Blowby Gas Reburning System - Yamaha F2.5A Service Manual

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Blowby gas reburning system

The splash lubrication system splashes a large quantity of oil into the blowby gases. Therefore, a
reburning system is incorporated to separate the oil from the blowby gases in two stages: first in the
cylinder head and second in the intake silencer.
Oil is first separated from the blowby gases in the cylinder head labyrinth. The oil flows into the cyl-
inder head and the gases are discharged into the intake silencer.
Blowby gases from the cylinder head flow into the intake silencer and oil is then separated from the
gases in the intake silencer labyrinth. The oil flows from the bottom of the intake silencer into the oil
pan through the blowby hose and the gases are drawn into the carburetor and reburned in the
engine.
1 To intake silencer
2 From cylinder head
3 To oil pan
1-7
General information
1
Ê
2
3
Ë
È Blowby gas
É Engine oil
Ê Cylinder head
Ë Intake silencer
: È
: É
S69M1140
69M3E11