Mechanism And Function; General - Subaru XT 1988 Service Manual

2-3 ENGINE
1 800 cc Engine
MECHANISM AND FUNCTION
General
The SUBARU XT houses a horizontally-opposed 4-cylinder,
4-stroke cycle, liquid cooled OHC gasoline engine. This well-
balanced engine, adopting a horizontally opposed piston
arrangement, is made of an aluminium alloy, and is light
Intake valve
Oil filler duct
Lash adjuster
Valve rocker-
Camshaft
Rocker cover
Camshaft case
Fig. 1
CYLINDER BLOCK
1) The cylinder block, made of an aluminium alloy, is light
weight and provides good heat conduction, and is divided into
two portions, left-side half and right-side half, due to the
adoption of a horizontally opposed piston arrangement.
2) The rotor housing for the oil pump is built into the
cylinder block in order to reduce the total length of the
engine.
3) The cylinder liner is a cast and dry type.
2
weight and compact in construction. This engine also adopts
the OHC (Over-Head Camshaft) system, hydraulic lash ad-
juster, and fuel injection system, attaining easier maintenances
servicing, and reliability as well as low fuel consumption, low
noise and powerful performance.
Lash adjuster
Camshaft
Camshaft case
Exhaust valve
Oil
pan~
Cylinder block
L2-1037
CYLINDER HEAD
1) The cylinder head, made of an aluminium alloy, forms a
part of the bath-tub type combustion chamber which features
higher combustion efficiency.
2) The intake and exhaust ports are laid out so as to
minimize resistance for the intake air and exhaust gases, and
they improve suction and discharge efficiencies.