Suzuki Wagon R Manual page 459

6A1-4 ENGINE MECHANICAL
CYLINDER BLOCK
The cylinder block is made of cast aluminum alloy and
has 4 cylinders arranged "In-Line".
A cylindrical cast iron sleeve is installed in each cylin-
der.
CRANKSHAFT AND MAIN
BEARINGS
A monoblock casting crankshaft is supported by 5
main bearings which are of precision insert type. Four
crank pins on the crankshaft are positioned 180_
apart.
PISTONS, RINGS, PISTON PINS AND
CONNECTING RODS
The piston is cast aluminum alloy, and has two com-
pression rings and one oil ring.
Among two compression rings (top and 2nd rings),
the outer surface of the top ring is treated with nitriding
for improvement in abrasion resistance.
The oil ring consists of two rails and one spacer.
The piston pin is offset 0.5 mm towards the major
thrust side.
1. Rocker arm shaft
2. Rocker arm (EX)
3. Intake valve
4. Exhaust valve
IN
5. Rocker arm (IN)
6. Camshaft
7. Clip
8. Pivot
This allows a gradual change in thrust pressure
against the cylinder wall as the piston travels its path.
Pins, made of chromium steel, have a floating fit in the
pistons and in the connecting rods. The connecting
rods are made of forged steel, and the rod bearings
are of precision insert type.
CYLINDER HEAD AND VALVE TRAIN
The cylinder head is made of aluminum casting.
The supporting part of the camshaft is an indepen-
dent cap type. The combustion chamber has 4 valves
and uses the center plug type pent roof shape for
higher intake and exhaust efficiency.
As the intake side rocker arm is end pivot type, it
swings according to the camshaft movement to open
and close the intake valve.
On the other hand, the exhaust side rocker arm is see-
saw type. It swings with the rocker arm shaft as its
supporting point and according to the camshaft
movement to open and close the exhaust valve.
EX