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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 clas-
sified 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 fol-
lowing 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 varia-
tion, 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 tester 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
CHECK IGNITION (ENGINE RuNNING):
If engine runs but misses during operation, a quick check
to determine 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.
SPARK
PLUG
LEAD
TESTER
Figure 1-10. Running Check
CHECK IGNITION (FOuLED PLuG OR OTHER CAuSES):
To check for a fouled spark plug or a non-functioning cyl-
inder, 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 cylinder 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.
1-4
SPARK PLUG
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