Crankcase ventilation system check (Every 12 000 miles (20 000 km) or 12 months)

1 Inspect the crankcase ventilation system for blockage or damage. A blocked hose can cause a build-up of crankcase pressure, which in turn can cause oil leaks (see illustration).

35.1 Loosening the crankcase ventilation hose clip - CVH models
35.1 Loosening the crankcase ventilation hose clip - CVH models

2 On carburettor model SOHC engines, clean the oil filler cap with paraffin and check that the vent valve is not blocked by pulling it from the oil separator and loosening the hose clip (Section 42).

3 On CVH engines, check that the oil separator and mushroom valve are not blocked, and clean if necessary (see illustration).

35.3 Oil separator (1) and mushroom valve (2) locations in air cleaner - CVH
35.3 Oil separator (1) and mushroom valve (2) locations in air cleaner - CVH models

    See also:

    Ford VV carburettor manual choke unit - removal, checking and refitting
    Note: A new gasket will be required on refitting. Removal 1 Disconnect the battery negative lead. 2 Remove the air cleaner (Section 2). 3 Slacken the choke cable clamp bolt at the choke lever, d ...

    Valve clearance adjustment - OHV and HCS engines (Every 12 000 miles or 12 months)
    OHV engines 1 This operation should be carried out with the engine cold and the air cleaner and rocker cover removed. 2 Using a ring spanner or socket on the crankshaft pulley bolt, turn the cran ...

    Rear roadspring (Saloon and Estate models) - removal and refitting
    Removal 1 Raise the rear of the car and support it on stands (see “Jacking and Vehicle Support”). Remove the roadwheel. 2 Support the suspension lower arm by placing a jack beneath the spring sea ...