Do not install PCV Valves by shape alone as air flow varies from one valve to another. Identical outside does not mean identical inside. You may damage an engine by using a wrong PCV Valve. Information on PCV Valve application is provided by L DR according to data supplied by our manufacturers. L D R assumes no liability for misinformation or misapplication of PC V Valves. Check Vehicle Owner's Guide or Vehicle Manufacturer's Repair Manual for correct PCV Valve number.
ILLUSTRATIONS ARE NOT ACTUAL SIZE.
DIFFERENT COLORS & DIFFERENT SHADE GRADATIONS ARE NOT SHOWN. ILLUSTRATIONS INDICATE SHAPE ONLY.
PCV VALVES & BREATHERS
The PCV (Positive Crankcase Ventilation) valve helps control pollution from cars by returning crankcase fumes to the engine's intake manifold to be re-buried. Breather elements function similarly to air filters, filtering outside air into the PCV system. A clogged PCV valve or breather element causes heavy engine sludging, poor engine performance and stalling.
These are warning signs of a PCV system malfunction:
Excessive Oil Consumption: Excessive oil consumption can be caused by a clogged PCV breather element or a bad PCV valve.
Air Filter Contamination: If the PCV valve is clogged, crankcase pressure forces vapors up through the breather element. When this happens, oil residue is deposited in the air cleaner housing and eventually contaminates the air filter.
Excessive Oil Leakage: When both the valve and breather element become clogged, the crankcase is no longer vented to the atmosphere. This causes the crankcase pressure to increase and results in oil leakage at gasket surfaces.
Rough Engine Idle: A PCV valve that does not close properly will directly affect the air/fuel mixture supplied by the carburetor. This can result in a rough idle and hesitation.
For best engine performance, PCV valves and breather elements should be inspected regularly. Manufacturers recommend replacing the PCV valve every 15,000 miles and the breather element as needed. You may check each vehicle's owner manual for more information.
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