C12 Marine Engines Caterpillar

Ensure that all safety information, warnings, and instructions are read and understood before any operation or any maintenance procedures are performed.

The user is responsible for the performance of all maintenance which includes the following items: performing all adjustments , using proper lubricants, fluids, and filters and replacing old components with new components due to normal wear and aging .

Failure to adhere to proper maintenance intervals and procedures may result in diminished performance of the product and/or accelerated wear of components.

Before each consecutive interval is performed, all maintenance from the previous intervals must be performed.

Choose the interval that occurs first in order to determine the correct maintenance interval: fuel consumption , service hours and calendar time . Products that operate in severe operating conditions may require more frequent maintenance.

All of the following will affect the oil change interval: operating conditions , fuel type , oil type and size of the oil sump . Scheduled oil sampling analyzes used oil in order to determine if the oil change interval is suitable for your specific engine.

Refer to this Operation and Maintenance Manual , "Engine Oil and Filter - Change" in order to determine the oil change interval that is suitable for your specific engine.

To determine the maintenance intervals for the overhauls, refer to this Operation and Maintenance Manual , "Maintenance Recommendations" .

When Required

Battery - Replace
Battery or Battery Cable - Disconnect
Engine - Clean
Engine Oil Level Gauge - Calibrate
Engine Storage Procedure - Check
Fuel System - Prime
Heat Exchanger - Inspect/Clean
Maintenance Recommendations
Sea Water Strainer - Clean/Inspect
Zinc Rods - Inspect/Replace

Daily

Closed Crankcase Ventilation (CCV) Filter Service Indicator - Inspect
Cooling System Coolant Level - Check
Engine Air Cleaner Service Indicator - Inspect
Engine Oil Level - Check
Fuel System Primary Filter/Water Separator - Drain
Walk-Around Inspection

Initial 20 to 40 Service Hours

Belts - Inspect/Adjust/Replace

Every 50 Service Hours or Weekly

Aftercooler Condensate Drain Valve - Inspect/Clean
Sea Water Strainer - Clean/Inspect
Zinc Rods - Inspect/Replace

Every 250 Service Hours

Cooling System Coolant Sample (Level 1) - Obtain

Initial 500 Hours (for New Systems, Refilled Systems, and Converted Systems)

Cooling System Coolant Sample (Level 2) - Obtain

Every Year

Cooling System Coolant Sample (Level 2) - Obtain

Every 6000 Service Hours or 3 Years

Cooling System Coolant Extender (ELC) - Add

Every 6 Years

Aftercooler Core - Replace

Every 12 000 Service Hours or 6 Years

Cooling System Coolant (ELC) - Change

First 12 750 L (3375 US gal) of Fuel or 250 Service Hours

Engine Valve Lash - Inspect/Adjust
Engine Valve Rotators - Inspect
Fuel Injector - Inspect/Adjust

Every 12 750 L (3375 US gal) of Fuel or 250 Service Hours or Yearly

Auxiliary Water Pump (Rubber Impeller) - Inspect/Replace
Battery Electrolyte Level - Check
Belts - Inspect/Adjust/Replace
Cooling System Supplemental Coolant Additive (SCA) - Test/Add
Engine - Clean
Engine Air Cleaner Element - Clean/Replace
Engine Crankcase Breather - Clean
Engine Oil Sample - Obtain
Engine Oil and Filter - Change
Fuel System Primary Filter (Water Separator) Element - Replace
Fuel System Secondary Filter - Replace
Fuel Tank Water and Sediment - Drain
Hoses and Clamps - Inspect/Replace
Marine Transmission Oil Cooler - Clean/Inspect

Every 36 900 L (9750 US gal) of Fuel or 750 Service Hours

Closed Crankcase Ventilation (CCV) Fumes Disposal Filter - Replace

Every 49 210 L (13 000 US gal) of Fuel or 1000 Service Hours or 2 Years

Aftercooler Core - Clean/Test
Engine Valve Lash - Inspect/Adjust
Engine Valve Rotators - Inspect
Fuel Injector - Inspect/Adjust
Heat Exchanger - Inspect/Clean
Turbocharger - Inspect/Clean

Every 147 630 L (39 000 US gal) of Fuel or 3000 Service Hours or 3 Years

Auxiliary Water Pump (Bronze Impeller) - Inspect/Replace
Cooling System Coolant (DEAC) - Change
Cooling System Water Temperature Regulator - Replace
Crankshaft Vibration Damper - Inspect
Engine Mounts - Inspect
Engine Speed/Timing Sensor - Clean/Inspect

Every 246 050 L (65 000 US gal) of Fuel or 5000 Service Hours or 5 Years

Alternator - Inspect
Starting Motor - Inspect
Water Pump - Inspect

Every 378 540 L (100 000 US gal) of Fuel or 8500 Service Hours

Maintenance Recommendations
Overhaul (Major)