Kohler 3.5CFZ, 4CZ, 5CFZ, 6.5CZ Operating And Installation Manual page 54

Problem
Stops suddenly Stops suddenly
Lacks power Lacks power
Operates erratically Operates erratically
4-2 Troubleshooting
Engine (Continued)
Possible Cause
Out of fuel
Air intake clogged
Fuse blown in controller
Defective seawater pump impeller
Clogged seawater strainer
Ignition coil failure
Fuel line restriction
Fuel vapor lock
Defective electric fuel pump
Dirty fuel screen
Faulty spark plug(s)
No/low oil pressure
Defective low oil pressure (LOP) safety
shutdown switch
High temperature shutdown
Defective high exhaust temp. (HET) and/or
high water temp. (HWT) safety shutdown
switch(es)
Loss of AC output
Faulty antidieseling solenoid
Air intake clogged
Bad or stale fuel
Faulty spark plug(s)
Improper timing
Choke solenoid defective
Engine not operating at rated RPM
Governor adjustments incorrect
Carbon build-up
Improper cooling
Dirty fuel screen
Defective ignition coil
Fuel line restricted
Engine overloaded
Carburetor adjustment wrong
Air intake clogged
Stale or bad fuel
Fuel pump vapor lock
Clogged fuel screen
Faulty spark plug(s)
Carburetor adjustment incorrect
Corrective Action
Replenish
Clean
Replace fuse
Replace
Clean strainer
Check for spark
Check fuel lines and tank
Check fuel line routing
Check pump
Clean fuel screen
Replace spark plug(s)
Check oil pressure and pump
Check LOP shutdown switch
Check engine coolant system
Check HET and HWT shutdown switch(es)
See authorized Kohler service
dealer/distributor
Replace solenoid
Clean
Replace fuel
Replace (and regap) plug(s)
Check timing
Check and/or change
Check governor
Adjust governor
Clean carbon from cylinder heads
Inspect cooling system
Clean screen
Replace coil
Check fuel lines
Reduce load
Adjust carburetor
Clean
Replace fuel
Allow unit to cool and attempt restart
Clean screen
Replace spark plug(s)
Adjust carburetor
TP-5695 12/93