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Positive Crankcase Ventilation (PCV) system check and filter cleaning (Every 30 000 miles or 3 years)
Routine maintenance and servicing / Positive Crankcase Ventilation (PCV) system check and filter cleaning (Every 30 000 miles or 3 years)


1 The Positive Crankcase Ventilation (PCV) system components are located at the front of the engine, underneath the exhaust manifold and air intake resonator. Refer to Chapter 6 for further information.

2 Check that all components of the system are securely fastened, correctly routed (with no kinks or sharp bends to restrict flow) and in sound condition; renew any worn or damaged components.

3 If oil leakage is noted, disconnect the various hoses and pipes, and check that all are clear and unblocked. Remove the air cleaner assembly cover, air mass meter and resonator, then check that the hose from the cylinder head cover to the air cleaner housing is clear and undamaged. Disconnect the rubber T-piece both from the union on the inlet manifold left-hand end, and from the metal crankcase breather pipe under the ignition coil. Connect a spare, clean, length of hose to the breather pipe. Suck on the end of the hose, then blow through it - little or no restriction to airflow should be felt in either direction. A similar test can be applied to check that the inlet manifold passages are clear - air should be heard hissing out of the plenum chamber mouth as you blow.

4 The PCV valve is designed to allow gases to flow out of the crankcase only, so that a depression is created in the crankcase under most operating conditions, particularly at idle.

Therefore, if either the oil separator or the PCV valve are thought to be blocked, they must be renewed (see Chapter 6). In such a case, however, there is nothing to be lost by attempting to flush out the blockage using a suitable solvent. The PCV valve should rattle when shaken.

5 While the air filter element is removed (see Section 29), wipe out the housing, and withdraw the small foam filter from its location in the rear right-hand corner of the housing (see illustration). If the foam is badly clogged with dirt or oil, it must be cleaned by soaking it in a suitable solvent, and allowed to dry before being refitted.

30.5 The Positive Crankcase Ventilation (PCV) system filter in the air
30.5 The Positive Crankcase Ventilation (PCV) system filter in the air cleaner assembly must be cleaned whenever the air filter element is renewed


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