ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 003-020   Closed-Crankcase Ventilation System Filter

This procedure applies to Marine Applications only.

The closed-crankcase system has three major parts.

1. The air cleaner assembly (filters the incoming air) and a oil blow-by filter element called a coalescing filter.
2. Vacuum brake assembly; this keeps the engine from drawing oil directly into the turbocharger if the air cleaner is plugged.
3. Closed-crankcase drain plumbing; this includes the drain hoses and check valve. The check valve prevents crankcase pressure from flowing backwards in the air cleaner.

This procedure covers the closed-crankcase ventilation system filter only. Refer to Procedure 010-013 for instructions on removing, cleaning and inspecting, and installing other components of the complete assembly.

Check the restriction gauge on the air filter assembly. If the gauge is red, the air filter element must be cleaned or replaced. Refer to Procedure 010-013.

Remove the air filter. Refer to Procedure 010-013.

Remove the o-ring from the closed-crankcase breather element assembly.

Use a screwdriver in the notches around the element to break the seal and remove the element.

Remove the element from the canister.

NOTE: The filter will normally be oil soaked. Look for buildup of moisture condensation, sludge, or blockage of the element. Replace the element if it is dirty and oil soaked.

Use a clean rag to wipe the inside of the canister clean.

Inspect the canister for damage.

Inspect the o-rings for cuts or other damage.

The top of the filter is marked with “TOP” on the outer rim.

Install the clean filter into the canister.

Install the o-ring.

Install the air filter. Refer to Procedure 010-013.

Operate the engine and check for leaks.