Kohler 3.5CFZ, 4CZ, 5CFZ, 6.5CZ Carburetor/Choke Lubrication, Carburetor Adjustments

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Carburetor/Choke Lubrication

The only maintenance required is to lubricate carburetor and choke linkage at the specified interval using white lithium grease or lubriplate.

Carburetor Adjustments

The carburetor is a single-barrel, horizontal design and uses an electric choke.

Lack of power usually indicates that the fuel mixture is too rich. An overrich mixture may also be caused by a clogged air intake (backfire flame arrestor)— check this before readjusting carburetor. Fuel mixture may be too lean if engine skips or backfires. Minor carburetor adjustment may be necessary to compensate for differences in altitude, fuel, and temperature.

1.With ENGINE STOPPED, turn fuel mixture screw in (clockwise) until it seats lightly. DO NOT

FORCE! Turn fuel mixture screw out 2 to 2 1/2 turns. See Figure 3-8.

2.Start engine and let it run at no load for about 5 minutes. Before making adjustments engine should be thoroughly warmed up running at governed speed, and connected to full load.

3.Turn low speed mixture screw in until engine instability (hunting) develops and then screw out until engine instability is again apparent. Turn screw back in until it is positioned halfway between the points of increasing stability. When properly adjusted, engine will operate with steady governor action.

4.To adjust the idle speed, run the generator set at no load. Push the throttle lever counterclockwise until it hits the idle speed screw. Holding the throttle lever against the screw, adjust the idle speed screw until unit runs at 55 Hz (3300 rpm) for 60 Hz models or 45 Hz (2700 rpm) for 50 Hz models.

NOTE

If engine runs poorly after adjusting carburetor and doing scheduled maintenance, return generator set to an authorized service dealer/distributor to have problem corrected.

WARNING

Fire.

Can cause severe injury or death.

Do not smoke or permit flame or spark to occur near fuel or fuel system.

A sudden flash fire can cause severe injury or death.

Do not smoke or permit flame or spark to occur near fuel system. Keep the compartment and generator set clean and free of debris to minimize chances of fire. Wipe up all spilled fuel and engine oil.

2

1

1-829

3

1-829

1. Governor Arm

3. Idle Speed Screw

2.Low Speed Mixture Screw

Figure 3-8. Fuel Mixture Adjustment

3-8 Scheduled Maintenance

TP-5695 12/93

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Contents Marine Generator Sets Models5CFZ 5CZCalifornia Proposition Table of Contents Safety Precautions and Instructions Carbon monoxide Can cause severe nausea, fainting, or death Carbon monoxide can cause severe nauseaSulfuric acid in batteries Can cause severe injury or death Sulfuric acid in batteries can cause severe injury orExplosive fuel vapors Can cause severe injury or death Explosive fuel vapors can cause severe injury orAccidental starting Can cause severe injury or death Accidental starting can cause severe injury orRotating parts Can cause severe injury or death Flying projectiles can cause severe injury or deathFire Can cause severe injury or death Sudden backfire can cause severe injury or deathSudden flash fire can cause severe injury or death Hazardous noise Can cause loss of hearing246242 Reference Material Pleasure CraftCommercial Vessels Additional ReferencesRoutine Service Parts Part Description Kohler Part NoGlossary of Abbreviations Abbreviation DescriptionNEC Specifications SpecificationsGeneral Specifications IntroductionGenerator 5CFZ/4CZ 5CFZ/6.5CZEngine GX360EVBPR4HS NGK Accessories Service Views Service Views typicalOperation Prestart ChecksController ControllerStarting StoppingEngine Safety Shutdown Switches Circuit ProtectionHigh Water Temperature Shutdown Switch Remote Panel Features Remote Panels OptionalRemote Start and Four-Meter Features Remote Start and Four-Meter Panel KitScheduled Maintenance Service Schedule Or 2 YearsGenerator Specifications Lubrication SystemAdding Oil Oil Change/Oil Filter ChangeFuel System Removing Oil FilterFuel Pump Screen Fuel Pump ScreenCarburetor Adjustments Carburetor/Choke LubricationIgnition System Service Ignition SystemSpark Plugs Problem Means of Identification Possible Cause Normal Gap bridgedOil fouled Carbon fouled12. Checking Spark Plug Gap Cooling Systems- Closed/Heat Exchanger Filling and CheckingHot coolant and steam Can cause severe injury or death 14. Air-Bleed Screw Flushing and Cleaning TP-5695 12/93 Scheduled Maintenance Anticorrosion Zinc 17. Removing Anticorrosion ZincAir Cleaner Mixing Elbow Servicing Air CleanerPressure Cap Servicing Mixing ElbowBattery CleaningChecking Electrolyte Level Checking Specific Gravity21. Specific Gravity Temperature Correction ChargingValve Adjustment 22. Determining Top Dead Center Governor Adjustment GovernorLubrication Generator Service Wattage RequirementsGeneral Storage Procedure Troubleshooting EngineUnit cranks but will Not startProblem Possible Cause Corrective Action Stops suddenly Lacks powerOperates erratically Electrical System Generator Wiring Diagrams Schematic Wiring Diagram--3.5CFZ, 4CZ, 5CFZ, and 6.5CZDiagrams 4CZWire Generator Sets To Generator To Shore Set PowerTo Load LO Neutral Ground Load SideLine Side 60 HzL1--L3 Without Jumper LeadPage Installation Generator Selection and Wattage RequirementsMotor Loads Appliance Loads Kilowatt DeratingTypical Location and Mounting LocationVentilation SpaceMounting Air Requirements CFM L/min Model Combustion CoolingFuel Systems Fuel SupplyAnti-Siphon Provisions Fuel LinesFuel Pump Lift Capabilities Fuel Consumption Max. Lift ft. m In. mmCooling Systems 11. Intake StrainerClosed/Heat Exchanger 13. Seawater StrainerExhaust Systems 15. Closed/Heat Exchanger Cooling System17. Typical Above Waterline Installation Carbon monoxideAbove Waterline Mid/Below WaterlineInstallation in Steel or Aluminum Vessels Electrical SystemsAC Voltage Connections Battery WiringRemote Start Switch Connection Lead Designations Pin FunctionDimension Drawing--3.5CFZ, 4CZ, 5CFZ, and 6.5CZ SectionSound Shield--Optional on 3.5CFZ and 4CZ Standard on 5CFZ and 6.5CZFor Sales & Service in U.S.A. & Canada Phone Parts Ordering InstructionsOperating Hour Service Log Kohler CO. KOHLER, Wisconsin 53044 Phone