Kohler 18.5 CCOZ - User Manual

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Marine Generator Sets

Models:

13.5CCOZ/11CCFOZ

18.5 CCOZ/15CCFOZ

21CCOZ/16.5CCFOZ

18CCFOZ

14CCOZ/11.5CCFOZ

20CCOZ/17.5CCFOZ

24CCOZ/20CCFOZ

1 Phase

and 3 Phase

TP-5592 7/96a

Operation and

Installation Manual

Table of Contents

Questions and Answers:

J
John RobinsonSep 3, 2025
What should I do if my Kohler 18.5 CCOZ Inverter engine overheats?
- B
  Barbara MorganSep 3, 2025
  If your Kohler Inverter engine is overheating, check the engine coolant level to ensure adequate cooling. Other possible solutions include replacing a defective thermostat, servicing a clogged air intake silencer, reducing the engine load if it's overloaded, adjusting or replacing a loose or defective cooling water pump belt, flushing the cooling system, and replacing a defective temperature switch. Also, check the water passage for cooling water leaks.
M
Michelle HarringtonSep 1, 2025
Why is my Kohler Inverter engine lacking power?
- K
  Kelly ValentineSep 2, 2025
  If your Kohler Inverter engine lacks power, several factors could be responsible. Check for a clogged air intake (service air intake silencer), bad or stale fuel (replace fuel), a restricted fuel line (check fuel lines), a dirty fuel filter (service fuel filter), an overloaded engine (reduce load), or an obstructed vent in the fuel tank cap (clean cap in solvent and blow dry). Also, inspect the cooling system for inadequate cooling.
J
James HendrixAug 31, 2025
What causes a Kohler 18.5 CCOZ to stop suddenly?
- S
  Steve HudsonAug 31, 2025
  A Kohler Inverter might stop suddenly due to several reasons: * Being out of fuel (replenish fuel). * A clogged air intake (service air intake silencer). * A tripped circuit breaker in the controller (reset circuit breaker). * A defective seawater pump impeller (replace seawater pump impeller). * A clogged seawater strainer (clean strainer). * A fuel line restriction (check fuel lines and tank). * A dirty fuel filter (service fuel filter). It can also be caused by a defective low oil pressure (LOP) safety shutdown switch (replace LOP shutdown switch), high temperature shutdown (check engine coolant system for coolant level), or defective high exhaust temp. (HET) and/or high water temp. (HWT) safety shutdown switch(es) (replace HET and HWT shutdown switch(es)).
J
John EdwardsAug 29, 2025
Why does my Kohler Inverter engine start but not continue running?
- G
  ginaramosAug 29, 2025
  If your Kohler Inverter engine starts but doesn't continue to run after releasing the start switch, it could be due to no generator output voltage (check AC voltage), a defective low oil pressure (LOP) safety shutdown switch (replace it), or a high temperature shutdown (check coolant level). Also, consider defective high exhaust temp. (HET) and/or high water temp. (HWT) safety shutdown switch(es) and replace them if needed.
J
Jeremy HernandezAug 27, 2025
How do I troubleshoot a Kohler 18.5 CCOZ with no AC output?
- J
  James GarzaAug 27, 2025
  If your Kohler Inverter has no AC output, verify the following: * Ensure the circuit breaker is in the ON position; if it's OFF, reset it. * If the circuit breaker tripped due to an overload, reduce the load and reset the breaker. * Confirm the ship-to-shore transfer switch is set to generator power, not OFF or SHORE. * Check if the controller circuit breaker has tripped and reset it if necessary.
C
Courtney RasmussenAug 26, 2025
What to do if my Kohler 18.5 CCOZ cranks but won't start?
- M
  Mike HoffmanAug 27, 2025
  If your Kohler Inverter cranks but doesn't start, check these potential issues: * Make sure you're not out of fuel; if so, replenish it. * Check for any fault shutdowns and examine the shutdown switches. * Ensure the fuel shut-off valve is open. * Other possible causes include a defective fuel feed pump (replace it), a clogged fuel filter (service the filter element), or air in the fuel system (bleed the air). Also, consider water or dirt in the fuel system (drain and flush), incorrect fuel type (use the correct type), incorrect crankcase lube oil (use the correct lube oil), or a faulty fuel solenoid (replace it). Finally, check for a clogged air intake (clean or replace it), a faulty ground connection (clean and retighten), or a weak/dead battery (recharge or replace).
K
Katelyn HodgesAug 25, 2025
How to fix a Kohler 18.5 CCOZ Inverter that won't crank?
- T
  Tara GalvanAug 25, 2025
  If your Kohler Inverter won't crank, possible causes include a weak or dead battery (recharge or replace it), reversed or poor battery connections (check and correct them), a tripped circuit breaker in the controller (reset it), a defective start/stop switch (check and replace if necessary), a defective starter solenoid (check and replace if necessary), or a defective starter (replace/repair as necessary).
A
Allison SotoAug 22, 2025
What causes low output voltage on a Kohler 18.5 CCOZ Inverter?
- M
  michelewallaceAug 22, 2025
  If you're experiencing low output or an excessive voltage drop on your Kohler Inverter, try adjusting the governor if the engine speed is too low. If the generator is overloaded, reduce the load.

Kohler 18.5 CCOZ Specifications

General

Brand	Kohler
Model	18.5 CCOZ
Category	Inverter
Language	English

Summary

Safety Precautions and Instructions

Accidental Starting Safety

Details risks and precautions for preventing accidental generator start-up.

Battery Safety Precautions

Fire and Explosion Hazards

Exhaust System Hazards

Fuel System Safety

Noise and Electrical Hazards

Mechanical and Thermal Hazards

Moving Parts Safety

Service Assistance

Obtaining Sales and Service

Section 1: Specifications

Engine Specifications

Section 2: Operation

Prestart Checklist and Exercising

A step-by-step list of checks to perform before starting and exercising the generator.

Starting and Stopping Procedures

Detailed steps for safely starting and stopping the generator set.

Circuit Protection and Safety Shutdowns

Explains circuit breakers, fuses, and engine safety shutdown switches.

Section 3: Scheduled Maintenance

General Maintenance Guidelines

Covers general safety, servicing, and operational advice for maintenance.

Service Schedule

A comprehensive table outlining service tasks at various intervals.

Lubrication System Maintenance

Fuel System Maintenance

Cooling System Maintenance

Battery Maintenance

Section 4: Troubleshooting

Engine Troubleshooting

Lists common engine problems, possible causes, and corrective actions.

Electrical System Troubleshooting

Addresses issues with battery charging, starter operation, and output voltage.

Generator Troubleshooting

Covers problems related to AC output, voltage drop, and high output voltage.

Section 5: Wiring Diagrams

4-Lead Generator Reconnection

Illustrates voltage reconnection procedures for 4-lead generator sets.

12-Lead Generator Reconnection

Details the procedure for voltage reconnections on 12-lead generator sets.

Generator Reconnection Schematics

Schematic and Point-to-Point Diagrams

Section 6: Installation

Installation Introduction and Guidelines

Covers general advice, safety, and planning considerations for installing marine generator sets.

Typical Location and Mounting

Illustrates typical placement and mounting of the generator set on a vessel.

Location, Space, and Mounting Considerations

Guides on selecting the optimal location, ensuring adequate space, and proper mounting techniques.

Ventilation Requirements

Details essential ventilation provisions for engine combustion, cooling, and fume expulsion.

Fuel System Installation

Fuel Lines, Filters, and Pump Capabilities

Cooling System Components

Seawater Strainer and Waterline Connections

Closed;Heat Exchanger Cooling System

Exhaust System Installation General

Above Waterline Exhaust Installation

Mid;Below Waterline Exhaust Installation

Electrical System Connections

Battery Installation Requirements

Wiring Practices

Remote Start Switch Connection

Section 7: Installation Drawings

Appendix A: Generator Selection and Wattage Requirements

Calculating Wattage Requirements

Guides on determining total wattage needs for lights, motors, and appliances.

Motor Load Considerations

Appliance and Air Conditioner Loads

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