01-5
Basic Engine
01-5
DESCRIPTION (Continued)
The spark plugs have a tapered seat without a sealing ring.
The result is a closed ventilation system in which the fumes
Engine Ventilation:
from the crankcase pass back via the inlet manifold into the
The ventilation system consists of an oil filler cap with two
cylinders for combustion.
connecting hoses, one of which passes to the inlet
Gas flow is regulated by a calibrated orifice in the oil filler
manifold and the other to the air cleaner.
cap.
A VENTILATION AT IDLE SPEED
AND HALF THROTTLE
B VENTILATION AT FULL THROTTLE
HOSE CONNECTION
TO
AIR C
PRESS IN
ORIFICE
HOSE C
INTAKE MANIFOLD
VACUUM FITTING
Lubrication Circuit:
An eccentric twin-rotor oil pump draws oil via a strainer
from the sump and forces it into the full-flow oil filter.
Oil pressure is regulated by a relief valve inside the pump.
The filtered oil passes through the center of the filter
element, then along a short passage (right hand side of the
engine) to the oil pressure switch and through a transverse
bore to the main oil gallery (left hand side of the engine).
The crankshaft main bearings are fed directly from the
main oil gallery and the camshaft bearings are linked, in
turn for their lubrication with the front, center and rear main
bearings. Each of the rod journals are supplied with oil by
the nearest main bearing through oblique passages.
An oil hole in the connecting rod ensures splash lubrication
of the piston pins and the trailing side of the cylinders.
Timing chain and sprockets are also lubricated via a splash
hole. The camshaft front bearing journal has a machined
groove through which oil is intermittently forced to the
rocker shaft (via passages in cylinder block and cylinder
head).
LUBRICATION CIRCUIT
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