Generac Power Systems GTH1000, Руководство по обслуживанию

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1-4
SECTION 1: GENERAL INFORMATION
Note: The air cleaner assemblies on some equipment may have
been supplied by the equipment manufacturer. See the equipment
manufacturer’s owner’s manual for service information specific
to that product.
TROUBLESHOOTING
Most complaints concerning engine operation can be classified as
one or a combination of the following:
1. Will not start
2. Hard starting
3. Lack of power
4. Runs rough
5. Vibration
6. Overheating
7. High oil consumption
Note: What appears to be an engine malfunction may be a fault
of the powered equipment rather than the engine. If equipment is
suspect, see equipment affecting engine operation.
SYSTEMATIC CHECK
If the engine will not start and the cause of malfunction is not readily
apparent, perform a systematic check in the following order:
1. Fuel
2. Ignition
3. Compression
This check-up, performed in a systematic manner, can usually be
done in a matter of minutes. It is the quickest and surest method of
determining the cause of failure. The basic checkup procedure is the
same for all engine models, while any variation, by model, will be
shown under the subject heading.
CHECK FUEL:
The fuel pressure on LP and NG generator engines can be checked
using a pressure test kit for LP and NG systems.
For gasoline engines, check the following:
1. Are the tanks full?
2. Is the fuel stale?
3. Is the tank vent open?
4. Is the fuel shutoff valve open?
5. Is the fuel pump working?
6. Is the fuel solenoid working?
CHECK IGNITION:
If spark does not occur look for:
• Shorted ignition/ground wire (see Page 2-1)
• Two closed diodes in ground wire harness (see Page 2-1)
• Incorrect ignition coil air gap (see Page 2-3)
• Ignition coil failure
• Weak flywheel magnet
CHECK IGNITION (ENGINE RUNNING):
If engine runs but misses during operation, a quick check to deter-
mine if ignition is or is not at fault can be made by installing a spark
tester (Generac P/N 0C5969) between the spark plug lead and each
spark plug, Figure 1-10. A spark miss will be readily apparent when
the engine is running. If spark is good but engine misses, check for
a fouled spark plug.
TESTER
SPARK
PLUG
LEAD
SPARK PLUG
Figure 1-10. Running Check
CHECK IGNITION (FOULED PLUG OR OTHER CAUSES):
To check for a fouled spark plug or a non-functioning cylinder, attach
the spark tester (Generac P/N 0C5969) between the spark plug lead
and each spark plug. Start and run engine at top no load speed. Now
ground one spark plug, Figure 1-11. The engine should continue to
run on the other cylinder. Repeat this test with the other cylinder. If
the engine will not continue to run when making this test, the cylin-
der that is NOT grounded is not functioning and/or the spark plug is
fouled. Install a new spark plug before proceeding. If miss continues,
problem may be carburetion or compression. See Check Fuel, Check
Compression, and Cylinder Balance Test.