loose.
Check the wiring harness is monted
firmly.
2. The idle
speed is
unstable
1. There is air leak in the air intake pipeline Check the air intake pipeline
2. The spark plug or ignition system is in
fault
Check the spark plug and high-pressure
line.
3. The pressure of gas metering valve is too
low
Check whether the pressure reducer
solenoid valve and gas pipeline are
smooth.
4. The electronic throttle is in fault
Check or replace the electronic throttle
valve.
3. The exhaust
pipe blasts
The blasting is mainly caused by the
secondary combustion of unburned gas in
exhaust pipe.
1. One or more cylinders do not work (for
example: ignition coil is broken; the wires
in ignition coils of some cylinders are
exchanged by mistake; the spark plug does
not work properly, etc.)
Check the spark plug 、 ignition coil and
wiring harness.