C12 Marine Engines Caterpillar

Illustration 1	g00585620
Typical example of the Closed Crankcase Ventilation system (CCV) (1) Crankcase breather (2) Fumes disposal filter base and fumes disposal filter (3) Air cleaner

The Closed Crankcase Ventilation system (CCV) requires the replacement of the fumes disposal filter. The service interval of the CCV will be affected by the following items:

• Engine load

• Soot concentration

• Condition of the engine

The CCV is equipped with a service indicator. If the fumes disposal filter becomes plugged prior to the normal service interval, increased restriction of the filter will cause the vacuum to become positive. When the pressure continues to rise, the service indicator will show through the cap. The service indicator indicates the need for the fumes disposal filter to be changed. Reset the service indicator by using the following procedure:

Resetting the Service Indicator

Show/hide table

Illustration 2	g00585674

1. Remove the plastic cover (4).

2. Push down on the service indicator (5).

3. Replace the cover (4).

4. Replace the fumes disposal filter by using the following procedure:

Replacing the Fumes Disposal Filter

Show/hide table

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.

Note: When possible, perform the maintenance while the engine is off.

Show/hide table

Illustration 3	g00585616

1. Release the latches (7) that hold the canister to the filter base assembly (6).

   Note: The canister (8) may be difficult to remove while the engine is operating. The canister has negative air pressure while the engine is operating. This creates a vacuum.

2. Lower the canister (8) in order to expose the element. There may be oil in the bottom of the canister. Avoid spilling the oil.

3. Remove the filter element by pulling down. Dispose of the used element properly.

4. Remove the O-ring assembly on the top end cap of the used element.

5. Replace the O-ring seal on the bottom of the filter base assembly.

6. Install the new O-ring on the top end cap of the element. Install the element into the correct place.

7. Replace the canister (8) and align the canister with the boss on the filter base assembly (6).

8. Clamp the latches (7) in the closed position.