Positive Crankcase Ventilation: Testing and Inspection

The integrity of the PCV system is critical to the proper functioning of the fuel system. Before making major adjustments or replacing components in the fuel system check the PCV system for:
1. Loose hose connections
2. Missing hose clamps
3. Condition of hoses (brittle, cracked, oil soaked, collapsed, etc.)
4. Blocked passages

Any hose or fitting found to be weak, collapsed or broken should be replaced with an approved fuel/fuel-vapor type hose. Any other type of hose material is not suitable for PCV system use.

Crankcase Housing Breather Hoses:

If necessary, check the calibrated orifice #4 and inside of the crankcase breather area #3 where the PCV hoses are for sludge build-up that could interfere with crankcase vapor return. Should this area become clogged, high crankcase pressure would result and cause abnormal amounts of oil leakage from some or all engine gaskets and seals. Clean or replace as necessary.