Centinel System – Repair Manual – 003-001   Crankcase Breather (External)

Remove the breather tube and rubber grommet from engine.

Remove the four p-clips securing the hose to the front cover and block.

Disassemble the breather tube.

Disconnect the wiring connector from the breather pressure sensor.

Loosen the two hose clamps on the inlet hose.

Disconnect hose from breather. Loosen outlet hose clamp.

Disconnect the outlet hose.

Disconnect the breather oil drain line.

Remove the drain line inline with the connection nipple, do not bend.

Remove the four mounting capscrews from the crankcase breather element housing to the breather housing bracket and remove the housing assembly.

Disassemble the crankcase breather assembly. Refer to Procedure
003-019.

NOTE: All capscrews are captive capscrews.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Use solvent to clean the inside of the crankcase breather tube, and dry with compressed air.

Use air pressure to blow through the vent tube.

Replace the vent tube if it is clogged.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Do
not use solvent to clean the rubber grommet.

Clean the rubber grommet with soapy water. Dry with compressed air.

Inspect the breather tube, hose and rubber grommet for cracks or other damage. Replace if necessary.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean breather crankcase housing and breather crankcase cover with solvent.

Dry with compressed air.

Check for cracks in crankcase breather element housing and crankcase breather cover. Replace if necessary.

Assemble the crankcase breather assembly. Refer to Procedure
003-019.

Assemble the breather tube as shown.

Two p-clips attach the vent hose to the gear housing and two p-clips attach the vent hose to the side of the block. With the breather hose installed on the new cover, the hose (3)
must extend lower than the flywheel housing.

Install the crankcase vent hose (1). Use the four p-clips (2), to secure the crankcase vent hose to the engine.

Connect the inlet and outlet rubber hoses, oil drain line, and install the three hose clamps to the housing. Be sure to push the hose on until it stops on the housing connector. Verify that the hose clears the fan blade.

Connect the breather sensor wiring connector to the breather sensor.

Install and tighten the four mounting capscrews.

Remove and install the crankcase pressure sensor. Refer to Procedure 019-445 in the Troubleshooting and Repair CM871 and CM876 Electronic Control System, ISX and ISM Engines, Bulletin
4021560.