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:

    Clock - removal and refitting
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    Removal 1 Disconnect the battery negative lead. 2 Disconnect the valve wiring plug (see illustration). 12.2 Idle speed control valve - 1.6 EFI engine A Wiring plug B Securing bolts 3 Unscrew t ...

    Engine idle speed check (Every 6000 miles (10 000 km) or 6 months)
    Caution: Refer to the precautions in Section 1, Chapter 4, Part A or B (as applicable), before proceeding. Before carrying out any carburettor adjustments, ensure that the ignition timing and sp ...