Centinel System – Repair Manual – 003-002   Crankcase Breather (Internal)

• Remove the breather tube.
  Refer to Procedure 003-001 (Crankcase Breather (External)) in Section 3.
• Inspect the breather tube for sludge or debris on or in the tube.

NOTE: Inspect the tube more frequently in icy conditions.

Remove the breather tube assembly from the seal carrier.

Remove the breather oil seal (1) from the upper gear cover.

Remove the upper gear cover.

Refer to Procedure 001-079 (Gear Cover, Upper) in Section 1.

Remove the four capscrews from the crankcase breather and remove the breather.

Clean and inspect the crankcase breather for reuse.

If the filter element is plugged, replace the filter element.

Make sure the spacer and cam gear have been torqued.
Refer to Procedure 002-024 (Overhead Camshaft, Valve) in Section 2.

Position the crankcase breather over the spacer.

Pre-start the four crankcase breather capscrews.

Torque the capscrews in a crisscross pattern.

Lubricate the breather shaft with clean engine oil.

Install the upper gear cover.
Refer to Procedure 001-079 (Gear Cover, Upper) in Section 1.

Install the oil seal into the seal carrier.

The groove side (1)
must be installed toward the engine.

Make sure the seal carrier is tight in the front cover. If not, tighten the seal carrier.

Install the breather tube assembly into the seal carrier. Torque to the breather tube assembly.

• Install the crankcase breather tube.
  Refer to Procedure 003-001 (Crankcase Breather (External)) in Section 3.

Operate the engine until it reaches normal operating temperature and check for leaks.