C12.9 Marine Engines Engine Oil and Filter - Change Caterpillar

Engine Oil and Filter - Change
C12.9 Marine Engines [SEBU9225]
C12.9 Marine Engines Engine Oil and Filter - Change
1.1. Drain the Engine Oil
2.1. Replace the Oil Filter
3.1. Fill the Engine Crankcase

Do not drain the oil when the engine is cold. As the oil cools, suspended waste particles settle on the bottom of the oil pan. The waste particles are not removed with the draining cold oil. Drain the crankcase with the engine stopped. Drain the crankcase with the oil warm. This draining method allows the waste particles that are suspended in the oil to be drained properly.

Failure to follow this recommended procedure will cause the waste particles to be recirculated through the engine lubrication system with the new oil.

Drain the Engine Oil

Illustration 1g03455346

After the engine has been run at the normal operating temperature, stop the engine. Attach a "DO NOT OPERATE" or a similar warning tag to the ignition keyswitch before the engine is serviced.


Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Cat Dealer Service Tool Catalog" or refer to Special Publication, PECJ0003, "Cat Shop Supplies and Tools Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.

Dispose of all fluids according to local regulations and mandates.

  1. Drain the oil using the oil drain plug (1) on the oil sump (2).

  2. After the oil has drained, secure the drain plug.

Replace the Oil Filter

Illustration 2g06011724
(1) Engine oil filters

Illustration 3g06011774
(2) Engine oil filter housing drain
(3) Engine oil filter housing
(4) O-ring
(5) Engine oil filter element


AVSpare oil filters are built to AVSpare specifications. Use of an oil filter not recommended by AVSpare could result in severe engine damage to the engine bearings, crankshaft, etc., as a result of the larger waste particles from unfiltered oil entering the engine lubricating system. Only use oil filters recommended by AVSpare.

  1. Connect a drain hose to the oil filter housing drain (2). Drain the oil into a suitable container.

  2. Unscrew the oil filter housing (3).

  3. Remove the oil filter element (5).

  4. Break apart the pleats and inspect the oil filter for metal debris. An excessive amount of metal debris in the oil filter may indicate early wear or a pending failure.

    Use a magnet to differentiate between the ferrous metals and the nonferrous metals that are found in the oil filter element. Ferrous metals may indicate wear on the steel and cast iron parts of the engine.

    Nonferrous metals may indicate wear on the aluminum parts, brass parts, or bronze parts of the engine. Parts that may be affected include the following items: main bearings, rod bearings, turbocharger bearings, and cylinder heads.

    Due to normal wear and friction, finding small amounts of debris in the oil filter is not uncommon. Consult your Cat dealer to arrange for a further analysis if an excessive amount of debris is found in the oil filter.

  5. Clean the sealing surface of the filter mounting base.

  6. Apply clean engine oil to the new oil filter element O-ring seal.

    Install the oil filter element.

  7. Inspect the oil filter housing o-ring. Replace the o-ring if damaged.

  8. Screw oil filter housing into the base.


    Do not fill the oil filters with oil before installing them. This oil would not be filtered and could be contaminated. Contaminated oil can cause accelerated wear to engine components or engine damage.

  9. Tighten the oil filter housing to 60 ± 5 N·m (44 ± 3.6 lb ft).

Fill the Engine Crankcase

  1. Remove the oil filler cap. Fill the crankcase with the proper amount of oil. Refer to the Operation and Maintenance Manual, "Refill Capacities" for the correct refill capacities. Refer to the Operation and Maintenance Manual, "Fluid Recommendations" for the correct oil.


    If equipped with an auxiliary oil filter or system, extra oil must be added when filling the crankcase. Follow the OEM or filter manufacturer's recommendations. If the extra oil is not added, the engine may starve for oil.


    To help prevent crankshaft or bearing damage, crank engine to fill all filters before starting. Do not crank engine for more than 30 seconds.

  2. Start the engine and run the engine at "LOW IDLE" for 2 minutes. Perform this procedure to ensure that the lubrication system has oil and that the oil filters are filled. Inspect the oil filter for oil leaks.

  3. Stop the engine and allow the oil to drain back to the sump for a minimum of 10 minutes.

  4. Remove the oil level gauge to check the oil level. Maintain the oil level between the "ADD/MIN" and "FULL/MAX" marks on the side of the oil level gauge.

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