Kohler 6VSG Service Manual page 59

Problem Possible Cause
Starts hard Low battery voltage Check battery voltage during
Air cleaner clogged Check for a dirty air cleaner
Fuel mixture
adjustment
incorrect
Spark plug(s)
Spark plug wire(s)
Ignition
components (spark
control or ignition
module)
Insufficient fuel
pressure
Output Shorted
Engine problem
Noisy Exhaust system
operation leaks
Engine not running
smoothly
Broken or
damaged
vibromount(s)
Loose or vibrating
sheet metal/
housing
Exhaust piping or
air inlets/outlets not
securely installed
Excessive
engine/generator
vibration
High engine speed
Overheats Inadequate cooling
Air cleaner clogged Check for a dirty air cleaner
W/D = Wiring Diagram(s) (Section 7)
I/M = Generator Set Installation Manual
S/S = Generator Set Specification Sheet
TP-6844 1/13
Test
cranking.
Check battery charger
connections and power
connection to the generator set.
element.
Use oxygen sensor to check fuel
mixture.
Check spark plug condition and
gap.
Check spark plug wires and
connections.
Test ignition components
according to instructions in the
engine service manual.
Check fuel pressure to the
generator set. Verify adequate
fuel pressure and pipe size for the
generator set plus all other gas.
Check wiring and load.
Troubleshoot the engine.
Check silencer and connections
for leaks.
See "Erratic operation," this table.
Inspect vibromounts.
Check for loose screws and rivets. Retighten screws; replace rivets.
Inspect for loose parts.
Check rotor, crankshaft, bearing,
etc. (disassembly of engine and/or
alternator may be required).
Check settings.
Inspect engine and enclosure for
air intake obstructions.
element.
Engine S/M = Engine Service Manual
O/M = Generator Set Operation Manual
Corrective Action
Charge battery. Replace battery if
necessary.
Tighten loose connections.
Replace element.
Adjust fuel mixture.
Replace or regap spark plug(s).
Tighten connections. Replace
spark plug wires if damaged.
Replace ignition components if
necessary.
Contact fuel supplier to replace
fuel supply lines with larger pipe
and replace gas meter if fuel
pressure is insufficient.
Remove short circuit.
See engine service manual.
Replace gaskets and exhaust
system components as necessary.
See "Erratic operation," this table.
Replace as necessary.
Secure loose parts as necessary.
Check, rotor, crankshaft, bearing,
etc. (disassembly of engine and/or
alternator may be required).
Return to factory settings.
Clear any air intake obstructions.
Replace air cleaner element.
Section 4 Troubleshooting
Reference
O/M
W/D Section 7
O/M
Section 5.8
O/M
Engine S/M
Engine S/M
Section 5.8.2
Engine S/M
—
—
Section 6
—
—
Section 6
Engine S/M
O/M
O/M
59