Kohler 3.5EFOZ User Manual (English)

Other manuals for Kohler 3.5EFOZ

Questions and Answers:

H
hernandezheatherAug 21, 2025
How to troubleshoot a Kohler Marine Equipment that will not crank?
- D
  Dylan RamosAug 21, 2025
  If your Kohler Marine Equipment won't crank, it might be due to a weak or dead battery. Try recharging or replacing the battery. Also, check for reversed or poor battery connections, ensuring a good ground. Inspect the circuit breaker in the controller and reset it if it has tripped. Check the function of the start/stop switch, and replace if necessary. Similarly, examine the starter solenoid and wiring, replacing if needed. As a last resort, attempt starting by direct connection to the battery; repair or replace the starter if it's inoperative.
C
Carrie MullinsAug 22, 2025
What to do if Kohler 3.5EFOZ Marine Equipment engine starts but does not continue to run?
- T
  Travis ByrdAug 23, 2025
  If your Kohler Marine Equipment engine starts but doesn't continue to run after releasing the start switch, check the high exhaust temperature (HET), low oil pressure (LOP), and/or high water temperature (HWT) shutdown switches. Also, check the oil pressure and pump, and verify the AC voltage.
T
Tonya HuberAug 25, 2025
Why does my Kohler 3.5EFOZ overheat?
- C
  Carolyn JonesAug 25, 2025
  If your Kohler Marine Equipment overheats, start by checking the intake and outlet openings and the raw water strainer to ensure proper cooling. Replace the thermostat if it's inoperative. Service the air intake screen if it's clogged. Reduce the load if the engine is overloaded. Flush the cooling system if it needs cleaning. Replace any inoperative temperature switches. Finally, inspect the water passage for any cooling water leaks.
M
michaelwilliamsAug 26, 2025
What to do if Kohler Marine Equipment cranks but will not start?
- D
  David OnealAug 27, 2025
  If your Kohler Marine Equipment cranks but will not start, first check the shutdown switches. Ensure you have enough fuel by replenishing the fuel supply and opening the fuel shut-off valve if it's closed. Replace the fuel feed pump if it's inoperative. Service the fuel filter element if it's clogged, and bleed the air from the fuel system. If there is water or dirt in the fuel system, drain and flush it. Also, check the battery, recharge or replace if weak or dead. Clean and retighten the faulty ground connection. Clean or replace the air intake screen, if clogged.
E
Erika GreenAug 28, 2025
Why is my Kohler 3.5EFOZ losing power?
- J
  Jennifer ThompsonAug 28, 2025
  If your Kohler Marine Equipment is losing power, service the air intake screen if it's clogged, and replace the fuel if it's bad or stale. Check the governor and adjust it if the engine is not operating at the rated RPM or if the governor adjustments are incorrect. Clean the carbon from the cylinder head if there's a carbon build-up. Inspect the cooling system to ensure proper cooling. Check the fuel lines for any restrictions. Reduce the load if the engine is overloaded. Service the fuel filter if it's dirty, and clean the cap in solvent and blow it dry if the vent in the fuel tank is obstructed.
S
Sandra CookAug 29, 2025
What causes a Kohler 3.5EFOZ Marine Equipment to stop suddenly?
- J
  Jeffrey AndersonAug 29, 2025
  If your Kohler Marine Equipment stops suddenly, replenish the fuel supply if it's out of fuel and service the air intake screen if it's clogged. Reset the circuit breaker if it has tripped in the controller. Replace the seawater pump impeller if it's inoperative, and clean the seawater strainer if it's clogged. Check the fuel lines and the fuel tank for any restrictions. Clean the fuel filter if it's dirty. Check the oil pressure and pump if there's no or low oil pressure. Check the engine cooling system if there's high temperature. Check the HET, LOP, and HWT shutdown switches if they are inoperative.
G
gallowaypatriciaAug 31, 2025
Why does my Kohler Marine Equipment operate erratically?
- A
  Alyssa JacksonAug 31, 2025
  If your Kohler Marine Equipment operates erratically, service the air intake screen if it's clogged and replace the fuel if it's stale or bad. Service the fuel filter if it's clogged, and clean the cap in solvent and blow it dry if the vent in the fuel tank cap is obstructed. Drain, flush, fill, and bleed air in the system if there's water, dirt, or air in the fuel system. Replace the fuel feed pump if it's inoperative.
P
Philip TurnerSep 2, 2025
How to fix Kohler 3.5EFOZ Marine Equipment battery that will not charge?
- G
  Gregory Adams Jr.Sep 2, 2025
  If the battery of your Kohler Marine Equipment will not charge, clean and tighten loose or corroded connections. Check the electrolyte level and specific gravity of sulfated or worn battery connections (only batteries with filler caps). Check the charging system.
L
Lacey ChanSep 4, 2025
Why does Kohler 3.5EFOZ emit black or gray exhaust smoke?
- L
  Lisa HowellSep 4, 2025
  If your Kohler Marine Equipment engine emits black or gray exhaust smoke, use the correct fuel. Service the air intake screen if it's clogged or dirty. Drain out surplus if the lube oil level is too high. Use the correct viscosity oil if the lube oil is incorrect.
J
Jesse SandersSep 5, 2025
How to reduce noise from a Kohler 3.5EFOZ Marine Equipment unit?
- J
  Joseph ByrdSep 5, 2025
  If your Kohler Marine Equipment is noisy, check the exhaust system for leaks and ensure it's securely installed, looking for loose parts. Inspect the vibromounts for any breaks or damage. Check the clearance to ensure the unit isn't hitting the craft structure or compartment. Install approved insulation if there's no compartment sound insulation. Tighten all bolts if there's loose or vibrating sheet metal.

Kohler 3.5EFOZ Specifications

General

Brand	Kohler
Model	3.5EFOZ
Category	Marine Equipment
Language	English

Summary

Product Identification Information

Generator Set Identification Numbers

Record product identification numbers from the generator set nameplate(s).

Engine Identification

Record product identification information from the engine nameplate.

Section 1 Specifications

1.1 General

Covers operation, maintenance, troubleshooting, and repair of AC marine generator sets.

1.2 Generator

Details generator models, dimensions, weight, air requirements, fuel consumption, and electrical specs.

1.3 Service Views

Illustrates service-side and engine-end views with component identification.

1.4 Engine

Lists engine specifications including manufacturer, bore, displacement, horsepower, and oil capacity.

1.5 Torque Specifications

Provides torque values for various engine and generator components in Nm and ft. lbs.

Section 2 Operation

2.1 Prestart Checklist

Outlines essential checks before starting the generator set for continued satisfactory operation.

2.2 Marine Inspection

Recommends seasonal inspection by Coast Guard Auxiliary or authorized dealer for safety.

2.3 Angular Operation

Specifies angular operation limits for units, illustrated with a chart.

2.4 Operation in European Union Member Countries

Notes specific approval for below-deck operation, complying with EU noise standards.

2.5 Exercising the Generator Set

Advises weekly operation under load for one hour with an operator present.

2.6 Starting and Stopping Procedure

Details the steps for starting and stopping the generator set, including important notes.

Section 3 Scheduled Maintenance

3.1 General

Provides general maintenance guidelines, safety precautions, and service intervals.

3.2 Service Schedule—3.5EFOZ and 4EOZ Models

Presents a detailed service schedule based on hours or months for various systems.

3.3 Lubrication System

Covers oil specifications, checking oil levels, and procedures for oil changes.

3.4 Battery

Discusses battery care, handling sulfuric acid, and precautions against explosion.

3.5 Generator Storage Procedure

Outlines procedures for storing the generator set for three months or longer.

Section 4 Intake and Exhaust System

4.1 Air Intake Silencer/Filter

Instructions for cleaning and replacing the air intake screen and silencer assembly.

4.2 Exhaust System

Details inspection points for the exhaust system, focusing on carbon monoxide hazards.

4.3 Mixing Elbow

Describes checking the mixing elbow for carbon buildup and corrosion to prevent exhaust leaks.

Introduction

Service Assistance

Contact Kohler distributors for professional advice and service support.

Section 5 Fuel System

5.1 General

Covers general fuel system safety, description of operation, and installation notes.

5.2 Fuel Specifications

Specifies diesel fuel quality requirements and precautions for storage and handling.

5.3 Fuel Filter

Explains the function of the fuel filter and provides cleaning/replacement procedures.

5.4 Fuel Injector Nozzle

Details injector cleaning, pressure testing, and adjustment procedures.

5.5 Excess Fuel Start Device

Explains the function of the device used to facilitate engine starting.

5.6 The Injection Pump’s Fuel Starting Delivery Point

Describes how to adjust the fuel starting delivery point for proper engine operation.

5.7 Fuel Pump Adjustment Timing

Details how to obtain correct fuel pump adjustment timing using flywheel and crankcase marks.

5.8 Fuel Pump and Gear Cover Installation

Provides instructions for installing fuel pump and gear cover, including distance measurements.

5.9 Bleeding the Fuel System

Outlines the procedure to remove air from the fuel system to prevent starting issues.

5.10 Governor

Explains the governor's function in maintaining engine speed and its construction.

Section 6 Cooling System

6.1 Direct Water Cooled

Describes the direct seawater cooling system, impeller pump, and thermostat function.

6.2 Thermostat

Details thermostat settings and its role in controlling cooling water circuit temperature.

6.3 Seawater Pump and Impeller

Provides procedures for inspecting and replacing the seawater pump impeller.

6.4 Siphon Break

Explains the function of the siphon break and inspection procedures.

6.5 Anticorrosion Zinc Anode

Details the purpose and replacement procedure for the anticorrosion zinc anode.

Section 7 Troubleshooting

7.1 General

Provides guidance on simple troubleshooting steps and common problems with corrective actions.

Section 8 Controller Troubleshooting

8.1 General

Introduces controller troubleshooting procedures and identifies controller components.

8.2 Engine Safety Shutdown Switches

Explains the function of LOP, HET, and HCHT shutdown switches and their effect on engine operation.

8.3 Operation Sequence

Details the controller operation sequence for starting and stopping the generator set.

8.4 Troubleshooting

Provides flowcharts for troubleshooting main control panel and generator set issues.

Section 9 Generator Troubleshooting

9.1 General

Emphasizes safety precautions and outlines tests for generator troubleshooting.

9.2 Theory of Operation, Brushless Generator Sets

Explains the principles of operation for a two-pole, revolving-field alternator with capacitor excitation.

9.3 Output Voltage and Frequency.

Discusses output voltage and frequency specifications and factors affecting them.

9.4 Rotor Test

Outlines procedures for testing rotor insulation and continuity.

9.5 Field Diode Test

Details how to test rotor field diodes and varistors for proper function.

9.6 Stator Test

Covers testing stator insulation, continuity, and winding resistance.

9.7 Alternator Excitation

Explains the process of exciting the alternator after disassembly by applying 12 VDC.

Section 10 Generator and Engine Disassembly/Reassembly

10.1 Generator Alternator Disassembly

Provides instructions for disconnecting external connections and removing the generator alternator.

10.2 Generator Alternator Reassembly

Details the steps for reassembling the generator alternator, including torque values.

10.3 Generator Engine Disassembly

Covers unique engine disassembly procedures for the marine generator set.

10.4 Generator Engine Reassembly

Outlines the procedures for reassembling the generator engine components.

10.5 Engine Component Dimensions and Wear

Lists original and maximum limit dimensions for various engine components.

Section 11 Wiring Diagrams

11.1 Wiring Diagram, Schematic

Presents the schematic wiring diagram for the generator set control system.

11.2 Wiring Diagram, Point-to-Point

Shows the point-to-point wiring diagram for the generator set, illustrating connections.

Appendix A Abbreviations

Appendix B Common Hardware Application Guidelines

Appendix C General Torque Specifications

Appendix D Common Hardware Identification

Appendix E Common Hardware List

Related product manuals

Kohler 3.5EFOZ User Manual

Table of Contents

Other manuals for Kohler 3.5EFOZ

Questions and Answers:

Kohler 3.5EFOZ Specifications

Summary

Product Identification Information

Generator Set Identification Numbers

Engine Identification

Section 1 Specifications

1.1 General

1.2 Generator

1.3 Service Views

1.4 Engine

1.5 Torque Specifications

Section 2 Operation

2.1 Prestart Checklist

2.2 Marine Inspection

2.3 Angular Operation

2.4 Operation in European Union Member Countries

2.5 Exercising the Generator Set

2.6 Starting and Stopping Procedure

Section 3 Scheduled Maintenance

3.1 General

3.2 Service Schedule—3.5EFOZ and 4EOZ Models

3.3 Lubrication System

3.4 Battery

3.5 Generator Storage Procedure

Section 4 Intake and Exhaust System

4.1 Air Intake Silencer/Filter

4.2 Exhaust System

4.3 Mixing Elbow

Introduction

Service Assistance

Section 5 Fuel System

5.1 General

5.2 Fuel Specifications

5.3 Fuel Filter

5.4 Fuel Injector Nozzle

5.5 Excess Fuel Start Device

5.6 The Injection Pump’s Fuel Starting Delivery Point

5.7 Fuel Pump Adjustment Timing

5.8 Fuel Pump and Gear Cover Installation

5.9 Bleeding the Fuel System

5.10 Governor

Section 6 Cooling System

6.1 Direct Water Cooled

6.2 Thermostat

6.3 Seawater Pump and Impeller

6.4 Siphon Break

6.5 Anticorrosion Zinc Anode

Section 7 Troubleshooting

7.1 General

Section 8 Controller Troubleshooting

8.1 General

8.2 Engine Safety Shutdown Switches

8.3 Operation Sequence

8.4 Troubleshooting

Section 9 Generator Troubleshooting

9.1 General

9.2 Theory of Operation, Brushless Generator Sets

9.3 Output Voltage and Frequency.

9.4 Rotor Test

9.5 Field Diode Test

9.6 Stator Test

9.7 Alternator Excitation

Section 10 Generator and Engine Disassembly/Reassembly

10.1 Generator Alternator Disassembly

10.2 Generator Alternator Reassembly

10.3 Generator Engine Disassembly

10.4 Generator Engine Reassembly

10.5 Engine Component Dimensions and Wear

Section 11 Wiring Diagrams

11.1 Wiring Diagram, Schematic

11.2 Wiring Diagram, Point-to-Point

Appendix A Abbreviations

Appendix B Common Hardware Application Guidelines

Appendix C General Torque Specifications

Appendix D Common Hardware Identification

Appendix E Common Hardware List