Blow-By System - Alfa Romeo 159 Training Material

ENGINE
Oil filter
1. Oil filter housing
2. Oil filter cover
3. Filtering cartridge
LOCATION: The oil filter housing is made in the cylinder block casting.
FEATURES: The oil filter consists of a paper cartridge. The screw-on filter cartridge contains the bypass filter.
MAINTENANCE: Use the specific tool to remove the oil filter cover. Change the engine oil regularly as shown in the
Owner's Handbook.

Blow-by system

FUNCTION: To collect the oil vapours developed in the crankcase and cylinder head to prevent dispersion outside
the engine, to condense them and send them back to the sump.
FEATURES: Vapour emissions are controlled by an oil separator which collects the vapours from the crankcase and
the tappet cover. The condensed vapours return to the sump through a pipe. The uncondensed vapours are
conveyed by a pipe to the suction air sleeve.
BLOW-BY VALVE: A regulating valve is arranged on the vapour conveying pipe. In normal conditions, the valve
spring presses a membrane keeping it open and letting oil vapours from the oil separator through. When the vacuum
inside the pipe exceeds its calibration, the spring moves the membrane and closes the conduit from the oil separator
consequently preventing the access of oil into the sump.
1. Blow-by valve
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
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