740 L4-2320cc 2.3L DOHC B234F (Can) (1992)
Positive Crankcase Ventilation: Service and Repair
Crankcase Ventilation, Checking/Overhaul
Blocked flame trap/ventilation system
Blockage of the flame trap may be caused by:
- excessive interval between engine oil changes
- use of inferior grade engine oil
- excessive interval between flame trap services
Flame trap blockage restricts crankcase ventilation and increases crankcase pressure.
Symptoms of flame trap blockage:
- Oil dipstick tends to lift in tube.
- Oil leakage from cylinder block seals. Seals do not always require renewal if leakage is due to this cause. Overhaul flame trap, clean engine and
reinspect for seal leakage.
- Engine knocks.
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Flame trap, inspection
Remove oil trap T-piece
Disconnect hoses from intake manifold and air inlet hose.
Disconnect bottom T-piece hose from oil trap.
Inspect flame trap
Disconnect hoses from T-piece.
Cut tie around top T-piece hose.